HomeMy WebLinkAboutQ_Specification 092411 portland cement plaster-one coat-elastomeric top coat
PORTLAND CEMENT PLASTER - ONE
Master Multi-Family Specifications COAT/ELASTOMERIC TOP COAT
Architect's Project No. [ ] 092411 - 1 11 April 2016
SECTION 092411 - PORTLAND CEMENT PLASTER - ONE COAT/ELASTOMERIC TOP COAT
PART 1 - GENERAL
1.1 SECTION INCLUDES
A. Fiber reinforced portland cement plaster wall cladding.
1.2 QUALITY ASSURANCE
A. Applicator: Company specializing in cement plaster work with 5 years documented experience.
B. Apply cement plaster in accordance with manufacturer's recommendations, approved ESR report, and as
noted. Plaster products to have approved ESR Report.
C. Plastering shall be of highest quality and finish. Intersections of planes shall be sharp and accurate.
Finished surfaces shall be uniform in texture and color throughout area, and free from imperfections.
1.3 SUBMITTALS
A. Submit under provisions of Section 013000.
B. Provide product data on both base coat and finish coat materials that give characteristics, limitations, of
products, and written acknowledgment that both base and finish coat manufacturer's products are
compatible with each other and be fully warranted when applied with each other.
C. Submit manufacturer's installation instructions for all products within the system.
1.4 FIELD SAMPLES
A. Provide sample panel under provisions of Section 013000.
B. Construct field sample of one wall area, not less than 10 x 10 feet in size, complete, illustrating surface
finish color of finish coat.
C. Locate where directed.
D. Accepted sample may remain as part of the work.
1.5 ENVIRONMENTAL REQUIREMENTS
A. Comply with ASTM C926.
B. Do not apply plaster when substrate or ambient air temperature is less than 50 degrees F unless sand and
mixing water are heated to 70 degrees F and temporary protection is provided to keep minimum 50
degrees F in plastered areas for 24 hours. Do not use frozen materials in mixes.
C. Maintain minimum ambient temperature of 50 degrees F during and after installation of plaster.
D. Protection
1. Protect plaster from uneven and excessive evaporation during hot, dry weather by one of
the following methods:
a. Fog surface with clean water.
b. Cover with minimum 6 mil polyethylene film weighted or taped in place.
2. Protect finished surfaces installed prior to plastering by covering with suitable drop cloths.
3. Screen openings with plastic film when building is subject to hot, dry winds, or
temperature differentials of more than 20 degrees F are present.
1.6 COORDINATION
A. Openings and chases for heating, plumbing and electrical ducts, pipes and conduits shall be built into
plaster work as required. Consult other trades in advance and make provisions for their work to avoid
cutting and patching.
1.7 WARRANTY
A. Comply with provisions of Section 017800.
B. Warrant installed system (including sheathing substrate and sealants) for 5 years to:
4. Be free from defects in material or labor, including cracks, adhesive or bonding failure,
finish degradation, and color retention.
5. Remain in watertight or airtight condition.
1.8 DELIVERY, STORAGE AND HANDLING
A. Deliver materials in manufacturer’s original, unopened contains bearing identifying labels.
B. Store materials off ground or floor, properly covered.
PORTLAND CEMENT PLASTER - ONE
Master Multi-Family Specifications COAT/ELASTOMERIC TOP COAT
Architect's Project No. [ ] 092411 - 2 11 April 2016
C. Protect water-based materials from freezing.
PART 2 - PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. Magna Wall, Inc.
B. Sto Powerwall (Basis of Design).
C. Parex USA.
D. Substitutions: Submit in accordance with Section 016000.
2.2 PLASTER MATERIALS
A. Portland Cement: ASTM C150, Normal - Type I Portland.
B. Lime: ANSI/ASTM C206, Type S.
C. Aggregate: Natural sand in accordance with ANSI/ASTM C897.
D. Water: Clean, fresh, potable and free of mineral or organic matter which can affect plaster.
E. Plaster Mix Reinforcement: Glass fibers, 1/2 inch nominal length, alkali resistant.
F. Finish Texture: As selected by Architect.
2.3 CEMENT PLASTER BASE COAT
A. Mix and proportion cement plaster in accordance with manufacturer's instructions.
B. Do not retemper or use material that has partially set. Do not use frozen, caked or lumpy materials. Clean
mixer or mixing boxes of set of hardened materials before materials for a new batch are loaded. Mix each
batch separately. Thoroughly dry mix materials before adding water.
