TruSlate® Install Instructions - English
(RESTS112)
Updated: 8/15
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Before • Read these entire instructions thoroughly…
to ensure a problem-free installation.
You
• Use the illustrations and icons… throughout
Start
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Installation
Instructions
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the installation instructions to help guide you
through your installation.
Slope
Limits
• TruSlate® Premium Roofing System… is designed for all
slopes from 4:12 vertical application. Special installation
techniques are required for slopes from 4:12 up to and
including 5:12 (see page 8 for details).
• Do NOT install… on slopes less than 4:12.
Start Every TruSlate® Project With Safety In Mind!
Protect Yourself And Others...
1. ALWAYS… wear appropriate clothing and footwear.
2. Reduce tripping hazards… keep the work areas organized
and clean.
3. Beware of “in-between” roof slopes… a “walkable” roof may not
be walkable once the slate or shingles are stripped off. A slope
of 6:12 and higher generally becomes unsafe after being stripped.
4. Wear safe footwear… soft-soled boots provide the best
roof traction.
5. Roof deck protection provides traction… properly installed
roof deck protection will give safer traction.
6. Store material safely on the roof… OSHA recommends keeping
material at least 6' (1 .83 m) from the eaves and the rake edges to
reduce the chance of falls.
Power Nailer Safety
1. C
heck the operation of the safety… never tie back or disengage
the safety.
2. Operate when in position… only use when the gun is on the
material to be fastened.
3. Do not rest the tool against your body… to eliminate misfires.
4. Always wear safety glasses… to protect from flying objects.
5. Use caution with air power…
• Only use clean, dry compressed air.
•D
isconnect the air supply as soon as you are finished with
the tool.
• Never work on the tool while connected to the air supply.
• Inspect hoses for breaks or leaks.
6. Keep the tool clean and maintained properly… for safety and
long-term use.
7. N
ever point nail guns at people… these tools are not toys and
should not be played with.
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Hammer Safety
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1. Eye protection must be worn.
2. Strike nails squarely… to reduce the chance of nails flying back at you.
3. Discard damaged hammers… with cracked handles or heads.
4. Hammer heads can shatter…
• Never strike a hardened steel hammer against another hardened steel object.
• Never strike hammer face against hammer face.
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Cutting Tool Safety
1. Always cut away from your body… to reduce the chance of cutting yourself.
2. Dull blades are dangerous blades… dull blades have to be forced, increasing the chance
of slipping. Make sure to replace blades frequently.
3. Retract blade on hand-operated cutters when storing… to reduce the chance of
accidental cuts.
Material Handling Should Be Done Easily And Safely...
1. Use your legs… when lifting heavy materials, always use your legs – not your back. Lifting
with your back can cause back injuries.
2. Do not overload yourself… carrying too much fatigues the body and is unsafe on ladders
and rooftops.
3. Boom trucks are dangerous…
• These trucks can easily strike power lines.
• Anyone nearby can be injured or killed by the electric current.
• Keep yourself and your crew away from boom trucks delivering material.
4. Store material close to the roof… the closer to the roof, the less time and energy wasted
retrieving material.
Step 1:
What Materials and Tools Do I Need to
Install the TruSlate® Premium Roofing System?
12" x 12" (305 mm x 305 mm) Field Slates… natural quarried roofing slates used to
cover the primary area of the roof. TruSlate® Field Slates arrive at the job in crates
with enough slates to cover approximately 500 square feet (5.0 squares) (46.45 m2)–
except for Rustic Red, which comes with enough slates to cover approximately 200
square feet (2.0 squares) (18.58 m2).
• There are 120 TruSlate® Field Slates per 100 square feet (1.0 square) (9.29 m2).
16" x 7" (406 mm x 178 mm) Trim Slates… natural quarried slates used on both the
hip and ridge sections of the roof.
• TruSlate® Trim Slates arrive at the job in crates containing enough trim slates to
cover approximately 100 lineal feet (30.48 lm) of hip and ridge.
• There are approximately 250 TruSlate® Trim Slates per 100 lineal feet (30.48 lm).
UnderBlock™ UV & Moisture Barrier… used as an interlayment between the slates,
TruGrip™ Hangers, and roof deck. UnderBlock™ UV & Moisture Barrier provides an
extra layer of protection for your roof. It’s made from ultra-tough high-density
polyethylene. Each roll of UnderBlock™ UV & Moisture Barrier contains enough
material to cover approximately 250 square feet (2.5 squares) (23.23 m2).
TruGrip™ Battens and Hangers… GAF’s exclusive TruGrip™ Battens
and Hangers for installing the TruSlate® Premium Roofing System.
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• TruGrip™ Battens are 4 foot (1 .22 m) stainless steel strips, preassembled with standard
TruGrip™ Hangers at intervals of 6" (152 mm).
• TruGrip™ Hangers are spring-tempered stainless steel and are installed in the TruGrip™
Battens. Hangers are also available in standard/long lengths that can be used to install
slate using a “staggered application method.“
• TruGrip™ Battens and Hangers come in packages with 75 batten strips with pre-installed
hangers plus 20 extra hangers. Each package covers approximately 250 square feet
(2.5 squares) (23.23 m2).
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Lay-Straight™ Alignment Tape… is used as a guide for installing the TruGrip™ Battens
on the roof. This tape contains markings that show the installer where each TruGrip™
Batten should be installed. Lay-Straight™ Alignment Tape is started at the eave and laid
out vertically toward the peak of the roof. Each roll of Lay-Straight™ Alignment Tape is
approximately 180 lineal feet (54.9 lm) and covers approximately 600 square feet
(6 squares) (55.74 m2). Lay-Straight™ Alignment Tape comes with 3 rolls per package.
TruSlate® Ridge Vent… 4' (1 .22 m) hard plastic ridge vent installed at the ridge to provide
proper attic ventilation in conjunction with adequate intake ventilation at the eaves/soffits.
TruSlate® Ridge Vent is a non-baffled ridge vent with a Snow Guard™ Filter to provide
excellent aesthetics while delivering maximum protection.
- TruSlate® Ridge Vent is packaged 10 pieces per box, with enough material to cover
40 lineal feet (12.19 lm) of ridge.
TruSlate® Hip & Ridge Spacer… 1/2" x 8" x 48" (13 mm x 203 mm x 1 .22 m) corrugated
plastic pieces used as a base for installing Trim Slates on the hips and ridges (when ridge
ventilation is not used).
• When TruSlate® Ridge Vent is used, the Hip & Ridge Spacer is NOT used to install
Trim Slates at the ridge.
• E ach pack of TruSlate® Hip & Ridge Spacer covers approximately 100 lineal feet
(30.48 lm) of hip and ridge.
TruSlate® Stainless Steel Nails… 1 1/4" (32 mm), .120 Stainless Steel Annular Ring Shank
Coil Roofing Nails used to install TruGrip™ Battens and Hangers. These stainless steel nails
work with most major brand-name roofing pneumatic nail guns.
• E ach box of TruSlate® Stainless Steel Nails covers approximately 1,500 square feet
(15 squares) (139.4 m2).
16 oz (454 g) copper flashings with copper fasteners are
recommended for the TruSlate® Premium Roofing System.
