SECTION 09 24 23 - Cement Stucco
DECORATIVE STUCCO FINISH
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PART 1 GENERAL
1.1
1.2
1.3
SECTION INCLUDES
A.
Portland cement based stone coat stucco.
B.
Portland cement based plaster coat stucco.
C.
Related accessories.
RELATED SECTIONS
A.
Section 03 30 00 - Cast-in-Place Concrete.
B.
Section 04 73 00 - Manufactured Stone Masonry.
C.
Section 04 40 00 - Stone Assemblies.
D.
Section 05 40 00 - Cold-Formed Metal Framing.
E.
Section 06 10 00 - Rough Carpentry.
F.
Section 06 11 00 - Wood Framing.
G.
Section 06 16 36 - Wood Panel Product Sheathing.
H.
Section 07 21 16 - Blanket Insulation.
I.
Section 07 60 00 - Flashing and Sheet Metal.
J.
Section 07 90 00 - Joint Protection.
K.
Division 8 - Doors, Windows and Glass: Windows and door frames.
REFERENCES
A.
ASTM C 67 Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile.
B.
ASTM C 150 Standard Specification for Portland Cement.
C.
ASTM C 897 Standard Specification for Aggregate for Job-Mixed Portland Cement-Based
Plasters.
D.
ASTM C 926 Standard Specification for Application of Portland Cement-Based Plaster.
09 24 00-1
1.4
1.5
1.6
1.7
E.
ASTM C 932 Standard Specification for Surface-Applied Bonding Compounds for Exterior
Plastering.
F.
ASTM C 1063 Standard Specification for Installation of Lathing and Furring to Receive
Interior and Exterior Portland Cement-Based Plaster.
G.
ASTM D 1784 Standard Specification for Rigid Poly (Vinyl Chloride) (PVC) Compounds and
Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds.
SUBMITTALS
A.
Submit under provisions of Section 01 30 00 - Administrative Requirements.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Preparation instructions and recommendations.
2.
Storage and handling requirements and recommendations.
3.
Installation methods.
C.
Selection Samples: For each finish product specified, two complete sets of color chips
representing manufacturer's full range of available colors and patterns.
D.
Verification Samples: For each finish product specified, two samples, minimum size 12
inches (3050 mm) square, representing actual product, color, and patterns.
E.
Manufacturer's Certificates: Certify products meet or exceed specified requirements.
QUALITY ASSURANCE
A.
Manufacturer Qualifications: Company specializing in providing the products of this section
with minimum five years documented experience.
B.
Installer Qualifications: Company specializing in performing Work of this section with
minimum two documented projects of similar size and complexity.
C.
Mock-Up: Provide a minimum 4 foot by 4 foot (1.22 m by 1.22 m) mock-up for evaluation of
surface finish, color, texture and application workmanship.
1.
Locate in areas designated by Architect.
2.
Do not proceed with remaining work until workmanship and color are approved by
Architect.
3.
Rebuild mock-up as required to produce acceptable work.
4.
Accepted mock-up shall be comparison standard for remaining Work
PRE-INSTALLATION MEETINGS
A.
Convene a minimum of one week prior to commencing work of this section.
B.
Review finish locations, substrate requirements, finish placement and tolerances.
C.
Review required access for prior adjacent and subsequent product installations.
DELIVERY, STORAGE, AND HANDLING
A.
Deliver products in manufacturer's unopened packaging with identification labels intact until
ready for installation.
B.
Store materials protected from exposure to harmful environmental conditions and at
temperature and humidity conditions recommended by the manufacturer.
09 24 00-2
1.8
PROJECT CONDITIONS
A.
Maintain environmental conditions (temperature, humidity, and ventilation) within limits
recommended by manufacturer for optimum results. Do not install products under
environmental conditions outside manufacturer's absolute limits.
B.
Exterior Portland Cement Decorative Stucco: Apply exterior Portland cement coatings when
ambient temperature is greater than 40 degrees F (4 degrees C) and when temperature is
expected to remain above 40 degrees F (4 degrees C) for 48 hours following application.
