Fort Bliss National Cemetery VA Project 886CM3026

Gravesite Expansion Bid Documents

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SECTION 09 24 00

PORTLAND CEMENT PLASTERING (STUCCO)

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies removal and direct-applied portland cement based plaster (stucco), including:

1. Removal and disposal of existing stucco finish system (whether direct-applied or over lath).

2. Substrate preparation, patching, and cleaning of existing concrete masonry unit partial height stair and ramp walls and structural clay tile walls, clay tile lintels, clay tile covered concrete lintels and where else noted in this specification or shown in the drawings.

3. Three-coat direct-applied Portland cement exterior plaster system

(scratch coat, brown coat, and finish coat).

1.2 RELATED WORK

A. Section 07 92 00, JOINT SEALANTS.

1.3 TERMINOLOGY

A. Definitions and description of terms to be in accordance with ASTM C11 and ASTM C926 and as specified.

B. Self-furring Lath: Metal plastering bases having dimples or crimps designed to hold the back plane of the lath 6 to 10 mm (1/4 to

3/8 inch) away from the plane of the solid backing.

C. Solid Backing or Solid Bases: Concrete, masonry, sheathing, and similar materials to which plaster is directly applied.

D. Wet Areas: Areas of a building where cyclic or continuous exposure to very humid or wet conditions, or in which a dew point condition may occur in the plaster.

1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, AND SAMPLES.

B. Written Demolition and Clean Plan:

1. Submit a detailed removal methodology ensuring the safety of structural clay tile units and concrete masonry unit wall, including tool choices, describing how existing stucco will be cleanly removed and post-demolition cleaning methods.

C. Manufacturer's Literature and Data, noting where each accessory will be installed:

1. Accessories for plaster, each type.

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a. Casing beads

b. Corner beads

c. Control/Expansion joints

2. Metal plastering bases, each type, noting where each type will be used:

a. Cornerite, installed diagonally at corners of all door and window openings

3. Fasteners.

4. Admixtures and bonding agents, including mixing and application instructions.

D. Samples:

1. Accessories for plaster, each type, not less than 152 mm (6 inches) long.

2. Physical Panel showing finish coat 152 to 305 mm (6 by 12 inches) minimum for approval prior to mockup submittal, to ensure finish matches the existing stucco to remain on the same structure.

3. Submit physical samples to the VA COR and include photographs of all physical samples w/ materials labeled/identified in the photo for record in the digital submittal.

E. Installers qualifications.

F. Mockups (Those required not part of the completed work). Submit photographs of all mockups in the digital submittal.

G. Mockups on existing substrate.

1.5 DELIVERY, STORAGE AND PROTECTION

A. Deliver manufactured materials in the manufacturers’ original unbroken packages or containers which are labeled plainly with the manufacturers’ names and brands. Keep cementitious materials dry and stored off the ground, under cover, and away from sweating walls and other damp surfaces until ready for use.

1.6 PROJECT CONDITIONS

A. Do not apply exterior plaster when the ambient temperature is less than

4 degrees C (40 degrees F), or when a drop in temperature below

4 degrees C (40 degrees F) is expected within 24 hours after application.

B. Do not apply plaster to frozen surfaces or surfaces containing frost.

C. Do not use frozen materials in the mix.

D. Protect plaster coats against freezing for a period of not less than

24 hours after application.

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1.7 QUALITY ASSURANCE

A. Installers Qualifications: Work is to be performed by installer having a minimum of three (3) years’ experience for work relating to this

Section. Submit installer qualifications.

B. Mockups (Independent of building structure, not part of completed work):

1. Build (1)(8 square feet minimum) mockup for each of the (2) substrate types in the project, plus one additional mockup for any unforeseen substrate discovered during demolition for a total of at least (3) mockup panels. Additional mock-ups may be required at no additional charge to the VA if initial mockups are not an adequate match to the existing stucco finish on the building, as determined by the VA COR.

a. Existing concrete masonry unit substrate as at the ramp and stair partial height walls and potentially the entrance canopy columns and structure.

b. Existing unglazed structural clay tile substrate as at the typical exterior building wall and associated lintels.

c. Existing cast-in-place concrete or other substrate differing from the substrate in the other two mock-up panels, as potentially found at the entrance canopy columns and/or structure.

