SECTION 09220

PORTLAND CEMENT PLASTER

PART 1 GENERAL

SECTION INCLUDES

[Metal furring and lathing.]

Portland cement plaster system.

[Smooth] [Glass] [Aggregate] [Raked] [Sprayed] [Struck] [Special rendered] surface finish.

[Access panels.]

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

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

Section[_____-__________]: Metal frames for [recessed light fixtures.] [__________.]

RELATED SECTIONS

Section [______-____________]:	Wall substrate surface.

Section 05400 - Cold Formed Metal Framing: Structural metal studding and framing behind plaster base.

Section 06112 - Framing and Sheathing:	Wood studs.

Section 07900 - Joint Sealers.

[Section 08305 - Access Doors:	Access panels.]

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

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

Section 09210 - Gypsum Plaster.

Section 09260 - Gypsum Board Systems.

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

REFERENCES

ASTM C91 - Masonry Cement.

ASTM C150 - Portland Cement.

ASTM C206 - Finishing Hydrated Lime.

ASTM C207 - Hydrated Lime for Masonry Purposes.

ASTM C631 - Bonding Compounds for Interior Plastering.

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

ASTM C897 - Aggregate for Job-Mixed Portland Cement Based Plasters.

ASTM C926 - Application of Portland Cement Based Plaster.

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

NTMA - National Tile and Marble Association.

PCA (Portland Cement Association) - Plaster (Stucco) Manual.

SYSTEM DESCRIPTION

Fabricate vertical elements to limit finish surface to [1/180] [1/240] [1/360] [____] deflection under lateral point load of [100] [____] lbs ([445] [____] N).

Fabricate horizontal elements to limit finish surface to [1/240] [1/360] [_____] deflection under superimposed dead load and wind uplift loads.

SUBMITTALS

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

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

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

QUALITY ASSURANCE

Perform Work in accordance with [ASTM C926.] [PCA Plaster (Stucco) Manual.] [__________.]

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 [ASTM E119 and] [applicable] [___________] code for fire rated assemblies on conjunction with Section [05400,] [06112,] [09111,] [09206,] [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. [________].

MOCKUP

Provide mockup of plaster system with accessories 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 installation of plaster and until cured.

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.]

[________.]

PLASTER BASE MATERIALS

Premixed Base Coat: [________] type; [________] manufactured by [____________].

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

Cement: [ASTM C150, Type [I] [____] Portland.] [ASTM C91.]

Lime: ASTM [C206, Type S.] [C207, Type S.]

Aggregate: In accordance with [ASTM C897.] [PCA Plaster (Stucco) Manual.]

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

Aggregate: [Natural] [Manufactured] sand, within the following limits:

Sieve Size ________________________Percent Retained

No. [4] [___] ([4.75] [___] mm)	[0] [___]

No. [8] [___] ([2.36] [___] mm)	[0 to 5] [___to___]

No. [16] [___] ([1.18] [___] mm)	[5 to 30] [___to___]

No. [30] [___] ([0.60] [___] mm)	[30 to 65] [___to___]

No. [50] [___] ([0.30] [___] mm)	[65 to 95] [___to___]

No. [100] [___] ([0.15] [___] mm)	[90 to 100] [___to___]

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 masonry] surfaces; [________] manufactured by [____________].

Admixtures: [Air entrainment] [________] type; [________] manufactured by [____________].

[Plaster Mix Reinforcement: Glass fibers, chopped to 1/2 inch (13 mm) nominal length, alkali resistant.]

PLASTER FINISH MATERIALS

Premixed Finishing Coat:	[________] type; [________] color [as selected]; [________] manufactured by [____________].

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

Cement: As specified for plaster base coat, [white] [gray] color.

Lime: As specified for plaster base coat.

Color Pigment: [Mineral oxide] [Synthetic] [________] type, [________] color; [________] manufactured by [____________].

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

FINISH AGGREGATE

Mineral Aggregate: [________] colored [limestone] [marble] [granite] [________]; graded to No. NTMA [0] [1] [2] [3] [4] [____] size chip.

Glass Aggregate:	Crushed glass, color range of [________], graded to No. [0] [1] [2] [____] size chip.

FURRING AND LATHING

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].

Wire Mesh Reinforcement:	[2 x 2] [1-1/2 x 1-1/2] [____x____] inch ([50 x 50] [38 x 38] [____x____] mm) galvanized steel [24] [____] gage ([0.6] [____] mm) wire, woven mesh, [self-furring type.]

Underlayment: [Asphalt saturated No. 15 felt.] [________.]