C.
Interior Portland Cement Decorative Stucco: Apply interior Portland cement coatings when
minimum ambient temperature of 50 degrees F (10 degrees C) has been and continues to
be maintained in building for minimum 48 hours prior to application, during application, and
until cured.
PART 2 PRODUCTS
2.1
2.2
MANUFACTURERS
A.
Acceptable Manufacturer: ArcusStone Products, LLC, which is located at: 180 Harbor Dr.
#200; Sausalito, CA 94965; Tel: 415-339-4060; Fax: 415-339-4065; Email:request info
(c.kavalaris@arcusstone.com); Web:www.arcusstone.com
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of Section 01 60
00 - Product Requirements.
DECORATIVE STUCCO FlNlSHES
A.
Portland Cement Stone Coat Stucco: ArcusStonecoat blend of limestone aggregate, bonding
agents and Portland cement.
1.
Weight: 1 lb/sf (4.88 kg/m2), average, for each 1/8 inch (3.2 mm) of thickness when
tested in accordance with ASTM C 67.
2.
Thickness: 3/8 inch (9.5 mm).
3.
Maximum Area Requirement without Control Joints:
a.
Exterior vertical and horizontal applications, 6 sf (0.56 sm).
b.
Interior vertical applications, 25 sf (2.3 sm).
c.
Interior horizontal applications, 6 sf (0.56 sm).
d.
Countertops may be installed without control joints if installed in accordance
with the manufacturer's recommendations.
4.
Color:
a.
Dover.
b.
French Cream 10.
c.
French Cream 33.
d.
Champagne 10.
e.
Champagne 50.
f.
Sienna 16.
g.
Sienna 66.
h.
Taupe 16.
i.
Taupe 50.
j.
Moss 16.
k.
Moss 33.
l.
Seville 16.
m.
Seville 33.
n.
Terra Cotta 16.
o.
Terra Cotta 33.
09 24 00-3
5.
B.
2.3
p.
Custom ______.
Texture:
a.
Chateau.
b.
Sandstone.
c.
Antique.
d.
Chisel.
e.
Custom ______.
Portland Cement Plaster Coat Stucco: ArcusPlaster blend of limestone aggregate, bonding
agents and Portland cement:
1.
Weight: 1 lb/sf (4.88 kg per sm), average, for each 1/8 inch (3.2 mm) of thickness
when tested in accordance with ASTM C67.
2.
Thickness: 3/16 inch (4.8 mm).
3.
Maximum Area Requirement without Control Joints: 144 sf (13.4 sm), with a maximum
length to width ratio of 2.5 to 1.
4.
Color:
a.
Natural.
b.
French Cream 13.
c.
French Cream 82.
d.
Champagne 16.
e.
Champagne 50.
f.
Sienna 13.
g.
Sienna 82.
h.
Mocha 10.
i.
Mocha 82.
j.
Moss 16.
k.
Tuscan Gold.
l.
Seville 16.
m.
Seville 33.
n.
Terra Cotta 10.
o.
Terra Cotta 66.
p.
Custom ______.
5.
Texture:
a.
Country.
b.
Trowel.
c.
Antique Semi-Smooth.
d.
Antique Smooth.
e.
Custom ______.
MATERIALS
A.
Portland Cement: ASTM C 150.
B.
Limestone Aggregates: ASTM C 897.
C.
Bonding Agents: ArcusStone bonding agent is a nontoxic, non-flammable, re-emulsifying
bonding agent that provides a chemical bond between the ArcusStone coating and
substrate. It is suitable for use on exterior and interior, horizontal and vertical surfaces such
as cement plaster brown coat, poured concrete, masonry, cement board, drywall, ceramic
tile, and gypsum plaster.
D.