1) If the existing substrate for the entrance canopy and associated columns and walls is found to be the same substrate as one of the other mock-ups being constructed, a separate mock-up panel for the entrance canopy and associated columns/walls is note required.

2) Existing substrate for the stucco at the existing entrance canopy and associated columns and walls is unknown as there was no available asbuilt documentation from the VA identifying its composition. Substrate could include, but is not limited to, structural clay tile, concrete masonry unit, cast-in-place concrete, and wood sheathing. Base Bid shall include the most costliest solution for re-stucco work in this area, including the cost for a lath applied system should existing substrate surface conditions warrant the mechanical attachment.

2. Include plastering accessories (building paper beneath control joint if a non-masonry or concrete substrate), corner reinforcement, cornerbeads and casing bead at the stucco base). Mockup shall have

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Approved mockups may not become part of completed work. Provide additional mock-ups as necessary to produce stucco texture and color matching existing stucco texture and color to the VA’s approval.

C. Mockups (On existing substrate, part of completed work once approved).

1. Prior to full application, prepare a minimum 4 foot by 4 foot (16

SF) test field on each existing substrate in a location selected by the VA COR.

2. Conduct a field adhesion test (in accordance with ASTM C1583) to evaluate the substrate following full cure of the new scratch/brown coat to confirm bond capability exceeds a minimum 150 psi tensile bond strength. Obtain approval of VA COR on testing date prior to scheduling test.

1.8 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by basic designation only.

B. ASTM International (ASTM):

A653/A653M-20...........Steel Sheet, Zinc-Coated (Galvanized) or Zinc-

Iron Alloy-Coated (Galvannealed) by the Hot-Dip

Process

A1064/A1064M-18a........Carbon-Steel Wire and Welded Wire

Reinforcement, Plain and Deformed, for Concrete

C11-18b.................Terminology Relating to Gypsum and Related

Building Materials and Systems.

C91/C91M-18.............Masonry Cement

C150/C150M-20...........Portland Cement

C206-14.................Finishing Hydrated Lime

C207-18.................Hydrated Lime for Masonry Purposes

C260/C260M-10a(2016)....Air Entraining Admixtures for Concrete.

C847-18.................Metal Lath

C897-15(2020)...........Aggregate for Job-Mixed Portland Cement Based

Plasters

C926-20.................Application of Portland Cement-Based Plaster

C932-06(2019)...........Surface-Applied Bonding Compounds for Exterior

Plastering

C933-18.................Welded Wire Lath

C979/C979M-16...........Pigments for Integrally Colored Concrete

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C1002-18................Steel Self-Piercing Tapping Screws for the

Application of Gypsum Panel Products or Metal

Plaster Bases to Wood Studs or Steel Studs

C1063-19a...............Installation of Lathing and Furring to Receive

Interior and Exterior Portland Cement-Based

Plaster

E90-09(2016)............Test Method for Laboratory Measurement of

Airborne Sound Transmission Loss of Building

Partitions and Elements

E119-20.................Test Methods for Fire Tests of Building

Construction and Materials

E413-16.................Classification for Rating Sound Insulation

C. Commercial Item Description (CID):

A-A-55615-95(R2006).....Shield, Expansion (Wood Screw and Lag Bolt

Self-Threading Anchors)

PART 2 - PRODUCTS

2.1 METAL PLASTERING BASES

A. Building Paper Backing for Metal Plastering Bases:

1. Backing attached to metal base as specified in ASTM C933.

2. Vapor Permeable Backing: Fed. Spec. UU-B-790, Type I, Grade D.

3. Provide (2) layers when installing stucco over wood or gypsum sheathing. Not required over continuous masonry or concrete substrates.