Flashing Materials
Drip Edge… “D”-style copper edge
metal used at the eave portion of the
roof. 16 oz. (454 g) copper material
should be used.
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Rake Or Gable End Metal… 16 oz. (454 g) copper edge metal with special vertical lip
used at the rake or gable end of the roof.
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Valley Metal… 24" (610 mm) “W” style valley metal, with 1" (25 mm) splash diverter, used
to flash the valley areas of the roof.
• Valley metal should be: 16 oz. (454 g) copper.
Wall and Counter Flashing… metals used to flash wall to roof junctions. 16 oz (454 g)
copper should be used for all wall and counter flashings.
Chimney Flashing... metals used to flash chimney to roof junctions. 16 oz. (454 g) copper should
be used for all chimney flashing areas.
Do NOT use galvanized flashings with the TruSlate® Premium
Roofing System. This can cause corrosion and staining.
Substitutions for Flashing Metals Include:
• 24 gauge [.024 inch-(.61 mm)] thick stainless steel with stainless steel fasteners.
• 16 ounce (454 g) [.026 inch (.66 mm)] thick lead-coated copper with stainless steel fasteners.
• 4 lb. (1 .81kg) [.062 inch (1.57 mm)] thick lead with stainless steel fasteners.
• .016 inch (.41 mm) thick copper-clad stainless steel with stainless steel fasteners.
Contact GAF Technical Services at 1-800-ROOF-411 for further information on
compatible flashing materials.
Fasteners... are used to secure TruSlate® Trim Slates, TruSlate® Hip & Ridge Spacer,
and TruSlate® Ridge Vent.
• Minimum 2" (51mm) stainless steel nails, 2" (51mm) #8 coated decking screws, or
2" (51mm) copper slating nails should be used to secure Trim Slates at the hip and ridge
(when not using ridge ventilation).
• When installing Trim Slates over the TruSlate® Ridge Vent, use minimum 2 1/2" (64 mm)
stainless steel nails, 2 1/2" (64 mm) #8 coated decking screws, or 2 1/2" (64 mm) copper
slating nails for optimum holding power.
• Minimum 1 3/4" (44 mm) roofing nails should be used to install the TruSlate® Ridge Vent.
• Minimum 1 1/2" (38 mm) roofing nails should be used to install the TruSlate® Hip &
Ridge Spacer.
• Minimum 1 1/4" (32 mm) copper slating nails for fastening copper flashing.
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Leak Barriers… Self adhering underlayments, such as GAF WeatherWatch® Leak
Barrier, StormGuard® Leak Barrier, or UnderRoof™ 2 Leak Barrier, are used to protect
vulnerable areas of the roof.
•A
ll leak barriers used with the TruSlate® Premium Roofing System must meet ASTM
D1970 standards.
•V
ulnerable a
reas that leak barriers protect include:
• Eaves
• Chimneys
• Rakes
• Hips and Ridges
• Valleys
• Penetrations (vents, soil pipes, skylights, etc.)
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Roof Deck Protection… commonly known as “underlayment”, such as GAF
Deck-Armor™ Premium Breathable Roof Deck Protection, provides an added layer of
protection for the roof deck under the primary roof covering.
• R oof deck protection is used on the remaining area of the roof deck where leak barriers
are not installed.
•W
hen using synthetic roof deck protection products… they must meet or exceed the
physical properties of ASTM D226 and ASTM D4869.
•W
hen using roofing felts… minimum (2) layers of ASTM D226 Type II (#30) asphalt
saturated roofing felt are required.
•O
n slopes 4:12 - 5:12, where a leak barrier must be used on the full deck, use a product
meeting ASTM D1970, such as GAF UnderRoof™ 2 Leak Barrier.
Important: To achieve UL Class A fire rating with TruSlate®, install GAF’s VersaShield®
Fire-Resistant Roof Deck Protection on top of full-deck leak barrier coverage (4:12 - 5:12
roof slopes) or on top of fastened roof deck protection (roof slopes above 5:12).
Caulk/Sealant… use only high-quality, exterior-grade sealant. Use on various finishing
elements of the TruSlate® Premium Roofing System, such as the joints of Trim Slates
installed at the hip and ridge.
Decking… is the “foundation” for the roofing system. It is the substrate to which all roofing
materials are fastened. Unlike “traditional” slate roofing systems, the TruSlate® Premium
Roofing System can be installed on decking systems that are commonly used for standard
asphaltic shingles.
GAF allows the following decking materials for use with its TruSlate® Premium
Roofing System:
•M
inimum 15/32" (13 mm) APA - The Engineered Wood Association–rated exteriorgrade plywood.
•M
inimum 7/16" (11 mm) APA - The Engineered Wood Association–rated exterior-grade
oriented strandboard, commonly known as “OSB.”
•M
inimum 1" (25 mm) thick by 6" (152 mm) wide boards.
What Tools Do I Need To Install the GAF TruSlate®
Premium Roofing System?
Hand Tools… • Hammer • Tin Snips
• Utility Knife
• Chalk Line
• Tape Measure
Power Tools… • 1/8" (3 mm) masonry drill bits
• Drill
• Pneumatic nail gun for roofing
• Air compressor and hose
• Extension cords
•T ile saw (high-speed wet-type saw or power saw with carbide tip blade)
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Specialty Tools… • Slate cutter (optional) • Forklift or conveyor lift
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Safety Equipment… • Eye protection (adequate safety glasses)
• Hand protection (sturdy work gloves)
• Safety belts and harness
• Ropes and other necessary fall protection
• Hard hats
• Scaffolding and/or ladders
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Safety is the #1 Priority… for the protection of yourself
and your crew. Always follow all safety tips included in this
installation guide, and always follow OSHA requirements
in your area.
Step 2:
How Much Material Do I Need… For My Roof to Install the
TruSlate® Premium Roofing System?
Basic Estimating… to determine approximate product needs.
Important: The measurements below do NOT include an allowance for waste. ADD 10%
TO YOUR CALCULATIONS TO ENSURE THAT YOU HAVE ENOUGH OF EACH MATERIAL
TO FINISH THE JOB.
Step 1... Measure the Area of Each Roof Plane… and add them together to determine
the total area. This is a good starting point to determine how much material is needed for
the job.
Step 2... Measure the Length Of Hip and Ridge Areas… and add them together
to determine the lineal footage of TruSlate® Trim Slates, Hip & Ridge Spacer, and
Ridge Vent required.
Step 3... Purchase TruSlate® Roofing System Products…
• TruSlate® Premium Roofing System:
• TruSlate® 12" x 12" (305 mm x 305 mm) Field Slates… approximately 500 square
feet (5 squares) (46.45 m2) coverage in each crate [with the exception of Rustic Red,
which covers approximately 200 square feet (2 squares) (18.58 m2)].
• TruSlate® System Components:
– UnderBlock™ UV & Moisture Barrier (2.5 squares (23.23 m2) coverage) per roll
– TruGrip™ Battens & Hangers (2.5 squares (23.23 m2) coverage) per box
– Lay-Straight™ Alignment Tape (6.0 squares) (55.74 m2) per roll, 3 rolls per
package.