Acrylic Admixture: ArcusAdMix is a nontoxic acrylic resin emulsion for use with
ArcusStonecoat and ArcusPlaster that increases flexural and compressive strength that
improves bonding between substrate and coating.
E.
Water: Potable.
09 24 00-4
F.
2.4
Accessories: Control joints, corner mesh, corner beads, base screeds, casing beads, reveal
screeds and vented screeds shall comply with ASTM C 1063 and ASTM D 1784.
MIX
A.
Proportion and mix stucco coatings in accordance with manufacturer's recommendations.
B.
Mix only as much stucco finish as can be used prior to initial set.
C.
Add color pigments to finish coat to match colors specified.
D.
Mix materials dry, to uniform color and consistency, before adding water.
E.
Protect mixtures from freezing, frost, contamination, and excessive evaporation.
F.
Do not retemper mixes after initial set has occurred.
PART 3 EXECUTION
3.1
3.2
EXAMINATION
A.
Do not begin installation until substrates have been properly prepared.
B.
Verify surfaces to be coated are dry and clean in accordance with manufacturer's
recommendations.
C.
If substrate preparation is the responsibility of another installer, notify Architect of
unsatisfactory preparation before proceeding.
PREPARATION
A.
Clean and prepare surfaces in accordance with manufacturer's instructions.
B.
Prepare surfaces using the methods recommended by the manufacturer for achieving the
best result for the substrate under the project conditions.
C.
Protect glass and adjacent work from decorative stucco coating application using protective
plastic, tarps, Kraft paper, and non-residue tape.
D.
Concrete Masonry and Brick: Clean concrete and masonry surfaces in accordance with
ASTM C 926.
1.
Prepare Substrate
a.
Inspect brick and masonry units for adhesion strength and re-secure as
required.
b.
Grout and mortar must be struck off flush with the face of the masonry.
c.
Remove paint by mechanical abrasion using: bead blasting, sand blasting,
rotary steel wire brushing using an angle grinder or other methods to effectively
open the coating and produce a surface profile similar to 80 grit sand paper.
Completely removing the paint is usually not required.
d.
Pressure washing, operated at approximately 1200 psi with a flare tip, may be
used where possible.
e.
Clean all surfaces of any efflorescence, mold, scale, soot, dirt or any other
surface contaminants that may interfere with a good bond. Rinse with clean
water.
2.
Apply Basecoat
a.
Bonding Agent: Apply bonding agent in accordance with ASTM C 932. Using a
roller, brush or sprayer, apply a generous and uniform coat of per
manufacturer's application instructions. Let dry before applying brown coat.
09 24 00-5
b.
c.
d.
Apply brown coat, an acrylic modified fiber reinforced brown coat, thick enough
to keep grout joints from "telegraphing" through to the finish coat or, typically
1/4 inch (6 mm) to 3/8 inch (9.5 mm). Lightly scratch horizontally to create more
tooth.
Allow to cure for 48 hours.
Repair any cracks in the brown coat using 6 inch (152 mm) wide detail mesh
embedded in cementitious basecoat.
E.
Poured Vertical Concrete:
1.
Prepare Substrate
a.
Remove form release agents used in the concrete construction process.
Thoroughly clean all surfaces.
b.
Remove paint by mechanical abrasion using: bead blasting, sand blasting,
rotary steel wire brushing using an angle grinder or other methods to effectively
open the coating and produce a surface profile similar to 80 grit sand paper.
Completely removing the paint is usually not required.
c.
Pressure washing, operated at approximately 1200 psi with a flare tip, may be
used where possible.
d.
Clean all surfaces of any efflorescence, mold, scale, soot, dirt or any other
surface contaminants that may interfere with a good bond. Rinse with clean
water.
e.
Cut back or otherwise remove any embedded metal that is exposed in the
surface to be coated.
f.
Fill form tie, "rock pockets" and depressions with a cement grout patching
compound or similar product.
g.
Knock down any concrete spillover or similar protrusions to a min. height of 1/8
inch (3 mm) from face of substrate.
h.