C. Mix only as much plaster as can be used prior to initial set.
D. Mix materials dry, to uniform color and consistency, before adding water.
E. Protect mixtures from frost, contamination, and evaporation.
F. Work base coat to joints and corners. Allow no cold joints in base coat.
2.4 ACCESSORIES
A. Polystyrene Insulation for Ornamentation:
1. ASTM C578; tested in accordance with ASTM E84 with flame-spread of less than 25.
2. Insulation board must be aged. If air dried, provide board aged for not less than 6 weeks in block
form prior to cutting and shipping.
3. Water Absorption: In accordance with ANSI/ASTM D2842, 4% by volume.
4. Variations in tolerances in dimensions of insulation board shall be minimized to +/- 1/16" in all
dimensions.
5. Label each insulation board to provide information required by applicable codes, and to include
manufacturer's quality control number.
6. Density: 1.0 PCF.
7. Size: As required for shapes and sizes indicated.
8. Thickness: Minimum 1" with greater thickness as detailed to maintain profiles at built-up areas.
9. Edges: All edges to be square, except top edges that are exposed to the weather shall slope per
recommendations of finish coat manufacturer.
10. Insulating Value: R = 3.7.
11. Manufacturer: Approved by coating system manufacturer.
B. Ornamentation Adhesive and Mesh Adhesive: Acrylic based, compatible with the insulation board
substrate, and reinforcing fabric; free of iron containing compounds.
C. Reinforcing Fabric: Balanced open mesh glass fiber fabric, minimum 4.5 oz/s.y., properly treated for
compatibility with other materials of the system and supplied by coating system manufacturer. Provide
impact resistant mesh as described in ASTM E 2486 in addition to standard fabric wherever foam
ornamentation occurs within 6 feet of an adjacent grade or paving, and at parapet caps.
D. Base Coat: Compatible with the insulation board and reinforcing fabric.
E. Joint Sealant: Silicone sealant specified in Section 079005. Listed by the system manufacturer and
approved by the sealant manufacturer for the selected system.
F. Mechanical Fasteners for Foam Shapes: Type, quantity, and spacing as required by acrylic top coat
manufacturer for size and shape or ornamentation.
G. Joint Devices: Refer to Section 092236.
H. Metal Accessories:
1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:
a. Alabama Metal Industries Corporation; a Gibraltar Industries company.
b. CEMCO.
PORTLAND CEMENT PLASTER - ONE
Master Multi-Family Specifications COAT/ELASTOMERIC TOP COAT
Architect's Project No. [ ] 092411 - 3 11 April 2016
c. ClarkDietrich Building Systems, L.L.C.
d. MarinoWARE.
e. Phillips Manufacturing Co.
2. Foundation Weep Screed: Fabricated from Z180 zinc coated (galvanized) sheet steel.
3. External-Corner Reinforcement: Fabricated from metal lath with ASTM A 653/A 653M, G60Z180,
hot-dip galvanized zinc coating.
4. Cornerbeads: Fabricated from [zinc-coated (galvanized) steel.
5. Casing Beads: Fabricated from zinc-coated (galvanized) steel.
6. Control Joints: Fabricated from [zinc-coated (galvanized) steel] [zinc] [vinyl]; one-piece-type, folded
pair of unperforated screeds in M-shaped configuration; with perforated flanges and removable
protective tape on plaster face of control joint. Where wide decorative joints are indicated, provide
devices by Fry Reglet or approved equal.
7. Expansion Joints: Fabricated from zinc-coated (galvanized) steel; folded pair of unperforated
screeds in M-shaped configuration; with expanded flanges.
2.5 FINISH COAT
A. Premixed Exterior Finishing Coat: 100 percent acrylic copolymers, with integral color.
B. Color: As selected by Architect or as indicated in Contract Documents.
C. Acceptable Products: Refer to Section 099450.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Verify that surfaces and site conditions are ready to receive work. Verify that substrate workmanship is
within acceptable tolerances as defined by elastomeric coating manufacturer.
B. Grounds and Blocking and Accessories: Verify items within walls, and other areas receiving plaster for
other Sections of work have been installed.