• TruSlate® Trim Slates Kit:
– TruSlate® 16" x 7" (406 mm x 178 mm) Trim Slates... approximately 100 lineal feet (30.48 lm) of coverage in each crate. Each crate contains enough
Trim Slates and Hip & Ridge Spacer to install 100 lineal feet (30.48 lm) of
Trim Slates on the hip and ridge.
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Step 4... Purchase Additional Materials…
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• TruSlate® Ridge Vent:
• Each box of TruSlate® Ridge Vent covers approximately 40 lineal feet (12.19 lm)
of ridge.
• L eak Barriers… such as GAF WeatherWatch®, StormGuard®, or UnderRoof™ 2 Leak
Barriers. These products generally come in 100, 150, or 200 square feet (1, 1 .5, or 2
squares) (9.29, 13.94, or 18.58 m2) coverage sizes.
- Used on vulnerable areas of the roof such as eaves, valleys, hips and ridges,
rake or gable edges, roof protrusions, and chimneys, etc.
- See Page 8, Step 4, for specific details on installing leak barriers.
• Roof Deck Protection… such as GAF Deck-Armor™ Premium Breathable Roof Deck
Protection. Deck-Armor™ covers approx. 1,000 square feet (10 squares) (92.9 m2).
- Roof deck protection is used on the remaining area of the roof deck where
leak barriers are not installed.
- See Page 8, Step 4, for specific details on installing roof deck protection.
• F lashing Materials… for flashing valleys, eaves, rakes, chimneys, and to use as counter
flashing, etc.
- Examine the roof surface for these areas to ensure that you purchase the right
amount of materials needed to complete the job.
- Only copper or other GAF approved metals should be used.
• Fasteners… such as GAF’s 1 1/4" (32 mm) Stainless Steel Ring Shank Coil Nails for
installing the TruGrip™ Battens & Hangers. Each box of stainless steel coil nails covers
approximately 1,500 square feet (15 squares) (139 m2).
- Purchase fasteners for Trim Slates. Use 2" (51 mm) stainless steel nails, 2" (51mm)
#8 coated decking screws, or 2" (51 mm) copper slating nails for Trim Slates on
the hips and ridges where ridge ventilation is not installed.
- When installing Trim Slates with the TruSlate® Ridge Vent, use 2 1/2" (64 mm)
fasteners, as described above, for maximum holding power on the ridge.
- Purchase minimum 1 1/4" (32 mm) copper slating nails for fastening
copper flashings.
•D
on’t Forget… any other specific materials or tools that may be required on your
specific project.
Step 3:
Prepare the Roof Deck
Always inspect existing roof sheathing… for structural integrity, wet areas, and uneven
areas or areas with holes. Properly fix any such areas as necessary.
Locate and Properly Fix… any penetrations on the roof deck that can damage or
affect the performance of the roof deck protection, leak barriers, or roofing system. All
nails or fasteners should be driven flush with the deck.
The Roof Deck… should always be dry, well-seasoned, and consist of one of the
following:
•M
inimum 15/32" (12 mm) APA - The Engineered Wood Association-rated exterior-grade
plywood.
•M
inimum 7/16" (11 mm) APA - The Engineered Wood Association-rated exterior-grade
oriented strandboard, commonly known as “OSB.”
•M
inimum 1" (25 mm) thick by 6" (152 mm) wide boards.
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When Installing Roof Decking… over spaced sheathing, the plywood or OSB sheathing
must be installed so that joints of the plywood or OSB are located on top of the existing
pieces of spaced sheathing below. This will ensure that the plywood or OSB is properly
supported by the spaced sheathing.
•S
heathing Nails… should be installed 6" (152 mm) on center on the perimeter and
12" (305 mm) on center in the field.
For more information on decking materials and applications, contact GAF Technical Services
at 1-800-ROOF-411.
Step 4: Install Roof Deck Protection & Leak Barriers
When installing the GAF TruSlate® Premium Roofing System, there are two options for
installing Roof Deck Protection.
1. Recommended Method for Slopes Over 5:12. . . Use mechanically attached roof deck
protection, such as GAF Deck-Armor™ Premium Breathable Roof Deck Protection, along
with a self-adhered leak barrier at the vulnerable areas of the roof. These include GAF
WeatherWatch®, StormGuard®, or UnderRoof™ 2 Leak Barriers.
2. Required on Roof Slopes 4:12 Up to and Including 5:12. . .
Use a self-adhered leak barrier, such as GAF UnderRoof™ 2, StormGuard®, or
WeatherWatch® Leak Barriers to cover the full deck.*
Never install the GAF TruSlate® Premium Roofing System on slopes less than 4:12.
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* Proper attic ventilation is critical when covering the full deck with a leak barrier. Follow
all recommendations in GAF’s Steep-Slope Technical Point, Full-Deck Coverage Of Leak
Barriers (TAB-R-2011-111) when using full-deck coverage of UnderRoof™ 2, StormGuard®, or
WeatherWatch® Leak Barriers.
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• To install roof deck protection and leak barriers, follow published application
instructions on products packaging or at gaf.com.
Roof Slopes greater than 5:12 …
Self-Adhered Leak Barriers with Mechanically Attached Roof Deck Protection
Apply Self-Adhering Leak Barriers… on roof slopes above 5:12, such as GAF
WeatherWatch®, StormGuard®, or UnderRoof™ 2 Leak Barriers, in valleys, eaves, hips
and ridges, gable/rake edges, around roof protrusions, and at all other vulnerable areas
of the roof.
• At the Eaves…
• Install Drip Edge Metal… at the eave edge of the roof (16oz. [454 g] copper).
• Fasten Drip Edge Metal... every 8" – 10" (203 mm–254 mm) on center, 1" (25 mm)
from the edge of the metal with 1 /" (32 mm) copper slating nails.
• Install Leak Barrier over the Deck… extending from the eave edge to a point at
least 24" (610 mm) beyond the inside “warm” wall of the living space below.
• L eak Barrier… should extend over the drip edge metal at the eave edge.
• Consult Local Building Codes… to find specific requirements for installing leak
barrier at the eave. Remember, codes may vary from region to region.
1
4
3’ (.91
6" (152 mm)
End Lap
3" (76 mm)
Side Lap
Along eaves, put Deck-Armor™
Roof Deck Protection on top
of metal drip edge
Along rake, place
drip edge on top
of Deck-Armor™
Roof Deck Protection
Deck
(Use WeatherWatch® or
StormGuard® Leak Barrier
If Required)
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2. Install Mechanically Attached Roof Deck Protection… at the eave area of the valley
over the leak barrier.
3. Install Valley Metal… over self-adhered leak barrier and mechanically attached roof
deck protection using “W”-style 16 oz. (454 g) copper valley flashing.
•V
alley flashing should have 1" (25 mm) splash diverter.
• F asten… valley flashing with 1 1/4" (32 mm) copper slating nails at 16" (406 mm)
on center, 1" (25 mm) in from the edge of valley flashing.
Standard Valley Metal Detail
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"
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• In the Valley…
1. Install Self-Adhering Leak Barrier… in the valley, making sure the sheet is centered in
the valley area.