Surfaces must be free of mold, scale, dirt, debris, and excessive surface
moisture.
2.
Apply Basecoat: :
a.
Portland Cement Brown Coat
1)
Apply ArcusBond using a roller, brush or sprayer per manufacturer's
application instructions. Let dry before applying brown coat.
2)
Apply brown coat, acrylic modified fiber reinforced, minimum thickness
1/8 inch (3 mm). Scratch lightly horizontally.
3)
Allow to cure for 48 hours.
b.
Cementitous Acrylic Base Coat:
1)
Apply base coat and finish with a rough texture. Follow base coat
manufacturer's requirements for horizontal and wet locations.
2)
Apply ArcusBond using a roller, brush or sprayer per manufacturer's
application instructions. Broadcast 30 mesh, or equivalent, washed and
graded sand onto the wet ArcusBond. Let dry before applying
ArcusStone finish.
F.
Exterior Sheathing Board
1.
Direct Applied:
a.
Cement type boards must be installed according to the board manufacturer
specifications and decorative stucco manufacturer's requirements.
b.
All approved cement type boards shall be completely covered with a minimum
1/8 inch (3 mm) thick cementitious basecoat with embedded mesh per board
manufacturer's written specifications.
2.
Application with Additional Cladding Materials Installed:
a.
Plywood, OSB, chipboard and wafer board, installed to manufacturer's
specifications and clad with other approved exterior grade products or with a
Portland cement plaster stucco system that includes metal lath, 3/8 inch (9.5
mm) scratch coat and 3/8 inch (9.5 mm) brown coat.
09 24 00-6
3.
G.
Other Requirements and Considerations
a.
Maximum deflection limit of L/360 with studs spaced no more than 16 inches
(406 mm) o.c.
b.
Stud minimum depth 5-1/2". Steel stud minimum 20 gage.
c.
Minimum 1/2" board thickness required.
d.
Must have a secondary weather barrier, either paper-backed metal lath
attached thru to framing, or a weather resistive membrane such as Dryvit's
Backstop NT - Smooth. (DS446) applied to the gypsum sheathing after
applying 4" grid tape to all joints and any exposed ends.
e.
No one-coat applications when using paper-backed metal lath. Portland cement
plaster shall be a minimum 3/4 inch (19 mm) thick (3/8 inch (9.5 mm) scratch
coat and 3/8 inch (9.5 mm) brown coat) under the ArcusStonecoat or
ArcusPlaster coatings.
f.
Portland cement scratch and brown coats are to be acrylic modified and fiber
reinforced.
g.
If using a water resistive barrier such as Backstop NT - Smooth, all sheathing
board surfaces must then be meshed and based with Genesis DM or
equivalent, and standard mesh, prior to any direct-applied ArcusStonecoat or
ArcusPlaster applications.
h.
ArcusBond required to be used over cementitious acrylic basecoats such as
Genesis DM.
i.
All door, window, vent, and other openings are required to have a finish frame /
molding installed.
j.
Outside corners must be reinforced with metal corner reinforcement, 3 x 3
Corner Rite.
k.
All flashing, counter flashing and waterproofing must be installed.
l.
All metal, including lath, flashing, corner guards, and fasteners, are to be
corrosion resistant (galvanized, stainless, etc.).
m.
All horizontal and vertical joints and inside corners must be reinforced as
recommended by sheathing manufacturer. A smooth finish is not required but
joint reinforcing should not project more than 1/8 inch (3 mm) from the face of
the substrate.
n.
Surfaces must be dry and clean of dust, debris, efflorescence, and staining.
o.
Apply a generous and uniform coat of ArcusBond per manufacturer's
application instructions. Let dry before applying any ArcusStone finish.
p.
ArcusBond is not necessary for installation of ArcusStone finishes over new
Portland cement stucco brown coats.
Framed Walls or False Work with 3 Coat Stucco Portland Cement Plaster:
1.
New Installations Framing:
a.
