Division 7 – Thermal & Moisture Protection
Flashing and Sheet Metal - 07600
Refer to Samet Corporation standard details and standards.
Delivered material is of approved type, shape, gauge, metal, fabrication,
priming, etc., as required, and all accessories are provided.
Isolation provisions are made for dissimilar metals. Do not allow copper and
aluminum flashings to be in contact with each other or with ferrous metal.
Copper or aluminum flashings are to be fastened with non-ferrous nails or
screws. Ferrous equipment bases are not to be set on copper flashings.
Flanges embedded in plastic cement or asphalt is asphalt primed.
Expansion joints are provided and installed as required or as specified. Note
location of joints with respect to drains, downspouts, scuppers, corners, and
other outlets.
Observe methods of installation – nailing and cleating types for spacing and
location; also soldering, welding, bolting, and riveting.
Flashing does not interfere with structural requirements.
Generally see that edge metal is lapped a minimum of 4 inches with 12 inches
staggered nailing or fastening through the back flange unless otherwise
required.
All edge metal laps are coated with sealant on horizontal flange and vertical
rise. Coating covers entire lap and is sandwiched between.
Lengths are as long as practical or specified.
Installation is coordinated with roofing and/or siding installation.
Nailer or cant strip is provided for fastening flashing to roof deck; is of proper
material, well secured, and allows venting if required or specified.
Flashing is embedded and installed over roof membrane assembly with
additional roofing membrane material.
Method of anchoring lower edge of fascia is as required. Observe alignment,
stiffness, etc.
Gravel stops are to be flush with deck unless otherwise required.
GUTTERS
Gutters are adequately supported and allow for movement. Observe
attachment size, type, location, and spacing of hangers and supports.
Gutters are pitched if required and provide for drainage to outlets. Factors of
settlement of wood and concrete cantilevered overhangs sometimes affect
drainage pattern.
Gutter joints are lapped in direction of flow.
Expansion joints, concealed or standing, are provided midway between outlets
or downspouts and/or as required.
Scuppers are installed low enough not to dam water on roof. Overflow drains
and scuppers if indicated or required by code are provided, located properly,
i.e., low point of roof, are of size required and have correct inlet flow elevation.
Accessories are provided if required – basket strainer, bird screens, covers, etc.
Samet Corporation | Building Structures. Building Relationships.
Division 7 – Thermal & Moisture Protection
Flashing and Sheet Metal - 07600
DOWNSPOUTS
Lengths are as long as practical and in accordance with specifications.
Slip joints in direction of flow or allowance for movement is provided.
Hangers or straps as required are provided. Spacing and location are as
required or specified, and each section is supported. Connections of hangers
does not damage finish wall material.
Contact is not made with wall surfaces except for supports.
Downspouts are installed plumb, without excessive lateral or angled joints,
unless indicated or if required to conduct drainage.
Special items are furnished: heads, scuppers, linings, etc.
Downspouts that are indicated to terminate in drainage lines are nearly fitted
and are cleaned and free of building debris or other materials.
BASE AND CAP FLASHINGS
Flashing is provided to suit conditions; cant, size, gauge, and fabrication.
Base flashing extends up sufficiently; flange is properly secured and
embedded at least 4 inches in roofing membrane and is installed similarly to
gravel stops. Mopped felt or suitable membrane covering flashings or cleats
is provided. It is good practice to cover as much as practical to avoid
movement from temperature variations.
Seams are lapped, locked, and soldered as required.
Secure anchorage is provided for size, spacing, and fixing of cleats or other
equipment mountings.
Cap flashings are of shapes, sizes, and gauges required and are installed to
provide secure anchorage, allow movement, and have sufficient laps and
spacing.
Counter flashing is extended sufficiently into masonry walls or into reglet and
is securely anchored and caulked, if necessary.
OTHER ROOF FLASHING
Hip and ridge flashing and venting is provided as required. Check fabrication,
size, gauge, anchorage, and lap. Observe caulking and painting procedures.
Valley flashing is provided as required: open or closed, width, gauge,
anchorage, and lap.
Stepped flashing is provided as required: depth of insertion into wall, and
length of material attached to deck and lap. Plastic cement or approved
material is filled into joints between edges of shingles and flashing as
required.
Reglets are provided at required areas: observe the setting in concrete or
masonry to assure firm anchorage. Reglets are protected to prevent
deformation or filling during installation.
Observe installation of sheet metal into reglets for tightness, weatherproofness, caulking, and lap.
Samet Corporation | Building Structures. Building Relationships.
Division 7 – Thermal & Moisture Protection
Flashing and Sheet Metal - 07600
WALL AND THROUGH WALL FLASHING
Locations for flashings fabrication and design are understood.
Lap, turn up, location in wall, depth in masonry, length, etc., are as required.
Sill flashing and pans extend full depth, are turned up, extend beyond horns
or 4 inches, and are installed for proper drainage.
MISCELLANEOUS
Louvers and vents have adequate flanges and connections for anchorage and
flashings are watertight against driving rains after installation. Insect screen,
bird screen, shutters, etc., are providing as required.
Review drawings and specifications for sheet metal items called for in one and
not the other.
Items such as skylight, roof, hatches, and fans may be suited for installation
with or without flashing. Installation must meet manufacturers’ specifications
when required.
Plastic flashing is of type required and is installed in accordance with
requirements.
Sheet metal termite shields are provided as required.
COMMENTS:
Samet Corporation | Building Structures. Building Relationships.