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Alternate Valley Metal Detail #1
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Alternate Valley Metal Detail #2
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4. Apply Additional Layer of Leak Barrier… over valley metal, leaving 3" (76 mm) from
center line of valley uncovered.
•C
over valley flashing… a minimum of 11" (279 mm) on each side with leak barrier.
•C
over all nails… with a minimum of 3" (76 mm) of leak barrier.
•A
t the Rake Edge…
1. Install Mechanically Attached Roof Deck Protection… 6"–8" (152 – 203 mm) short of
the rake edge, leaving the deck uncovered.
2. Install Self-Adhered Leak Barrier… along the entire rake edge of the roof, overlapping
the leak barrier onto the adjacent roof deck protection.
• T his will help to protect against weather infiltration at the rake edge.
3. Fasten Rake Edge Metal… over leak barrier 8"–10" (203 mm–254 mm) on center,
1" (25 mm) from the edge of the metal with 1 1/4" (32 mm) copper slating nails.
•U
se 16 oz. (454 g) copper edge metal for rake edge metal.
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Important: Standard profile rake edge metal (copper or other TruSlate®-approved
metals) can only be used when installing vertical battens at the rake edge.
See Page 27 for further details.
4. Cover Nail Heads… on the gable/rake edge metal with 10" (254 mm) wide strips of
leak barrier.
• Leave 1 1/2" (38 mm) wide of rake edge metal uncovered by leak barrier to form
a gutter.
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Important: Always make sure that self-adhering leak barrier extends a minimum of
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6" (152 mm) beyond metal over roof deck protection and all other flashings/penetrations.
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• At the Ridge…
1. Install… an 18" (457 mm) wide piece of self-adhered leak barrier at the ridge.
2. Extend… the leak barrier down 18" (457 mm) from the roof peak or ridge vent slot
towards the roof deck, overlapping the roof deck protection for maximum protection
against weather infiltration.
3. If Ridge Ventilation Is Used… make sure the leak barrier does not cover the ridge slot.
Mechanically Attached Roof Deck Protection… such as GAF Deck-Armor™ Premium
Breathable Roof Deck Protection must be installed on the remainder of the roof surface not
covered by self-adhered leak barrier:
•W
ith a minimum 3" (76 mm) overlap and minimum 6" (152 mm) end lap. In wet or harsh
winter climates, use a minimum 6" (152 mm) overlap and a 12" (305 mm) end lap.
• F asten all side and end laps… 12" (305 mm) on center. In high wind areas, fasten
6" (152 mm) on center.
• F asten in the field… with 2 staggered rows 24" (610 mm) on center. In high wind areas,
fasten 12" (305 mm) on center.
•U
se only cap nails or cap staples to fasten Deck-Armor™ Roof Deck Protection. Do NOT
use nails or staples without caps.
• For further information…. on installing Deck-Armor™ Roof Deck Protection or other roof
deck protection products, consult the published application instructions on product
packaging or at gaf.com.
Important: Deck-Armor™ Premium Breathable Roof Deck Protection is water resistant;
it is NOT waterproof. It should NOT be utilized as a temporary roof to protect property
or possessions.
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18" (457 mm) Leak Barrier
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For Roof Slopes at least 4:12 up to and Including 5:12…
Self-Adhered Leak Barriers… Full-Deck Coverage
Never Install… the TruSlate® Premium Roofing System on roof slopes less than 4:12.
Full Deck Coverage… of a self-adhering leak barrier is required for roof slopes equaling
4:12 up to and including 5:12.
•W
hen used in full-deck coverage, a leak barrier such as GAF’s UnderRoof™ 2 Leak
Barrier will help to prevent possible weather infiltration on these types of low-slope roofs.
•D
o not use mechanically attached roof deck protection… since the leak barrier will
be applied over the entire surface of the roof deck.
•S
ince leak barriers used on full-deck coverage act as a vapor barrier, proper
attic ventilation is critical.
•C
onsult local building codes for requirements on ventilation.
Step 5:
Install TruSlate® Ridge Vent
GAF Recommends… following the FHA/HUD requirements for proper ventilation.
However, you should always comply with local building codes. Review your local
building codes for other ventilation requirements.
FHA/HUD Guidelines Require:
•O
pen Soffits and Open Ridge Vents… the FHA/HUD requirements for this type of
ventilation are based on air flow through both open soffits and ridges.
•A
Balanced System… equal airflow through the soffit and through the ridge.
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Important Considerations
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• Install the TruSlate Ridge Vent before installing the Field Slates to ensure that a full
course of slate can be installed adjacent to the Ridge Vent and for proper roof layout.
• Do not install the TruSlate® Ridge Vent along hip areas (down-slope hip rafters or hip
legs)… since it can leak if installed on hips.
• For a uniform appearance, install the TruSlate® Ridge Vent over the entire length of the
ridge. The vent MUST extend past the slot opening by at least 6" (152 mm).
• For applications with hip and ridge intersections, terminate the TruSlate® Ridge Vent
at least 6" (152 mm) short of the intersection.
• When venting vaulted or cathedral ceilings, each joist/rafter must be ventilated on
both ends and have at least a 2" (51 mm) clearance.
Cutting the Ridge Slot Opening…
1. Calculate the Total Length of TruSlate® Ridge Vent Needed… to determine the
necessary slot opening required.
2. Roofs Without a Ridge Board… cut a 7/8" (22 mm) opening along the ridge on
each side.
3. Roofs With a Ridge Board… cut a 1 5/8" (41 mm) opening along the ridge on
each side.
" (22 mm)
" (22 mm)
" (44 mm)
With Ridge Board
Note: The total maximum slot opening is 3 1/4" (83 mm) wide.
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(152 mm)
(305 mm)
(305 mm)
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4. Mark-off and Cut the Slot Opening… making sure the slot is cut straight and consistent.
• Avoid cutting through rafters when cutting the ridge slot opening.
5. Stop… cutting the ridge slot opening at least 6" (152 mm) from end walls.
• The opening must stop at least 12" (305 mm) from hip and ridge intersections
or chimneys.
(152 mm)
6. Where
Short Ridges (dormers, ridge intersections) are Present… mark and cut the slot
and ensure that the end of the opening stops at least 12" (305 mm) from the ridge intersection.
(152 mm) (152 mm)
At hip-to-ridge intersections, make sure the ridge slot opening is kept back at least
12" (305 mm) and the Ridge Vent is kept back at least 6" (152 mm) from the hip-to-ridge
intersection.
• Hip & Ridge Spacers running up the hips must continue up to the ridge.
• Ridge Trim Slates must cover hip Trim Slates for proper weather protection.
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(152 mm)
(152 mm)
(152 mm)
(305 mm)
7. Install an 18" (457 mm) Piece of Self-Adhered Leak Barrier… such as GAF
WeatherWatch® or StormGuard® Leak Barriers from the edge of the ridge slot
opening down towards the roof deck.
• This will help to ensure maximum protection against weather infiltration.
Install the Ridge Vent…
1. Starting At One Gable End… place and center the TruSlate® Ridge Vent over the ridge
slot. Rest the vent firmly against the roof surface.