Underlying framing/sheathing assembly shall be designed to limit deflection to
L/360.
b.
Stud spacing, maximum 16 inch (152 mm) o.c.
2.
New Installations Scratch and Brown Coats
a.
Reinforce new Portland cement scratch and brown coats with alkali resistant
fibers and mixed using a minimum of 1 part liquid acrylic admix to 4 parts water.
b.
Portland cement plaster shall be a minimum 3/4 inch (19 mm) thick (scratch
and brown coat) over paper and galvanized diamond mesh metal lath.
c.
Outside corners shall be reinforced with metal corner reinforcement 3x3 Corner
Rite.
d.
Reinforce corners at door and window openings with 6 inch (152 mm) by 12
inch (305 mm) sections of galvanized diamond mesh lath set on a 45 degree
diagonal with the corner.
3.
New and Existing Installations:
a.
Install frames for door, window, vent, and other openings prior to the
ArcusStone material application.
09 24 00-7
b.
c.
d.
e.
f.
g.
Waterproofing, including required flashing and counter-flashing must be in
place.
Metal, including lath, flashing, corner guards, and fasteners, are to be corrosion
resistant galvanized, stainless, etc.
Remove dust and debris and the substrate properly cured for Portland cement
plaster. Clean off all efflorescence or staining prior to any ArcusBond or
ArcusStone material applications.
Check substrate surfaces for finishes to a tolerance of plus 1/4 inch (6 mm) in 5
feet (1.52 m).
Cover cracks in the substrate with Portland cement brown coat or EIFS
basecoat with 4 ounce fiberglass mesh embedded the length of the crack and
extended on all sides of the crack a minimum of 3 inches (76 mm).
ArcusBond: Apply a generous and uniform coat of ArcusBond per
manufacturer's application instructions. Let dry before applying any ArcusStone
finish.
H.
EIFS and other Coated Foam
1.
Apply ArcusStonecoat and ArcusPlaster over EIFS foam, mesh, and basecoat, with
the following requirements:
a.
Do not apply ArcusStone coatings over any type of EIFS finish coat, including
acrylic, elastomeric and urethane
b.
EIFS foam board shall be installed in accordance with manufacturer's
installation instructions and the ArcusStone's requirements.
c.
Provide expansion and control joints as required by the EIFS manufacturer and
the ArcusStone's requirements.
d.
Basecoat shall be an acrylic polymer modified fiber reinforced cementitious mix,
with alkali-resistant 4 oz/sq yd, or heavier, reinforcing mesh imbedded per EIFS
manufacturer's installation instructions and ArcusStone's requirements.
e.
Stipple basecoat by placing a green sponge float against it and pulling off,
creating a rougher surface profile to gain additional tooth to adhere the
ArcusStone Finish.
f.
Basecoat must be clean and free of surface contaminants that may interfere
with a good bond, including any efflorescence.
g.
Apply additional detail mesh with bonder over any cracks in the basecoat prior
to application of ArcusBond.
h.
Apply a generous and uniform coating of ArcusBond re-emulsifying bonder,
using a spray, brush or roller, onto the basecoat per published instructions for
vertical applications. Randomly broadcast 30 mesh sand or equivalent onto wet
bonder.
I.
Interior Gypsum Board
1.
Framing
a.
Walls: Non load bearing: Framing shall be designed to limit deflection to L/240
under loading conditions.
b.
Walls Load bearing: Framing shall be designed to limit deflection to L/360
under loading conditions.
c.
Ceiling/Soffit/Arch: Framing members shall be spaced at 16 inch (152 mm) on
center or less.
2.
Type and Attachment
a.
Gypsum board may be standard type, water-resistant type, tile underlayment,
or fire rated type, and must be a minimum of 1/2 inch 12.5 mm) thick.
3.
Joint Treatment
a.
