SECTION 09210

GYPSUM PLASTER

PART 1 GENERAL

SECTION INCLUDES

[Hardwall] [Light weight aggregate] [________] plaster system.

[Metal furring and lath.] [Gypsum lath.]

[Access panels.]

[Plaster fireproofing for building structural members.]

[Plaster base for gypsum veneer plaster.]

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

[Section 08305 - Access Doors: Metal access panels integral with gypsum plaster.]

Section [______-____________]: Metal frames for [recessed light fixtures.] [________.]

RELATED SECTIONS

Section [_____-__________]: Wall substrate surface.

Section 05400 - Cold Formed Metal Framing: Metal stud framing behind plaster finish.

Section 07900 - Joint Sealers.

Section 06112 - Framing and Sheathing:	Wood studs.

[Section 08305 - Access Doors:	Access panels.]

Section 09111 - Metal Stud Framing System: Metal stud framing behind plaster finish.

[Section 09206 - Metal Furring and Lathing: [Metal furring] [and] [lathing] for plaster base.]

[Section 09215 - Veneer Plaster.]

Section 09220 - Portland Cement Plaster.

Section 09260 - Gypsum Board Systems.

Section [______-____________]: Applied surface finish of [________].

REFERENCES

ASTM C28 - Gypsum Plaster.

ASTM C35 - Inorganic Aggregates for use in Gypsum Plaster.

ASTM C37 - Gypsum Lath.

ASTM C61 - Gypsum Keene's Cement.

ASTM C206 - Finishing Hydrated Lime.

ASTM C588 - Gypsum Base for Veneer Plasters.

ASTM C631 - Bonding Compounds for Interior Plastering.

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

ASTM C842 - Application of Interior Gypsum Plaster.

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

ASTM C847 - Metal Lath.

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

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

GA (Gypsum Association) - Application of Gypsum Base for Gypsum Veneer Plasters and Application of Gypsum Veneer Plaster.

GA-201 - Using Gypsum Board for Walls and Ceilings.

GA-600 - Fire Resistance Design Manual.

Lath and Plaster Institute of [________].

SYSTEM DESCRIPTION

Acoustic Attenuation for [Identified] Interior Partitions: STC of [____] in accordance with ASTM E90.

SUBMITTALS

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

Product Data: Provide data on plaster materials, characteristics, and limitations of products specified.

QUALITY ASSURANCE

Perform Work in accordance with [GA-201,] [GA -Application of Gypsum Base for Gypsum Veneer Plasters and Application of Gypsum Veneer Plaster,] [GA-600].

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

QUALIFICATIONS

Applicator: Company specializing in performing the work of this section [with minimum [__________] years [documented] experience] [approved by manufacturer].

REGULATORY REQUIREMENTS

Conform to [ANSI/ASTM E119 and] [applicable] [___________] code for fire rated assemblies in conjunction with Section [05400,] [06112,] [09111,] [09206,] [09260,] [and] [________] as follows:

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

Fire Rated Ceilings [Bulkheads,] [and] [Interior 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. [________].

MOCKUP

Provide mockup of interior [wall] [and] [ceiling] system under provisions of Section [01400.] [________.]

Construct mockup, [____] feet ([____] m) long by [____] inch ([____] mm) wide, illustrating [surface finish] [and] [________].

Locate [where directed.] [________.]

Mockup may [not] remain as part of the Work.

ENVIRONMENTAL REQUIREMENTS

Do not apply 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).

Maintain minimum ambient temperature of 50 degrees F (10 degrees C) during and after installation of plaster.

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

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

PLASTER BASE MATERIALS

Plaster:	[ASTM C28;] gypsum neat hardwall type, [fibrated] [unfibrated]; [________] manufactured by [____________].

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

Plaster:	[ASTM C28;] gypsum mill aggregated type; [________] manufactured by [____________].

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

Plaster:	[ASTM C28;] gypsum wood fiber type; [________] manufactured by [____________].

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

Plaster:	[ASTM C28;] gypsum bonding type; [________] manufactured by [____________].

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

Plaster:	ASTM C588, gypsum type; [________] manufactured by [____________].

Lightweight Aggregate: [ASTM C35;] sand and [vermiculite] [perlite]; [________] manufactured by [____________].

Water: Clean, fresh, potable and free of mineral or organic matter which can affect plaster.

Bonding Agent: [ASTM C631;] type recommended for bonding plaster to [concrete] [and] [concrete block] surfaces; [________] manufactured by [____________].