• T he ridge vent must always be “peaked” and centered over the ridge slot.
Vent off-center
over ridge slot
Vent “peaked” and centered
over ridge slot
Ridge Slot
Center line
Ridge Slot
Center line
The top panel on each side of the Ridge Vent must be parallel to the roof deck
below to avoid problems when installing Trim Slates.
2. Fasten the Vent Section… using roofing nails that are 1 3/4" (44 mm) or longer.
•A
ttach the vent section using the nail line inscribed at the top of the vent as
a guide.
•N
ails must always penetrate through plywood decks at least 3/4" (19 mm) into
wood planks.
• Use 3" (76 mm) ring shank nails for maximum uplift resistance.
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3. Apply the Subsequent Ridge Vent Sections… along the length of the ridge.
• For cold weather applications… leave 1/8" (3 mm) gap between each vent
section to allow for expansion and contraction.
Deck-Armor™
Roof Deck Protection
18"
(457mm
)
(4
18
57
"
mm
)
WeatherWatch® or
StormGuard® Leak Barrier
4. Install a 4" (102 mm) Wide Strip of Self-Adhered Underlayment… such as
WeatherWatch® or StormGuard® Leak Barrier, over the seams between each
Ridge Vent section.
• This will ensure maximum protection against weather infiltration.
Important: To ensure maximum protection against weather infiltration…
use exterior-grade silicone caulk to cover all exposed nail heads on the vent.
5. Install the Final Section of TruSlate® Ridge Vent… at the end of the ridge, with the
finished premolded end cap installed to the outside edge to prevent weather infiltration.
Install Top Course of Field Slates…
1. The Underblock™ UV & Moisture Barrier… will extend 3/4" (19 mm) from the top course
of slates.
2. Tuck 3/4" (19 mm) Portion… of UnderBlock™ UV & Moisture Barrier securely under the
TruSlate® Ridge Vent to ensure weathertight protection at the juncture of the slates and
Ridge Vent.
3. B
utt The Top Course of Slate… up firmly against the Ridge Vent.
• There should be no space between the top of the slates and the Ridge Vent.
Important: It may be necessary to adjust the lower courses of Battens and Hangers
1/4" (6 mm) up or down as necessary in order to install a full course of slates adjacent to
the Ridge Vent.
Install Trim Slates Over Ridge Vent…
1. Install Trim Slates… directly to the vent, using minimum 2 1/2" (64 mm) stainless steel
nails, copper slating nails, or coated decking screws.
• GAF TruSlate® Trim Slates come with prepunched holes for easy installation.
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TruSlate® Trim Slate
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Top course of
TruSlate® Field Slate
• Note: Nails must be of sufficient length to penetrate through plywood decks or
OSB and at least 3/4" (19 mm) into wood planks.
• Use 3" (76 mm) ring shank nails for increased uplift resistance.
2. The Edge of Each Trim Slate… must meet the top of the ridge with one piece slightly
overlapping the other to form a clean, water-resistant joint.
3. Each Succeeding Trim Slate… should overlap the previous piece by 6" (152 mm),
resulting in a finished exposure of 10" (254 mm).
• Do NOT overdrive the fasteners on the Trim Slates. The Trim Slates should be
able to “wiggle” slightly.
4. If Desired… apply a weatherproof caulk of a color matching the slate to the butt joint
of each Trim Slate.
10"
(257 mm)
Step 6:
Install Ridge Trim Slates
(For Installations Without Ridge Vents)
1. Install TruSlate® Hip & Ridge Spacers… evenly over the ridge.
2. Fasten… The Hip & Ridge Spacer at 24" (610 mm) on center along each side of the
ridge with 1 1/2" (38 mm) roofing nails or 1 1/2" (38 mm) coated decking screws.
3. Place a Piece of UnderBlock™ UV & Moisture Barrier. . . over the top of the Hip &
Ridge Spacers.
• Center the UnderBlock™ UV & Moisture Barrier over the Hip & Ridge Spacers.
• Overlap end laps of the UnderBlock™ UV & Moisture Barrier by at least
12" (305 mm).
• Use 10'–12' (3.05 – 3.66 m) lengths of UnderBlock™ UV & Moisture Barrier for
more manageable installations and to avoid issues with expansion and contraction
after installation.
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4. Prepare to Install Top Course Of Field Slates… adjacent to the Hip & Ridge Spacer at
the ridge.
• Apply TruGrip™ Battens and Hangers for the top course of Field Slates.
• Lay 10'–12' (3.05 – 3.66 m) lengths of UnderBlock™ UV & Moisture Barrier along
the row of Hangers, overlapping side laps at least 12" (305 mm).
• Tuck the piece of UnderBlock™ UV & Moisture Barrier previously installed in the top
row of Hangers under the UnderBlock™ UV & Moisture Barrier that was
installed over the Hip & Ridge Spacer.
• The UnderBlock™ UV & Moisture Barrier used on top of the Hip & Ridge Spacer
should always overlap the top course of slate by at least 2" (51 mm).
5. Lay Top Course… of slate by placing bottom edge of each slate into top row of
TruGrip™ Hangers.
• The top edge of the slates should be no more than 1" (25 mm) from the Hip &
Ridge Spacer.
6. Adjust Hangers… as needed, using the spring-loaded TruGrip™ Battens & Hangers.
• TruGrip™ Hangers are pre-installed at 6" (152 mm) on center. Evenly space the
Hangers under each slate.
• On smaller pieces of slate, ensure that two Hangers are supporting each
piece evenly.
• Each Hanger should be 3" (76 mm) from the edge of each full piece of slate.
• Never install pieces of slate less than 4" (102 mm) in width and 5" (127 mm)
in height.
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Important: If the measurement would otherwise cause a piece of slate to be used that
is less than 4" (102 mm) wide, the adjacent pieces of slate must be cut back so that no piece
of slate is less than 4" (102 mm) wide and 5" (127 mm) in height.
• The cut edges should be placed side by side so that these edges blend in and are
not distinguishable.
7. Install Trim Slates… on top of the Hip & Ridge Spacer using two pre-drilled holes in the
Trim Slates.
8. Fasten the Trim Slates… using 2" (51mm) stainless steel nails, 2" (51mm) #8 coated decking screws, or 2" (51mm) copper slating nails into the Hip & Ridge Spacer below.
9. The Edge of Each Trim Slate… must meet at the top of the ridge and one piece should
slightly overlap the other, so a clean weather-resistant joint is formed.
• If desired, apply an exterior weatherproof caulk matching the slate at the butt joint
between Trim Slates.
10. Each Succeeding Trim Slate… should overlap the previous piece by 6" (152 mm),
resulting in a finished exposure of 10" (254 mm).
• Each Trim Slate should overlap the top course of Field Slate by a minimum of
2" (51mm).
• Do NOT overdrive the fasteners on the Trim Slates. The Trim Slates should be able
to “wiggle” slightly.
• Carefully trim any visible UnderBlock™ UV & Moisture Barrier with a utility knife.
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Step 7:
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TruSlate® Non-Vented Ridge
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Lay Out the Roof
Lay-Straight™ Alignment Tape… is part of the TruSlate® Premium Roofing System.