Reinforce all joints and inside corners with paper or fiberglass mesh tape, fully
embedded in gypsum board compound. Outside corners and exposed gypsum
board edges should be reinforced with metal corner or edge beads set with
gypsum board compound. Level of finish should be similar to Level 3, which
09 24 00-8
4.
5.
J.
3.3
does not require a smooth finish, but all tape and metal trim must be fully
embedded in compound, with a second coat of compound applied over all
corners, joints, and fasteners.
Priming
a.
Substrate surfaces must be dry and clean of loose paint, dust, and debris.
Prime all new standard or type X gypsum wallboard with two coats of a
standard PVA primer or one coat of a high quality flat latex paint. Tile backer
gypsum such as DensShield should NOT be primed. Be sure to follow board
manufacturer's recommended use of primers and installation procedures for the
type of board being used.
ArcusBond
a.
Using a roller, brush or sprayer, apply a generous and uniform coat of
ArcusBond to all surfaces that are to receive the ArcusStonecoat or
ArcusPlaster coating.
b.
On all vertical applications, randomly broadcast 30 mesh or similar washed,
graded sand onto the wet ArcusBond to provide "tooth" to create a more secure
bond.
c.
Let ArcusBond dry before applying ArcusStone finish.
Ceramic or Natural Stone Tile Substrate:
1.
Prepare Substrate:
a.
Check tiles or slabs for adhesion strength and re-secure as required.
b.
Strike all grout and mortar joints flush with the face of the tile or slab.
Mechanically abrade glazed or very slick surfaces.
c.
Use an appropriate cleaning agent to thoroughly clean all surfaces of any mold,
efflorescence, scale, soot, dirt, or any other surface contaminants that may
interfere with a good bond. Rinse surfaces with clean water to remove any
residue.
2.
Apply Basecoat:
3.
Basecoat: Portland Cement Brown Coat
a.
Using a roller, brush or sprayer, apply a generous and uniform coat of
ArcusBond per manufacturer's application instructions. Let dry before applying
brown coat.
b.
Apply brown coat, an acrylic modified fiber reinforced brown coat, thick enough
to keep grout joints from "telegraphing" through to the finish coat, typically 1/4
inch (6 mm) to 3/8 inch (9.5 mm). Brown coat must be scratched lightly.
c.
Allow to cure for 48 hours.
4.
Basecoat: Cementitous Acrylic Base Coat
a.
Use 6 ounce or heavier mesh, embedded in cementitious basecoat, making
sure to finish the basecoat with a rougher texture. Follow basecoat
manufacturer's requirements and limitations for horizontal and wet locations.
b.
Applications in Wet Locations
c.
ArcusStonecoat applications over ceramic or natural stone tile or stone slab are
often in wet locations such as shower surrounds, steam rooms, pool and spa
horizontal surface areas, and other horizontal applications such as floors,
ledges and seats.
d.
ArcusPlaster is not an approved finish material for these locations and
applications.
INSTALLATION
A.
Install in accordance with manufacturer's instructions.
B.
Install accessories in accordance with ASTM C 1063.
C.
Apply bonding agent in accordance with ASTM C 932.
09 24 00-9
3.4
D.
Apply Portland cement stone coat stucco and Portland cement plaster coat stucco in
accordance with ASTM C 926
E.
Apply to color and texture specified.
F.
Avoid excessive working of surface. Delay troweling as long as possible to avoid drawing
excess fines to surface.
G.
Curing: Protect ArcusStone coatings against uneven and excessive evaporation and from
strong flows of dry air. Provide covers and barriers to deflect sunlight and wind.
TOLERANCES
A.
3.5
ADJUSTING
A.
3.6
3.7
Maximum Variation from Flat Surface: 1/8 inch in 10 feet (3 mm in 3 m).
Remove damaged or defective plaster by cutting and replace with specified materials to
match adjacent plaster.
PROTECTION
A.
Protect installed products until completion of project.
B.
Touch-up, repair or replace damaged products before Substantial Completion.
SCHEDULES
A.
:
B.
:
END OF SECTION
09 24 00-10