FINISHING PLASTER

Gypsum/Lime Putty Type: [ASTM C28;] mixture of gaging plaster and lime; [________] manufactured by [____________].

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

Keene's Cement/Lime Putty Type: [ASTM C61 and C206;] mixture of Keene's cement and lime; [________] manufactured by [____________].

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

Sand Float Type:	[ASTM C28 and C35;] prepared mixture of gypsum plaster and sand; [________] manufactured by [____________].

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

Sand Float Type:	[ASTM C61 and C35;] prepared mixture of Keene's cement/lime putty and sand; [________] manufactured by [____________].

Water: Clean, fresh, potable and free of mineral and organic matter which can affect plaster.

GYPSUM LATH

Gypsum Lath:	[ASTM C37,] [standard] [perforated] [fire rated] [insulating] [________] type; [[3/8] [1/2] inch ([10] [13] mm) thick;] [thickness indicated on Drawings;] [________] manufactured by [____________].

METAL LATH

Metal Lath and Accessories: Specified in Section [09206.] [________.]

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

Metal Lath: [ASTM C847;] [flat diamond [self furring] mesh] [flat rib, 3/8 inch (10 mm) high] [rod ribbed, 3/4 inch (19 mm) high] [stamped sheet]; [[3.4] [2.5] [1.75] lb/sq ft ([15] [11] [8] Kg/sq m)] [of weight to suit application]; [backed with [treated] [foil] [________] paper].

ACCESSORIES

Casing Bead:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [square] [bullnosed] [bevelled] [________] edges.

Corner Bead:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [radiused] [bullnosed] [________] edge.

Base Screed:	Formed [sheet steel] [zinc] [PVC]; minimum [26] [____] gage ([0.5] [____] mm) thick; depth governed by plaster thickness; maximum possible lengths; [expanded metal] [solid] flanges, with [bevelled] [________] edge.

Corner Mesh:	Formed steel, minimum [26] [____] gage ([0.5] [____] mm) thick; [perforated] [expanded] flanges shaped to permit complete embedding in plaster; minimum [2] [____] inches ([50] [____] mm) wide; [galvanized] [rust inhibitive prime paint] finish.

Control [and Expansion] Joint Accessories: Formed [steel] [extruded plastic] [zinc], minimum [25] [____] gage ([0.5]

[____] mm) thick; [accordion] [________] profile, [2] [____] inch ([50] [____] mm) [expanded metal] [solid] flanges each side; [galvanized] [rust inhibitive prime paint] finish.

Fasteners: Nails, staples, or other approved metal supports, of type and size to suit application, galvanized, to rigidly secure lath and associated metal accessories in place.

Access Panels, Non-Fire Rated In Plaster on Metal Furring: Formed [stainless] steel; Model [________] manufactured by [________________].

Access Panels, Fire Rated In Plaster on Metal Furring: Formed [stainless] steel, [[____] hour] [[____] label] fire rating; Model [________] manufactured by [________________].

ACOUSTICAL ACCESSORIES

Resilient Furring Channels: [________]; [________] manufactured by [____________].

Acoustical Insulation: [ASTM C665,] friction fit type, unfaced; [____] inch ([____] mm) thick; [________] manufactured by [____________].

Acoustic Sealant: Non-hardening, non-skinning type, for use in conjunction with gypsum plaster system; [________] manufactured by [____________].

PLASTER MIX

Mix and proportion plaster in accordance with [ASTM C842,] [Lath and Plaster Institute of [________],] [and] [manufacturer's instructions].

PART 3 EXECUTION

EXAMINATION

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

Verify that surfaces and site conditions are ready to receive work.

Masonry:	Verify 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.

Concrete: Verify 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 that are detrimental to plaster or plaster bond.

Grounds and Blocking: Verify items within walls for other sections of work have been installed.

Gypsum Lath and Accessories:	Verify substrate is flat and surface is ready to receive work of this section. Verify joint and surface perimeter accessories are in place.

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

Metal Lath and Accessories: Verify lath is flat, secured to substrate, and joint and surface perimeter accessories are in place.

Mechanical and Electrical: Verify services within walls have been tested and approved.

PREPARATION

Dampen masonry surfaces to reduce excessive suction.

Clean concrete surfaces of foreign matter. Thoroughly dampen surfaces before using acid solutions, solvent, or detergents to perform cleaning. Wash surface with clean water.

Roughen smooth concrete surfaces [and smooth faced masonry.]