B. Metal plastering base control joint required at transitions of differing materials, such as from structural clay tile to concrete.

2.2 ACCESSORIES FOR CEMENT PLASTER(STUCCO):

A. Provide accessories that are roll formed galvanized steel, except that cornerite and strip lath that are formed from steel sheets with manufacturer’s standard galvanized coating.

B. Control Joints: ASTM C1063, zinc-coated (galvanized) steel;

one-piece-type, folded pair of unperforated screeds in M-shaped configuration; with perforated flanged and removable protective tape on plaster face of control joint.

1. Install control joints over any existing control joints identified in the stucco replacement process.

2. Install control joints at all transitions from structural clay tile pre, such as concrete or concrete masonry units. Anchor control

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C. Cornerite (Interior Corner Reinforcement): Fabricated from metal lath with ASTM A653/A653M, G60 (Z180), hot-dip galvanized-zinc coating.

Provide at all interior corners.

D. External (Outside) Corner Reinforcement: Fabricated from metal lath with ASTM A653/A653M, G60 (Z180), hot-dip galvanized-zinc coating.

Provide at all exterior corners.

E. 7/8 inch Cornerbeads: Fabricated from zinc-coated (galvanized) steel.

1. Smallnose cornerbead with expanded flanges; use unless otherwise indicated on construction documents.

2. Smallnose cornerbead with expanded flanges reinforced by perforated stiffening rib; use on columns and for finishing unit masonry corners.

F. 7/8 inch Casing Beads: Fabricated from zinc-coated (galvanized) steel;

square-edged style; with expanded flanges.

1. Provide wherever stucco meets a dissimilar material (ie: window frames, door frames or wood trim) and as a termination member at the base of walls.

2. For base of wall installation, provide at base of all walls that are receiving new stucco, including partial height ramp and stair walls.

2.3 FASTENERS

A. Tie, wire, screws, staples, clips, nails, and other fasteners as required for attachment of stucco accessories, ASTM C1063, except as otherwise specified.

B. Provide fasteners for securing metal plastering bases having heads, or inserted through washers large enough to engage two (2) strands (two

(2) on each side of screw) of the metal plastering base.

C. Screws: ASTM C1002.

D. Expansion Shields: CID A-A-55615, of the Type and Class applicable.

2.4 CEMENT

A. Portland: ASTM C150/C150M, Type I.

2.5 LIME

A. ASTM C207, Type S.

2.6 AGGREGATES (SAND)

A. ASTM C897, graded as required to suit texture of finish specified.

2.7 BONDING AGENT

A. Meet or exceed all requirements of ASTM C932.

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B. Bonding agent must be visually tinted (example, blue or pink) to verify uniform coverage across existing substrate.

C. PVA Polyvinyl acetate homopolymers that re-emulsify upon re-wetting are prohibited.

D. Water resistant

E. Use only where existing substrate conditions warrants the use, as described in these specifications.

2.8 DASH-BOND COAT

A. Rich, fluid slurry proportioned as follows:

1. 1 part Portland Cement (ASTM C150, Type I or II).

2. 1 1/2 parts clean, sharp plastering sand (ASTM C144).

3. Potable water, added in sufficient quantity to achieve a thick, cream-like fluid consistency capable of being splattered or dashed

2.9 FACTORY PREPARED FINISH COAT FOR CEMENT PLASTER(STUCCO)

A. Factory prepared dry blend of materials, integrally colored, designed for exterior finish coat application.

B. Pigments: ASTM C979/C979M, lime proof mineral oxide.

C. Particle Size: Not more than 35 percent, by weight of all ingredients, including cement, aggregate, hydrated lime, admixture and coloring pigment is to pass a number 100 sieve.

