04_43_21_STONE_VENEER_ASSEMBLIES_R1_20250818_0005.pdf

Replace the Chisos Mountains Lodge and Rehabilitate the Chisos Basin Water System

Lodge Component

BIBE 259631-317515

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STONE VENEER ASSEMBLIES

SECTION 04 43 21 – STONE VENEER ASSEMBLIES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Thin stone veneer with grouted joints and venting at top and bottom, adhered to cement board sheathing over wood framing.

2. Thin stone veneer with grouted joints for interior installation.

B. Related Sections:

1. Section 06 10 00 – Rough Carpentry: Wall framing.

2. Section 07 27 26 – Fluid-Applied Membrane Air Barrier: Vapor permeable water resistive barrier.

3. Section 07 60 00 – Flashing and Sheet Metal.

4. Section 07 92 00 – Joint Sealants.

1.3 LEED REQUIREMENTS

A. Refer to Section 01 81 13 for LEED requirements related to this Section.

1.4 SYSTEM DESCRIPTION

A. Thin Stone Veneer Assembly (Exterior):

1. Adhered field stone.

2. Mortar bond coat with crack isolation membrane.

3. Cement board backing.

4. Perforated hat channels with venting at top and bottom of assembly.

5. Rigid mineral wool insulation. See Section 07 21 00.

6. Vapor permeable water resistive barrier. See Section 07 27 26.

7. Fiber wrapped concrete backer board.

8. Plywood sheathing. See Section 06 16 00.

1.5 ACTION SUBMITTALS

A. Product Data: For each type of product indicated.

B. Stone Samples for Verification: For each color, grade, finish, and variety of stone required.

C. Colored Mortar Samples for Verification: For each color required.

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D. Delegated-Design Submittal: Show compliance with performance criteria and applicable loads. Include calculations for subframing and cladding, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1.6 INFORMATIONAL SUBMITTALS

A. Qualification Data: For Installer.

1.7 QUALITY ASSURANCE

A. Installer Qualifications: An installer who employs experienced stone masons and stone fitters who are skilled in installing stone veneer assemblies similar in material, design, and extent to those indicated for this Project and whose projects have a record of successful in-service performance.

B. Professional Engineer Qualifications: A professional engineer who is legally qualified to practice in jurisdiction where Project is located and who is experienced in providing engineering services of kind indicated. Engineering services are defined as those performed for installations of stone assemblies that are similar to those indicated for this Project in material, design, and extent.

C. Source Limitations for Stone: Obtain each variety of stone, regardless of finish, from a single quarry with resources to provide materials of consistent quality in appearance and physical properties.

1. Obtain each variety of stone from a single quarry, whether specified in this Section or in another Section of the Specifications.

D. Source Limitations for Mortar Materials: Obtain ingredients of a uniform quality for each mortar component from a single manufacturer and each aggregate from one source or producer.

1.8 MOCKUPS

A. Build mockups to verify selections made under sample Submittals and to demonstrate aesthetic effects and qualities of materials and execution.

B. Build mockups for each type of stone veneer assembly in sizes approximately 48-inches (1200 mm) long by 48-inches (1200 mm) high by full thickness, including face and backup.

1. Include stone jambs and sills at window opening in mockup.

2. Include window flashing with a 12-inch (300-mm) length of flashing left exposed to view (omit stone veneer above half of flashing).

3. Include stone corner in mockup.

4. Include stone parapet wall cap configuration and flashing with 12-inch length of flashing left exposed to view.

C. Protect accepted mockups from the elements with weather-resistant membrane.

D. Approval of mockups is for color, texture, and blending of stone; relationship of mortar and sealant colors to stone colors; tooling of joints; and aesthetic qualities of fabrication and installation.

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Lodge Component

1. Approval of mockups is also for other material and construction qualities specifically approved by Contracting Officer in writing.

2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless such deviations are specifically approved by Contracting Officer in writing.

3. Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Deliver pre-blended, dry mortar mix in moisture-resistant containers designed for lifting and emptying into dispensing silo. Store pre-blended, dry mortar mix in delivery containers on elevated platforms, under cover, and in a dry location or in a metal dispensing silo with weatherproof cover.

B. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.10 SITE CONDITIONS

A. Protection of Stone Veneer Assemblies: During construction, cover tops of walls, projections, and sills with waterproof sheeting at end of each day's work. Cover partially completed stone veneer assemblies when construction is not in progress.

1. Extend cover a minimum of 24-inches (600 mm) down both sides and hold cover securely in place.

B. Stain Prevention: Immediately remove mortar and soil to prevent them from staining the face of stone veneer assemblies.

1. Protect base of walls from rain-splashed mud and mortar splatter by coverings spread on the ground and over the wall surface.

2. Protect sills, ledges, and projections from mortar droppings.

3. Protect surfaces of window and door frames, as well as similar products with painted and integral finishes, from mortar droppings.

4. Turn scaffold boards near the wall on edge at end of each day to prevent rain from splashing mortar and dirt on completed stone veneer assemblies.

C. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in ACI 530.1/ASCE 6/TMS 602.

PART 2 - PRODUCTS

2.1 STONE

A. Manufacturer:

1. Buechel Stone Corp.:

a. Style: Mosaic, Thin Veneer.

b. Color Name: Antique Copper Fieldstone, C97.

c. Special Shapes: Windowsills, parapet caps, transition cap between stone and fiber cement.

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B. Quartz-Based Dimension Stone Standard: ASTM C616, Classification II Quartzitic Sandstone.

1. Description: Ends irregular; natural split and rounded sides; bedface face and sawn back; stone is random shapes.

a. Color range: burnt tones, browns, buffs, black, red, mustard, occasional moss and lichen.

b. Color consistency: somewhat consistent.

c. Ends: Irregular – free form stone.

C. Nominal size range:

1. Length: 3 to 12-inches (76 to 304 mm)

2. Height: 3 to 12-inches (76 to 304 mm)

3. Width: 3/4 to 1-1/4-inches (19 to 31 mm)

D. Properties: ASTM C616:

1. Maximum absorption rate tested in accordance with ASTM C97: 3 percent.

2. Minimum density tested in accordance with ASTM C97: 2,400 kg per cubic meter.

3. Minimum compressive strength tested in accordance with ASTM C170: 68.9 Mpa.

4. Minimum flexural strength tested in accordance with ASTM C 880: 8.27 Mpa.

5. Solar Reflectance: 24.7 percent.

6. Thermal Emittance: 0.90.

7. Solar Reflective Index: 25.

2.2 MORTAR MATERIALS

A. Basis-of -Design- Mortar: Laticrete MVIS HI Bond Veneer Mortar.

1. Compressive strength (ANSI A118.4): >2500 psi (17.2 MPa)

2. Bond strength (ANSI A118.4): >450 psi (3.1 MPa)

3. Smoke & Flame Contribution (ASTM E84 Modified): 0

4. Total VOC Content: < 0.05 mg/m3

B. Portland Cement-Lime Mix: Packaged blend of Portland cement complying with ASTM

C150/C150M, Type I and hydrated lime complying with ASTM C207.

1. Mix: ASTM C270, 1,000 psi Type S using the Property Method.

2. VOC: 0 g/L.

C. Mortar for Stone Masonry: Comply with ASTM C270 Property Specification.

1. Limit cementitious materials in mortar to Portland cement, mortar cement, and lime.

2. Mortar for Setting Stone: Type S.

3. Mortar for Pointing Stone: Type N.

D. Latex Portland Cement Pointing Mortar / Grout: MVIS Pointing Mortar; weather, frost and shock resistant, as well as meeting the following physical requirements:

1. Compressive Strength (ASTM C91): 3500 psi (24.1 MPa)

2. Smoke & Flame Contribution (ASTM E84 Modified): 0.

3. Total VOC Content: < 0.00 mg/m3.

E. Basis of Design - Crack Isolation Membrane: Laticrete MVIS Air and Water Barrier.

1. Single component, load bearing, fluid applied, bulk water management and crack isolation membrane providing a seamless, monolithic elastomeric coating that is water-based and self-curing.

http://www.laticrete.com/Portals/0/datasheets/lds2280.pdf

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F. Water: Potable.