•S
elf-Adhesive… green tape that shows eave alignment and TruGrip™ Batten placement.
• P rovides… a quick-and-easy way to lay out each course of TruSlate® slates on the roof.
Using Alignment Tape…
1. A
lign the Tape… at the eave, using the eave edge mark on the tape.
2. Apply the Tape… all the way up the roof.
3. Repeat… as needed to reach the Ridge Spacer or Ridge Vent.
4. Chalk a Line… on each Batten marker, horizontally across the roof.
5. Install the Battens… from the top of the roof, working down in
4-course increments.
Important: Do not install all the Battens on the roof at once. Instead, install only
4 courses of Battens at a time. This will help to prevent any potential mistakes in laying
out the roof.
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Install TruSlate® Field Slate
General Considerations… The TruSlate® Premium Roofing
System is installed
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Step 8:
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from the top of the roof down to the bottom of the roof. TruGrip Battens and Hangers are
installed in 4-course sections starting at the top of the roof. Within the 4-course section,
slates are slid into place working from bottom to top. After all the slate has been installed
within the initial 4-course section, another 4-course section of TruGrip™ Battens and Hangers
are installed below. This process continues until the installer reaches the bottom of
the roof.
Important: Since the TruSlate® Premium Roofing System is installed from the top of the
roof down, slide guards (toe boards) can be removed as the roof is installed. Before the
UnderBlock™ UV & Moisture Barrier and the TruSlate® Premium Roofing System are installed,
any fastener holes in the roof deck protection or leak barrier must be sealed with a dab
of asphalt plastic roof cement. Any larger holes or tears should be repaired by inserting a
new piece of roof deck protection or leak barrier over the damaged area. The repair piece
should be lapped into the system so that any water running down the roof would run over
the lap and not under the repair piece.
Important Note! Always pull and mix slates from ALL crates on the job site
BEFORE installation to avoid patching or patterning on the roof. Be sure to cull any
slates with severe surface defects of white surface efflorescence (also referred to as
“milk spotting”) before installation on the roof.
Installing TruGrip™ Battens & Hangers…
1. Starting at the Fourth Chalk Line Down… from the ridge, install 4 courses of TruGrip™
Battens on the roof. Battens should lie horizontally at a 90° angle to the Lay-Straight™
Alignment Tape. Install each Batten course approx. 10" (254 mm) apart vertically
(bottom edge of Batten to bottom edge of Batten).
*Required for maximum wind warranties
2. Fasten Each Batten… with 1 1/4" (32 mm) stainless steel annular ring shank coil nails at
the center of each Hanger (approx. every 6" [152 mm]).
• Hangers should line up vertically from course to course. Do not off-set the
Hangers when installing subsequent courses.
• Battens should be fastened end to end.
• Always keep TruGrip™ Battens 1/2" (13 mm) away from Hip & Ridge Spacers or
rake edge metals.
A
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Common Installation Mistake… Installing ™TruGrip™ Battens on the whole roof
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at once. GAF recommends that only 4 courses of TruGrip Battens and Hangers be installed
at a time to ensure that Hangers are aligned vertically from course to course.
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3. TruGrip™ Hangers… can be relocated on the TruGrip™ Batten, as needed, by simply
squeezing the top wires of the Hangers together and releasing. Hangers should “snap”
securely into place.
General Tip: TruGrip™ Battens can be cut, if needed, with tin snips.
For Maximum Wind Resistance* and in areas that receive more than 2" (51 mm) of snow/
year… Use min. 1 1/4" (32 mm) stainless steel annular ring shank nails with 3/8" (10 mm)
head diameter, spaced max. 6" (152 mm) on center through the batten, to fasten the TruGrip™
Batten to the deck. Locate the nail in the Batten, as shown, so that the nail head overlaps the
TruGrip™ Hanger against the Batten slot. This will trap the wire in the Batten slot to provide
maximum resistance to high wind and snow loads.
*Required for maximum wind warranties
TRUSLATE® 1 14" (32 mm) STAINLESS
STEEL ANNULAR RING SHANK COIL NAILS LOCKING
HANGERS IN BATTEN SLATS
BATTEN
HANGER
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Installing UnderBlock™ UV & Moisture Barrier…
1. Cut… a piece of UnderBlock™ UV & Moisture Barrier and place it along the bottom
course of TruGrip™ Battens using Hangers to support the bottom edge of the UnderBlock™
UV & Moisture Barrier. Use 10'–12' (3.05 – 3.66 m) sections of UnderBlock™ UV
& Moisture Barrier for easier installations and to avoid issues with expansion and
contraction after installation.
• UnderBlock™ UV & Moisture Barrier should have side laps of at least
12" (305 mm).
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Common Installation Mistake… Installing
UnderBlock™ UV & Moisture
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Barrier in lengths longer than 12' (3.66 m). UnderBlock UV & Moisture Barrier can
expand and contract with changes in temperature. Longer lengths of UnderBlock™ UV &
Moisture Barrier are more susceptible to this expansion and contraction. Working with
10'–12' (3.05 – 3.66 m) lengths will help you avoid drastic expansion and contraction issues.
2. Always Install UnderBlock™ UV & Moisture Barrier… “Dull” side up (“shiny” side down).
Never nail through the UnderBlock™ UV & Moisture Barrier when installing Field Slates.
Holes in the UnderBlock™ UV & Moisture Barrier could allow water to infiltrate the
roofing system.
Each section of 4-batten courses is referred to below as a “Work Section.”
Important Note! Field Slates must always be at least 4" (102 mm) wide and at least
5" (127 mm) tall.
Installing Slates…
1. W
ork Bottom to Top in Each Work Section… begin on the left side of the roof by
placing a full slate in the bottom course of the first work section. Install each slate over
the UnderBlock™ UV & Moisture Barrier and into the TruGrip™ Hangers.
• At the rake edge, butt slates tightly against the vertical lip of the rake edge metal.
• Working horizontally, proceed across the course, hanging the slates in the
TruGrip™ Hangers.
2. Each Slate… should have a minimum of 2 Hangers supporting the top and bottom of
the slate.
3. Start the Second Course at the Left Side of the Roof . . . working bottom to top in
each section with half a slate to ensure no vertical joints extend through more than
one course. Continue working horizontally across the course, placing slates into
the Hangers.
• Half slates must have at least 2 TruGrip™ Hangers supporting them. Otherwise, half
slates may come loose and fall off the roof.
• Each Field Slate must have a TruGrip™ Hanger located 3" (76 mm) from each side
of the slate.
• Field Slates should be built firmly together. There should be no space between
slates.
General Tip… Cut slates in half by using a high-speed wet-type saw, power saw with
carbide tip blade, or guillotine-style slate cutter.
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4. Offset… the keyways or joints one half-slate from course to course to prevent vertical
keyways or joints from lining up on adjacent vertical courses.
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General Tip… If needed, bend the end of each
TruGrip™ Hanger with a pair of
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pliers so that it grips in the slate tightly. The TruGrip Hanger should resemble a “U” to
hold the slate securely.
5. After Completing… the initial work section, install the next 4 courses of TruGrip™
Battens below.