2.10 ADMIXTURES

A. Do not use Air Entrainment (ASTM C260/C260M) with direct-applied systems.

PART 3 - EXECUTION

3.1 METAL PLASTERING BASES (LATH) LOCATIONS

A. Metal plastering bases are generally not required for direct-applied 3-coat stucco systems over structural clay tile or concrete masonry unit substrates. However, they shall be installed:

1. As control joints, where there are wall transitions between different materials (from CMU to Structural Clay tile or cast-in-place concrete.

2. Where the masonry substrate has extensive surface defects, large repairs or severe irregularities that prevent a direct bond. As the condition of the substrate is not known, base bid shall include cost to install a metal lath backed system, mechanically attached to the substrate, should field tests and/or field conditions indicate the substrate is not sound.

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3. Damage caused to the existing substrate due to Contractor’s method of existing stucco assembly removal, substrate cleaning and prep work shall be remediated by the Contractor at no additional cost to the VA and in a method approved by the VA, even if that means the stucco system assembly changes to a different type with additional/different required system components and accessories.

4. In distinct locations such as base of wall (casing bead), around the perimeter of doors, windows and other terminations (casing bead/plaster stops), corner beads, striplath at corners of wall openings, and control joints.

B. Re-stucco work not required on entrance canopy soffit unless patching is required caused by damage during demolition or construction processes. Patch to match existing condition.

C. Additionally, the cost for metal lath over all substrates and all associated necessary fasteners, prep work and accessories, shall be included in the base bid as the exact condition of the substrate is not known.

3.2 APPLYING METAL PLASTERING BASES

A. In accordance with ASTM C1063, except as otherwise specified or indicated on construction documents.

B. Form true surfaces, straight, without sags or buckles and with long dimension of lath at right angles to direction of supports.

C. Terminate lath for ceiling or soffit construction at casing bead

(floating angle construction) at perimeter angles between walls and ceilings or soffits.

D. Do not install continuous metal plastering bases through expansion and control joints. Terminate at each side of joint.

E. Attach metal plastering bases directly to concrete with hardened nails, power actuated drive pins or other approved fasteners. Install fasteners at valleys of dimples or crimps only.

F. Standard concrete nails are prohibited in attaching metal bases to structural clay tile substrate except when driven directly into solid mortar grout joints. Space fasteners at maximum of 7 inches on center along grout lines.

G. Wood plugs are not acceptable.

3.3 INSTALLING PLASTERING ACCESSORIES

A. Install accessories in accordance with ASTM C1063, except as otherwise specified.

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1. Set plastering accessories plumb, level and true to line, neatly mitered at corners and intersections, and securely attach to supporting surfaces.

2. Install in one (1) piece, within the limits of the longest commercially available lengths.

B. Corner Beads: External-corner reinforcement corner bead at all exterior corners, as required to establish grounds.

C. Casing Beads:

1. Provide at locations where shown on construction documents, where noted elsewhere in this specification and at locations where plaster terminates to provide finish trim:

a. Against non-plastered surfaces such as masonry, concrete, and wood.

b. Against trim of steel frames and trim of other materials and equipment, except where trim overlaps plaster.

c. Around perimeter of openings except where edge is covered by flanges. Locate to conform to dimensions shown on shop drawings.

d. Where plaster for new stucco’ d walls terminates against existing construction.

e. Both sides of expansion and control joints unless shown otherwise on construction documents.

f. As termination accessory at base of new stucco’d walls.

1) Install base casing bead 2 inches above paved surfaces and 4 inches above raw earth.

2. Provide at perimeter angles between walls and ceilings so as to provide floating angle (unrestrained) construction in accordance with ASTM C1063.

D. Cornerites:

1. Provide at interior corners of walls and other vertical surfaces to be plastered.

2. Do not fasten cornerites to structural clay tile walls. Embed cornerite in wet stucco scratch coat bed using a trowel. If fastening is absolutely necessary for proper alignment, embed fasteners in solid mortar joints between the tiles only.

