SECTION 09215

VENEER PLASTER

PART 1 GENERAL

SECTION INCLUDES

[Gypsum backing board.]

Veneer plaster, [one] [two] coat application over [sheet gypsum] [plaster base] [masonry] [concrete] [and] [________] surfaces.

RELATED SECTIONS

Section [_____-__________]: Masonry substrate.

Section 03300 - Cast-in-Place Concrete: Concrete substrate.

Section 08305 - Access Doors.

Section 09210 - Gypsum Plaster.

[Section 09260 - Gypsum Board Systems: Gypsum backing board substrate.]

[Section [______-____________]: Electric radiant heating cable.]

REFERENCES

[ANSI/ASTM C442 - Gypsum Backing Board.]

ANSI/ASTM C587 - Gypsum Veneer Plaster.

ANSI/ASTM C588 - Gypsum Base for Veneer Plasters.

ANSI/ASTM C631 - Bonding Compounds for Interior Plastering.

ASTM C665 - Mineral Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing.

ANSI/ASTM C843 - Application of Gypsum Veneer Plaster.

ANSI/ASTM C844 - Application of Gypsum Base to Receive Gypsum Veneer Plaster.

ANSI/ASTM E90 - Laboratory Measurement of Sound Transmission Loss of Building Partitions.

ANSI/ASTM E119 - Methods for Fire Tests of Building Construction and Materials.

GA 150 - Application of Gypsum Base for Gypsum Veneer Plasters and Application of Gypsum Veneer Plaster.

GA 216 - Recommended Specifications for the Application and Finishing of Gypsum Board.

SYSTEM DESCRIPTION

Acoustic Attenuation for [Identified] Interior Partitions: [________] STC in accordance with ANSI/ASTM E90.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Product Data: Provide data on veneer plaster products and [________].

Samples:	Submit [two] [_______] sample panels, [____x____] inch ([____x____] mm) in size illustrating veneer finish and texture.

Manufacturer's Certificate: Certify that [Products] [________] meet or exceed [specified requirements] [________].

QUALITY ASSURANCE

Perform Work in accordance with the following:

[Apply gypsum backing board in accordance with ANSI/ASTM C844 and GA 216.]

Apply gypsum veneer plaster in accordance with ANSI/ASTM C843.

Maintain [one copy] [[____] copies] of [each] document on site.

REGULATORY REQUIREMENTS

Conform to [applicable] [________] code [and ASTM E119] for fire rated assemblies in conjunction with Sections [09210] [09260] [and] [________] as follows:

Fire Rated Partitions: Listed assembly by [UL] [FM] No. [____].

Fire Rated Ceiling [and Soffits]: Listed Assembly by [UL] [FM] No. [____].

Fire Rated Structural Column Framing: Listed assembly by [UL] [FM] No. [____].

Fire Rated Structural Beam Framing: Listed assembly by [UL] [FM] No. [____].

Provide certificate of compliance from [authority having jurisdiction] [________] indicating approval of products.

ENVIRONMENTAL REQUIREMENTS

Do not apply veneer plaster when substrate or ambient air temperature is less than [50] [____] degrees F ([10] [____] degrees C) nor more than [80] [____] degrees F (27 degrees C); for 24 hours prior to, during operations and after, until building heating system can maintain the

above minimum temperature.

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Gypsum Veneer Plaster:	[ANSI/ASTM C587] [________].

Gypsum Backing Board: [ANSI/ASTM C588,] [standard type] [fire rated Type X]; [aluminum foil backed;] [3/8] [1/2] [5/8] inch ([9.5] [12.7] [15.9] mm) thick, [[__ x __] inch ([__ x __] mm) sheet size]; [square] [tapered] [rounded] edges, ends square.

Gypsum Board Metal Accessories: [GA 216] [________].

Acoustic Insulation:	[ASTM C665 Type [I] [II] [III] Class [A] [B] [C],] glass fiber blanket; [[____] inch ([____] mm) thick] [thermal resistance R of [____] (RSI of [____])].

Reinforcing Tape, Joint Compound, Adhesive, Water, Fasteners: [GA 216] [________].