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] [extruded plastic] [zinc], 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 [26] [____] gage ([0.5] [____] mm) thick; [accordion] [________] profile, [2] [____] inch ([50] [____] mm) [expanded metal] [solid] flanges each side; [galvanized] [rust inhibitive prime paint] finish.

Anchorage Methods: 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.

Polyethylene Sheet: Clear, 6 mil (0.15 mm) thick.

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 [____________].

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

CEMENT PLASTER MIXES

Mix and proportion cement plaster [in accordance with ASTM C926, Type [C] [CM] [L] [M] [CP] [P].] [in accordance with PCA Plaster (Stucco) Manual.] [in accordance with manufacturer's instructions.] [as indicated.]

Base Coat [and Brown Coat]: One part cement, minimum [3-1/2] [____] and maximum [4] [____] parts aggregate, and minimum [15] [____] percent and maximum [25] [____] percent hydrated lime, [and glass fibers at a rate of [1-1/2] [____] lbs ([0.7] [____] Kg) per sack of cement.]

Finish Coat:	One part cement, minimum [____] and maximum [____] parts aggregate, [minimum [____] percent and maximum [____] percent pigment,] and minimum [____] percent and maximum [____] percent lime.

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

Finish Coat:	Premix in accordance with manufacturer's instructions.

Mix only as much plaster as can be used prior to initial set.

[Add color pigments to finish coat in accordance with manufacturer's instructions. Ensure uniformity of mix and coloration.]

Mix materials dry, to uniform color and consistency, before adding water.

Add [air entrainment admixtures to [all coats] [finish coat] to provide [5-7] [____] percent entrainment] [________] in [all coats.] [[________] coat.]

Protect mixtures from freezing, frost, contamination, and evaporation.

Do not retemper mixes after initial set has occurred.

PART 3 EXECUTION

EXAMINATION

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

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.

PREPARATION

Dampen masonry surfaces to reduce excessive suction.

Clean concrete surfaces of foreign matter. Clean surfaces using acid solutions, solvents, or detergents. Wash surfaces with clean water.

Roughen smooth concrete surfaces and apply bonding agent. Apply in accordance with manufacturer's instructions.

INSTALLATION - LATHING MATERIALS

Apply one ply of felt underlayment over substrate; weather lap edges 4 inches (100 mm) minimum. Fasten in place.

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

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

Apply self furring reinforcement with self furring ribs perpendicular to supports.

Lap ends minimum [1] [____] inch ([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.

CONTROL [AND EXPANSION] JOINTS

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

After initial set, scribe contraction joints in exterior work [every [3] [____] feet ([1] [____] m) in each direction] [as indicated on reflected ceiling plan] by cutting through 2/3 of the cement plaster depth, neatly, in straight lines.

Locate exterior control [and expansion] joints [every [12] [____] feet ([3.5] [____] m) in each direction.] [as indicated on reflected ceiling plan.]

Establish control [and expansion] joints with [double casing beads butted tight.] [back to back casing beads, set [1/4] [____] inch ([6] [____] mm) apart.] Set both beads over [6] [____] inch ([150] [____] mm) wide strip of polyethylene sheet for air seal continuity.

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

Establish control [and expansion] joints with specified joint device.

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

PLASTERING

Apply plaster in accordance with [ASTM C926.] [manufacturer's instructions.] [PCA Plaster (Stucco) Manual.] [________.]

Apply brown coat to a nominal thickness of [3/8] [____] inch ([9] [____] mm) and a finish coat to a nominal thickness of [1/8] [____] inch ([3] [____] mm) over [masonry] [concrete] [clay tile] [and] [________] surfaces.

Apply scratch coat to a nominal thickness of [3/8] [_____] inch ([9] [____] mm), brown coat to a nominal thickness of [3/8] [____] inch ([9] [____] mm), and a finish coat to a nominal thickness of [1/8] [____] inch ([3] [____] mm) over [metal lathed] [self-furring reinforcement] [and] [________] surfaces.

Moist cure [scratch and] brown coats. [Apply brown coat immediately following initial set of scratch coat].

After curing, dampen base coat prior to applying finish coat.

Apply finish coat and [wood float] [steel trowel] [rake] [struck] [spray] to a smooth and consistent finish.

[Avoid excessive working of surface.	Delay troweling as long as possible to avoid drawing excess fines to surface.]

[[Hand] [Machine] apply aggregate surfacing to full surface coverage.]

Moist cure finish coat for minimum period of [48] [_____] hours.

TOLERANCES

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

SCHEDULES

Laboratories: Two coat cement plaster over metal lath, smooth wood float finish.

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

END OF SECTION