[Apply bonding agent in accordance with manufacturer's instructions.]

INSTALLATION - LATH MATERIALS

Install gypsum lath in accordance with GA 201.

Install gypsum lath perpendicular to framing members, with lath face exposed. Stagger end joint of alternate courses. Butt joints tight. Maximum gap allowed: [1/8] [____] inch ([3] [____] mm).

Place corner reinforcement diagonally over gypsum lath and across corner immediately above and below openings. Secure to gypsum lath only.

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

Install metal lath as specified in Section [09206.] [________.]

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

Apply metal lath taut, with long dimension perpendicular to supports.

Lap ends minimum [1] [____] ([25] [____] mm). Secure end laps with tie wire where they occur between supports.

[Lap sides of diamond mesh lath minimum [1-1/2] [____] inches ([38] [____] mm). Nest outside ribs of rib lath together.]

Attach metal lath to wood supports using nails at maximum [____] inches ([____] mm) on center.

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

Attach metal lath to metal supports using [tie wire] [____] at maximum [6] [____] inches (150] [____] mm) on center.

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

Attach metal lath to [concrete] [concrete masonry] using wire [hair pins,] [hooks,] [or] [loops]. Ensure that anchors are securely attached to concrete and spaced at maximum [24] [____] inches ([600] [____] mm) on center.

INSTALLATION - ACCESSORIES

Continuously reinforce internal angles with corner mesh, return metal lath [3] [____] inches ([75] [____] mm) from corner to form the angle reinforcement; fasten at perimeter edges only.

Place corner bead at external wall corners; fasten at outer edges of lath only.

Place strip mesh diagonally at corners of lathed openings. Secure rigidly in place.

Place [4] [____] inch ([100] [____] mm) wide strips of metal lath centered over junctions of dissimilar backing materials. Secure rigidly in place.

Place casing beads at terminations of plaster finish. Butt and align ends. Secure rigidly in place.

Coordinate work with installation of metal access panels. Refer to Section 08305.

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

Install metal access panels and rigidly secure in place.

Install frames plumb and level in opening. Secure rigidly in place.

Position to provide convenient access to concealed work requiring access.

INSTALLATION - ACOUSTICAL ACCESSORIES

Install resilient furring channels [24] [____] inches ([600] [____] mm) on center at right angles to framing members. Place end joints over framing members. Terminate channels [____] inches ([____] mm) short of door frames and perimeter construction.

Fit acoustical insulation tight between partition framing members. Pack insulation around mechanical, electrical, or other components in partition.

Place acoustical sealant at gypsum [backing board] [lath] partition perimeter in accordance with manufacturer's instructions. Seal penetrations of conduit, pipe, duct work, rough-in boxes, and other components.

CONTROL [AND EXPANSION] JOINTS

Locate control [and expansion] joints [every [20] [____] feet ([6] [____] m).] [as indicated.]

Use [double casing bead [butted tight] [spaced [1/4] [____] inch ([6] [____] mm) apart]] [preformed device] to form joint.

Coordinate joint placement with [other related work.] [Section 09206.] [________.]

PLASTERING

Apply gypsum plaster in accordance with [ASTM C842] [and] [manufacturer's instructions].

Apply brown and finish coats over [gypsum lath] [masonry] [concrete] [clay tile] [and] [________] surfaces. [Apply brown coat to a nominal thickness of 3/8 inch (9 mm).]

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

Apply scratch, brown, and finish coats over [metal lath] [and] [________] surfaces. [Apply scratch and brown coats to a nominal thickness of 3/8 inch (9 mm) each.]

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

Apply special scratch and brown coat base over [metal lath] [and] [________] surfaces as a base for veneer plaster specified in Section [________]. Apply in acccordance with ASTM C844. [Apply scratch and brown coats to a nominal thickness of 3/8 inch (9 mm) each.]

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

Apply finish coat to minimum [1/8] [____] inch ([3] [____] mm) thickness.

Work the finish coat [flat and smooth, with steel trowel.] [________.]

Perform work in panels to nearest natural break or between accessories.

TOLERANCES

Maximum Variation from True Flatness: [1/8] [____] inch in 10 feet ([3] [____] mm in 3 m).

SCHEDULES

All Offices:	Two coat gypsum plaster over gypsum board lath, smooth finish.

Entry Area: Three coat gypsum plaster over metal lath, course float finish.

Elevator Hoistway Walls:	Three coat lightweight plaster over metal lath, smooth finish where exposed, 2 hour fire rated.

END OF SECTION