C. Mechanical and Electrical: Verify services within walls have been tested and approved.
D. Verify that furring, lathing and control/expansion joints are complete and tightly secured in place.
E. Beginning of installation means acceptance of existing conditions.
3.2 PREPARATION
A. Protect surfaces near the work of this Section from damage or disfiguration.
B. Clean concrete surfaces of foreign matter. Clean surfaces using acid solutions, solvents, or detergents.
Wash surfaces with clean water.
3.3 APPLICATION - BASE COAT
A. Apply plaster in accordance with manufacturer's instructions.
B. Apply plaster by machine or hand. Interrupt plaster only at junctions of plaster planes, at openings or at
control joints.
C. Layout to permit completion of an entire surface in one application. Maintain a wet edge. Work to corners
and joints, and do not allow material to set up within a distinct wall area.
D. Interrupt plaster at control joints. Tool through to produce "V" joint at intersection of frames and other
items of metal or wood which act as plaster grounds.
E. Nominal Plaster Thickness: As required by system manufacturer.
F. Apply base coat with sufficient material and pressure to form keys on metal lath.
G. Water Curing of Base Coat:
1. Follow procedures recommended by Portland Cement Association.
2. Cure minimum of 48 hours.
3. Prevent premature dry-out.
4. Allow base coat to cure a minimum of 14 days before applying elastomeric finish coat.
5. Upon completion, point-up plaster around trim and other locations where plaster meets dissimilar
materials.
H. Cut out and patch defective or damaged plaster.
I. Match patching of defective or damaged plaster to existing work in form and texture.
3.4 FOAM ORNAMENTATION INSTALLATION
A. General: Install in accordance with system manufacturer's printed instructions.
B. Adhere foam ornamentation to vertical surfaces in locations indicated
C. Precut board as required to fit openings, projections, etc., stagger vertical joints and corners.
PORTLAND CEMENT PLASTER - ONE
Master Multi-Family Specifications COAT/ELASTOMERIC TOP COAT
Architect's Project No. [ ] 092411 - 4 11 April 2016
D. Adhesive:
1. Apply mixed adhesive to the entire surface of the insulation board with a notched trowel in
accordance with manufacturer's printed instructions.
2. Apply pressure over entire surface of board to ensure uniform contact and high initial grab. Abut
joints tightly. Rasp flush irregularities in insulation board exceeding 1/16 inch.
E. Base Coat and Standard Reinforcing Fabric:
1. Using stainless steel trowel, apply base coat mixture to a uniform thickness of 1/16 inch.
2. Immediately place reinforcing fabric against the wet base coating, trowel from center to edges,
embedding fabric into the coating.
3. Use reinforcing fabric continuous at corners and lapped not less than 2-1/2 inches at fabric edges.
Provide an additional layer of reinforcing fabric at exterior corners.
4. Install additional reinforcing fabric at diagonally at corners of openings.
5. Avoid wrinkles while embedding the reinforcing fabric.
6. Back wrap insulation board at base.
7. Verify base coating surface is dry and hard before proceeding to finish application.
F. Base Coat and Reinforcing Mesh for Impact-Resistance Areas
1. Using stainless steel trowel, apply impact adhesive to entire surface of board to a uniform thickness
of 3/32 inch.
2. Immediately embed first layer of reinforcing mesh into wet base coat using trowel. Smooth until
mesh is fully embedded. Butt ends of mesh pieces tightly. Do not lap ends.
3. Allow 24 hours for base coat to form a positive bond. Protect from damage and weather while
curing.
4. Apply a second layer of standard reinforcing mesh and adhesive mixture over first layer of
reinforcing fabric as specified above.
3.5 FINISH COAT INSTALLATION
A. Apply finish coat in accordance with manufacturer’s instructions.
B. Refer to Section 099450.
3.6 TOLERANCES
A. Maximum Variation from True Flatness: 1/8 inch in 10 feet as measured with a straight edge placed at any
location on the surface.
3.7 PATCHING
A. Patch defects in workmanship and materials. Patches in finished areas shall match adjacent surfaces.
3.8 CLEANING
A. Removing plaster and protective materials from expansion beads and metal accessories. Remove plaster
spatters and debris from other surfaces. Remove rubbish, debris, and scaffolds from spaces and leave
broom clean.
3.9 FIELD QUALITY CONTROL
A. Manufacturer's Field Services: Notify manufacturer prior to start of work and make arrangements for
manufacturer's technical representative to be present during first day's work to verify work is being
conducted in accordance with their recommendations, and at minimum monthly intervals during the course
of plastering work on the project.
END OF SECTION