6. Work Bottom to Top… on the new work section. Install UnderBlock™ UV & Moisture
Barrier and TruSlate® Field Slates as described previously.
7. At The Top of Each Work Section… an “open” course will be created.
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Completing the “Open Course”…
1. Install UnderBlock™ UV & Moisture Barrier… into the “open” course by slipping it under
the top course of slate. The bottom edge of the UnderBlock™ UV & Moisture Barrier will be
held in place by Hangers.
2. Install Field Slates… into the “open” course by slipping the top edge under the first
course until the bottom of the edge of the slate clears the Hangers below.
3. Pull or Push… the Field Slate downward slightly, until the Hangers support the bottom
edge of the slate.
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General Tip: An 18" (457 mm) wide piece of UnderBlock™ UV & Moisture
Barrier can be used as a “shoehorn” by inserting it first, allowing the slates to slide easily
under the “shoehorn” into place. Remove the “shoehorn” and repeat as needed.
For Maximum Wind Resistance*… Be sure that the Field Slate does not overhang the eave
edge. The bottom edge of the Field Slate should rest flush to the eave edge.
*Required for maximum wind warranties.
(Alternate Method)
Installing Slates at Rake Edge Using Vertical Battens
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Installing TruGrip™ Battens vertically, parallel to the rake or gable edge of the roof, is
permitted to fasten rake edge slates (in lieu of using the standard TruSlate® rake metal
with vertical lip). A vertical course of TruGrip™ Battens and Hangers will lock the rake
edge slates in from the side. As always, the horizontal course of Battens and Hangers will
lock the rake slates in from the bottom.
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1. The Rake Edge is Prepared… in the standard TruSlate® manner – with roof deck
protection, leak barrier, rake metal, and a 10" (254 mm) strip of leak barrier to seal rake
metal fasteners.
2. Install Rake Metal… on top of the leak barrier. Unlike the standard TruSlate® rake
metal profile, this rake metal must not have the 3/4" (19 mm) vertical lip or 1/4" (6.4 mm)
hump.
• T he rake edge metal and fasteners must be of a TruSlate® System-approved metal
flashing material to avoid staining and corrosion.
3. Cover Rake Metal Fasteners… with a 10" (254 mm) strip of leak barrier.
4. Before Installing the Last Horizontal TruGrip™ Batten… in each course nearest the
rake edge, chalk a line 5" (127 mm) in from the rake edge of the roof.
• The chalk line will run vertically up the roof, parallel to the rake edge.
5. Align TruGrip™ Battens Vertically… parallel to the chalk line, with the top edge of the Batten resting on the chalk line.
6. Fasten the Vertical Battens… with TruSlate® Stainless Steel Coil Nails.
• T wo Hangers from the vertical Batten and Hanger must support the side of each rake
edge slate.
7. Proceed…with completing horizontal courses of Battens.
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Installing Hips and Valleys
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Step 9:
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Installing Trim Slates on the Hips… Trim Slates are installed in the hips from the
bottom up.
1. Install… TruSlate® Hip & Ridge Spacers along the hip, working from bottom to top.
2. A
t Hip-to-Ridge Intersections… complete the ridge first, allowing for Trim Slates at the
ridge to be installed over the Trim Slates at the hip.
• This will provide a proper tie-in.
Note: A n entire ridge of Trim Slate may need to be installed after one of the slopes
is completed.
3. Fasten… The Hip & Ridge Spacer at 24" (610 mm) on center along each side of the hip
with 1 1/2" (38 mm) roofing nails or 1 1/2" (38 mm) coated decking screws.
4. Place a Piece of UnderBlock™ UV & Moisture Barrier… over the top of the Hip & Ridge
Spacers.
• Center the UnderBlock™ UV & Moisture Barrier over the Hip & Ridge Spacers.
• Overlap end joints of the UnderBlock™ UV & Moisture Barrier by a minimum of 12"
(305 mm).
• Work with 10'–12' (3.05 – 3.66 m) lengths of UnderBlock™ UV & Moisture
Barrier for more manageable installations and to avoid expansion and
contraction issues after installation.
5. Attach Trim Slates… through two predrilled holes using 2" (51 mm) stainless steel nails,
2" (51 mm) #8 coated decking screws, or 2" (51 mm) copper slating nails directly into the
Hip & Ridge Spacer. Do not overdrive the fasteners. Trim Slates should be able to
“wiggle” slightly.
6. The Edge of Each Trim Slate… must meet at the top of the ridge and one piece should
slightly overlap the other, so a clean weather-resistant joint is formed. Trim Slates should
overlap the Field Slate by a minimum of 2" (51 mm).
• If desired, cover each fastener hole and butt joint between Trim Slates with an
exterior-grade weatherproof caulk matching the color of the slate.
7. Subsequent Trim Slates… should overlap the previous Trim Slates by 6" (152 mm).
8. Carefully Trim… any visible UnderBlock™ UV & Moisture Barrier with a utility knife.
Installing Field Slates at the Hip…
Installation Tip: Field Slates can be applied from the middle of the field to the hip.
Depending on the roof layout, it may be necessary to begin roofing from the hip out
towards the field. This can help avoid installing slate pieces that are less than the
minimum 4" (102 mm).
1. Cut Field Slates. . . are required for hip applications. Cut adjacent Field Slates as
necessary to avoid installing slates smaller than the minimum 4" (102 mm).
2. Start the Field Slate . . . on one roof slope adjacent to the hip BEFORE installing the Trim
Slate. Then complete the Field Slate on the opposite roof slope.
• This will eliminate the need to “shoehorn” the Field Slate underneath Trim Slate on
both roof slopes.
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3. Attach Field Slates… into the hip using one of the following methods:
a. Drill a hole in the slate and fasten with the same fasteners used to install
Trim Slates.
b. D
rill a hole and use copper wire to fasten it to the adjacent slate.
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Installing Valleys with TruSlate®…
Field Slates can be installed toward or away from the valley, depending on the roof layout.
It may be easier, in most cases, to begin in the valley and work out to the hip or rake areas of
the roof. This will allow you to avoid installing small pieces of the Field Slate in the valleys.
Closed Valleys…
1. Fit Field Slates… in the space adjacent to valley center line.
2. Mark and Cut… Field Slate to fit, using cutting tools described previously.
3. Attach Field Slates… at the valley using one of the following methods:
a. Drill a hole in the slate and fasten with the same fasteners used to install
Trim Slates.
b. Drill a hole and use copper wire to fasten it to the adjacent slate.
c. Lock the Field Slates against the center “ridge” of the valley flashing.
See detail drawing on Page 30.
Important: Two Hangers must always be used to support each piece of slate installed
into the valley. Closed valleys can also be installed using vertical Battens. See pages 30 and
31 for more information on installing valley slates with vertical Battens.
General Tip: When installing slates into the valley, it may be necessary to cut the
adjacent slates to avoid installing slates smaller than the 4" (102 mm) minimum.
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Closed Valleys
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All Open Valleys (also allowed on Closed Valleys)
Install Slates in the Valley using Vertical Battens…
1. Prepare the Valley… as previously described with “W”-style metal flashings.
2. Before Hanging the Last Horizontal Batten… chalk a line parallel to the valley center line at
least 3" (76 mm) (open valleys) or 1" (25 mm) (closed valleys) out from the valley center line.