Bond Coat: [ANSI/ASTM C631] [________], vinyl polymer type.

MIX DESIGN

Develop plaster mix in accordance with [ANSI/ASTM C587] [manufacturer's instructions].

PART 3 EXECUTION

EXAMINATION

Verify substrate conditions under provisions of Section [01039.] [________.]

Verify masonry mortar joints are cut flush and surface is ready to receive work of this Section. Verify no bituminous or water repellent coatings exist on masonry surface.

Verify concrete surfaces are flat, honeycomb is filled flush, and surface is ready to receive work of this Section. Verify no bituminous, water repellent, or form release agents exist on concrete surface.

Verify gypsum board substrate is flat, joints are taped and sanded, and surface is ready to receive work of this Section. Verify joint and surface perimeter accessories are in place.

Verify gypsum plaster base [has been installed in accordance with ASTM C844,] is flat, smooth and surface is ready to receive work of this Section. Verify joint and surface perimeter accessories are in place.

[Verify electric radiant heat cables are secured to substrate.]

PREPARATION

Clean surfaces of dust or loose matter.

Remove projections greater than 1/8 inch (3 mm) and fill depressions greater than 1/4 inch (6 mm) with [Portland cement mortar] [latex filler] [________].

Apply [color tinted] bond coat to prepare masonry surfaces within [____] hours of veneer plaster application. Apply in accordance with manufacturer's instructions.

INSTALLATION - GYPSUM BACKING BOARD

Place acoustical insulation in partitions tight within spaces, around cut openings, behind and around electrical and mechanical items within or behind partitions, and tight to items passing through partitions.

Install gypsum backing board in accordance with GA 216.

Use [drywall screws] [nails] to fasten gypsum board to framing substrate.

Single Layer:

Erect [fire rated] gypsum board [vertical] [horizontal] [in direction most practical and economical], with ends [and edges] occurring over firm bearing.

At furred partition faces, place [4] [____] inch ([100] [____] mm) wide strip of gypsum board, same thickness as furring, at perimeter of wall openings and partition.

****** [OR] ******

Double Layer:

Erect first layer of [fire rated] gypsum board, [perpendicular] [parallel] to framing or furring members.

Place second layer of [fire rated] gypsum board, perpendicular to first layer. Ensure end joints of second layer do not occur over joints of first layer.

Secure second layer with [adhesive and sufficient support to hold in place] [fasteners]. [Apply adhesive in accordance with manufacturer's instructions.]

Tape, fill, and sand filled joints, edges, corners, openings, and fixings to produce surface ready to receive veneer finish.

Feather coats onto adjoining surfaces so that joint camber is maximum [1/32] [____] inch ([0.8] [____] mm).

APPLICATION - VENEER PLASTER

Apply gypsum veneer plaster in accordance with [ANSI/ASTM C843] [manufacturer's instructions].

Dampen [masonry] [and] [concrete] surfaces without visible water on surface, to minimize suction from veneer plaster materials.

Apply single coat immediately after dampening substrate] [over substrate] to a thickness of [3/16] [____] inch ([4.8] [____] mm).

****** [OR] ******

Apply Two Coats:

[Immediately after dampening,] apply base coat [to a thickness of [1/8] [____] inches ([3.2] [____] mm)] [to cover the electric radiant heat cables].

Apply final coat over slightly green, almost dry base coat, to a thickness of [1/16] [____] inch ([1.6] [____] mm).

Total Thickness:	[3/16] [____] inch ([4.8] [____] mm).

Finish surface to [flat, smooth, hard trowel] [spray applied] [________] finish.

ERECTION TOLERANCES

Maximum Variation From Specified Thickness: Plus or minus [1/64] [____] inch ([0.4] [____] mm).

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500.] [________.]

Do not permit traffic near unprotected finished surfaces.

SCHEDULES

Main Foyer 100: Block masonry substrate, two coat application, 1/4 inch thick total, spray applied.

Corridors 101 and 105: Gypsum board substrate, one coat application, 3/16 inch thick, smooth finish.

END OF SECTION