E. Control Joints:

1. Install control joints mechanically fastened only to the concrete side at material transition with structural clay tile. Do not drive fasteners into the structural clay tile.

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2. Install centered over joints between dissimilar materials, such as hollow tile, brick, concrete masonry units, concrete, wood and joints with expanded lath on framing or furring, where both such surfaces are required to be plastered and are in contact with each other in the same plane, except where casing beads are required.

3. Extend joints the full width and height of the wall or length of soffit/ceiling plaster membrane.

3.4 SURFACE PREPARATION OF SOLID BASES

A. All surfaces to receive new stucco to have existing stucco assembly and any associated lath, building paper, fasteners and accessories completely removed in preparation for new stucco finish.

B. Surfaces that are to receive new plaster are to be prepared and conditioned in accordance with ASTM C926, except as otherwise specified.

C. Existing surfaces of concrete and masonry shall be prepared as follows:

1. Clean surface of dirt, oils, and other foreign matter which will prevent bond. Clean all extents of wall surface, removing all existing stucco assembly materials all the way down to soil and/or paved grade surface. Substrate shall be bare, untreated, unpainted, and porous without the use of a surface-applied chemical bonding agent, provided the substrate exhibits adequate suction.

D. Pre-wetting: Immediately prior to the application of the plaster scratch coat, heavily saturate the masonry wall thoroughly and uniformly with clean, potable water. Plaster shall be applied while the substrate is damp but free of standing or pooling water.

E. In lieu of mechanical fastening of metal wire lath or application of a chemical bonding agent, apply a cementitious dash-bond coat onto the bare substrate, prior to plastering over the substrate unless a bonding agent is determined necessary as described elsewhere in this specification. Application of a cementitious dash-bond coat and a chemical bonding agent are not to be applied together in the same location on the same substrate. Application of a dash bond coat is the default surface preparation approach and only to be replaced by a bonding agent if field conditions exist as described in the following paragraphs.

F. Bonding Agent application, in accordance with ASTM C932. A surface-applied chemical bonding agent shall be specified and applied in lieu of a dash-bond coat only when one or more of the following field

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a. A masonry or concrete surface substrate is smooth, dense, or non-porous, failing to provide adequate natural suction or mechanical key as determined by a water-droplet absorption test.

b. The substrate contains securely bonded non-water-soluable paint, glaze, or old plaster residue that cannot be completely removed by sandblasting, pressure washing, or mechanical scraping.

2. Verify that the substrate is clean, structurally sound, and completely free of dust, efflorescence, oil, grease, laitance, and remnants of the old stucco system.

3. Apply uniformly to the prepared substrate by brush, roller or spray equipment in strict accordance with the manufacturer’s written instructions.

4. Allow bonding agent to dry to the touch or cure to the film state as required by the product manufacturer prior to plastering.

5. Apply the first (scratch) coat of the three-coat stucco system within the maximum allowable open time specified by the bonding agent manufacturer.

6. If the bonding agent dries beyond the manufacturer’s recommended open time window or becomes contaminated with dust, reapply a fresh coat at no additional cost to the Owner.

3.5 PORTLAND CEMENT BASED PLASTER

A. Provide portland cement based plaster where cement plaster (stucco) is shown and specified, and as follows:

1. Three-Coat work is to be direct applied to the structural clay tile walls and terra cotta and concrete lintels.

2. Apply portland cement based plaster (stucco) finish to all wall opening sills, headers, jambs and (chimney) caps(match existing condition) in walls shown to receive new stucco finish in the drawings.

B. Proportion, mix and apply plaster in accordance with ASTM C926, except as otherwise specified.

1. Factory prepared finish coat: Add water, mix, and apply as specified by manufacturer to result in a dash textured finish to match the existing building. Field-applied dash texture permitted where factory prepared finish does not provide an adequate match to existing texture.

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2. Color: Match existing stucco color and dash texture on same building.

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