The chalk line will mark where the Field Slates should be cut to form the valley.
3. Measure 5" (127 mm) Out on to the Roof Plane… (parallel to the valley center line) from the
previously chalked line and chalk a second line.
4. Apply a Row of Battens Vertically… with the top of the Batten on the second chalk line. The
Hangers on the vertical Batten should extend into the valley to the first chalk line.
5. Continue Installing the Horizontal Field Battens… during the installation of the slope,
extending them over the vertical valley Battens. They should be just short of the first chalked
line. There must be 2 Hangers, on the bottom and sides of the slates.
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Closed Valley with Vertical Battens
Open Valley with Vertical Battens
ROOF DECK PROTECTION
VERTICAL
HANGER
AND
BATTEN
11"
(279 MM)
STRIP
OF LEAK
BARRIER
LEAK BARRIER
ROOF DECK PROTECTION
VERTICAL
HANGER
AND
BATTEN
11"
(279 MM)
STRIP
OF LEAK
BARRIER
LEAK BARRIER
EXPOSED
VALLEY
METAL
UNDERBLOCK™
UV &
MOISTURE
BARRIER
UNDERBLOCK™
UV &
MOISTURE
BARRIER
TRUSLATE®
FIELD SLATES
5"
(127 mm)
1"
1"
5"
5"
(127 mm)
2ND CHALK LINE 5"
(127 MM) OUT FROM
1ST CHALK LINE
3"
3"
5"
(127 mm) (76 mm) (76 mm) (127 mm)
(25 mm)
1st CHALK LINE 1" (25 MM)
MIN OUT FROM CENTER
TRUSLATE®
FIELD SLATES
EAVE DRIP
EDGE METAL
HORIZONTAL
HANGERS AND
BATTENS
1st CHALK LINE 3" (76 mm)
MIN OUT FROM CENTER
2ND CHALK LINE 5" (127 mm)
OUT FROM 1ST CHALK LINE
EAVE DRIP
EDGE METAL
HORIZONTAL
HANGERS AND
BATTENS
Important: Always ensure both side and bottom edges of valley slates
are supported properly to prevent slates from becoming loose or dislodged.
Step 10: Installing Flashing (at side walls, chimney, and other roof penetrations)
Flashing at Side Walls...
Use step flashing that is equal to the 12" (305 mm) length of the Field Slate with an 10"
(254 mm) width. This will allow a minimum of 5" (127 mm) step flashing headlap over each
underlying slate and a 5" (127 mm) extension up the vertical surface.
• 16 oz. (454 g) copper should be used for flashings.
1. Apply The Flashing… under the Battens on the top course and over the slate on the
course below.
2. Extend the Leak Barrier… up the vertical wall a minimum of 5" (127 mm), while
extending the UnderBlock™ UV & Moisture Barrier a minimum of 2" (51mm) up the
vertical wall.
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IMPORTANT: Pay special attention to the last (bottom) step flashing where an
eave intersects a continuous vertical surface to ensure water is diverted outside of the
wall covering.
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3. Install Metal Counter Flashing… mounted to the vertical wall along the top edge of
the
step flashing.
You MUST install counter flashing to cover and protect the top edge of all flashings.
In many cases, the wall covering or cladding material will perform this counter flashing
function. In situations where this does not occur, install a metal counter flashing as shown
in #3 above. The type and thickness of the counter flashing should, at minimum, match
the metal used for step flashing.
Flashing at Chimney…
Slopes that intersect a chimney require either a cricket or “backer” flashing. Flashing on the
upside slope of the chimney should correspond with the recommendations of the
National Roofing Contractors Association guidelines.
• Install step flashing as described in the previous section on flashing side walls
at the side of all chimneys.
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Penetration Flashings…
Numerous small penetrations may need to be flashed within the plane of the roof. These
may include plumbing soil stacks, vents, exhaust vents, furnace or water heater flue pipes,
and electrical stand pipes.
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1. Use a Flat Flange… that extends around the penetration and is installed under the slate and
underlayment on the up side of the slope. The flange should extend down on the top of the
slate on the down slope side of the flange. The flange must be comprised of copper or other
TruSlate® System-approved metals.
2. Notch the UnderBlock™ UV & Moisture Barrier… as shown in the illustration below.
3. Attach a Cylinder, Rectangular Box, or Neoprene Gasket… and seal it to the flange to seal
around the penetration.
4. Use Roofing Sealant… to seal the flange for maximum protection or as required by
building codes.
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Step 11:
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Maintenance: How to maintain the TruSlate® Premium Roofing System
after installation.
Preventative Care
After installation of the TruSlate® Premium Roofing System, keep traffic off the roof surface
as much as possible. If maintenance workers or any other traffic must take place on the
slate roof surface, fasten ladders over the ridge; workers should use the ladders to keep
off the slate surface. As always, follow OSHA guidelines for safety and equipment when
performing any work on the roof surface.
If anyone must walk on the slate roof surface, comply with the following precautions…
• Wear soft-soled shoes.
• Equally distribute body weight on the middle of each slate, being careful to stay
off the corners or edges of Field Slates.
• Follow all applicable OSHA safety recommendations.
Roof Inspection
For years of exceptional beauty and maximum performance, inspect the complete
TruSlate® Premium Roofing System annually and after extreme weather conditions.
Perform visual inspections from the ground whenever possible, both for personal safety
and to limit potential damage to the slate roofing surface.
During this inspection, look for the following…
• Broken or cracked slates
• Crooked or misaligned slates
• Damaged flashings
• Clogged or damaged gutter and leader systems
Concentrate on the following areas of the roof surface during the visual inspection…
• Intersection of roof planes
• Valleys, hips, and ridges
• Roof penetrations
Slate Repair
If slates are cracked, misaligned, or need to be repaired, the patented TruSlate® Premium
Roofing System allows for both simple and painless repairs.*
*This product is covered by one or more U.S. patents or patent applications. See gaf.com/patents for details.
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With GAF’s revolutionary TruSlate® Premium Roofing System, cracked or broken slates are simply slid out of the TruGrip™ Battens & Hangers and a new slate is slid into its place.
It’s as simple as that! There’s no need for difficult, time-consuming, and expensive repairs that
traditional slating repairs require. As always, follow TruSlate® published application instructions for specific installation details.
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Snow Guards
Snow guards should be used generously in extreme climates. The number of snow guards
needed depends on the size and slope of the roof. In some regions, additional snow guards
will be required to hold the additional weight of ice and snow during severe winters. Consult
with the snow guard manufacturer or your design professional for further details. For general
snow guard recommendations for installation, refer to GAF’s TruSlate® snow guard installation
sheet.
For further details on installing the TruSlate® Premium Roofing System, please contact GAF
Technical Services at 1-800-ROOF-411 or visit truslate.com.
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Quality You Can Trust...From North America’s Largest Roofing Manufacturer!™
©2015 GAF 8/15 • #621 • 1 Campus Dr. Parsippany, NJ 07054 • truslate.com gaf.com RESTS112
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