2.3 GROUT MATERIALS

A. Basis-of-Design: Laticrete PERRMACOLOR Grout.

1. Tensile Strength (28 Days): 510 psi (3.5 MPa).

2. Compressive Strength (28 Days): 4750 psi (32.8 MPa).

3. Flexural Strength (28 Days): 1400 psi (9.65 MPa).

4. Linear Shrinkage: (7 Days) 0.065%.

5. Water Absorption (28 Days): 3.25%.

2.4 CEMENT BOARD

A. Backer Board: Cementitious, water durable, board; surfaced with fiberglass reinforcing mesh on front and back; long edges wrapped; and complying with ANSI A118.9 and ASTM C1325:

1. Basis-of-Design: National Gypsum PermaBase BRAND Cement Board.

a. Thickness: 1/2-inch.

b. Width: As indicated on Drawings.

c. Length: As indicated on Drawings.

d. Edges: Round.

e. Compressive Strength: Not less than 2250 lbs. per sq. in. when tested in accordance with ASTM D2394.

f. Water Absorption: Not greater than 8 percent when tested for 24 hours in accordance with ASTM C473.

g. Surface Burning Characteristics: Class A.

1) Flame Spread: 0.

2) Smoke Development: 0.

h. Flexural Strength: ASTM C947; ≥ 1,750 lbf.

i. Fastener Holding (Wet and Dry): ASTM D1037; ≥ 90 lbs.

j. Freeze/Thaw Cycles: ASTM; C666 100.

k. Compressive Strength: ASTM D2394; N/A.

l. Thermal Resistance: ASTM C518; R = .2, K = 2.7.

m. Permeance: ASTM E96 > 10 perms.

n. Water Absorption (% of Weight): ASTM C47;3 < 8%.

o. Falling Ball Impact (12” Drop): ASTM D103;7 Pass.

p. Linear Variation with Change Moisture: ASTM D1037; ≤ 0.07%.

q. Mold Resistance: ASTM D3273; Score of 10.

r. Mold Resistance: ASTM G21; Score of 0.

s. Product Standard Compliance ASTM C1325

2.5 ACCESSORIES

A. Fluid-Applied Membrane Air Barrier: See Section 07 27 26.

B. Hat Channels:

1. Basis-of-Design: ClarkDietrich Building Systems; ProChannel Ci Cladding Support with Grip-Deck TubeSeal.

2. Horizontal Style: Perforated hat channel for ventilation and drainage.

3. Vertical Style: 1-inch Z-girts.

4. Minimum Base Metal Thickness: 16-gauge.

5. Depth: 7/8 inch (22.2 mm).

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6. Galvanized: ASTM A653/A653M, G180 galvanized perforated channels.

7. Fasteners: Supply fasteners of sufficient length and strength to span the space between hat channels and sufficiently penetrate substrate.

C. Compressible Filler: Pre-molded filler strips complying with ASTM D1056, Grade 2A1;

compressible up to 35 percent; of width and thickness indicated; formulated from neoprene.

D. Flashing: See Section 07 60 00 and as required to prevent water penetration and provide weathertight, complete, functional stone veneer installation.

E. Setting Buttons and Shims: Plastic.

F. Expansion and Control Joint Sealant: MVIS Silicone Sealant to be a one component, neutral cure, exterior grade silicone sealant and meet the following requirements:

1. Tensile Strength (ASTM C794): 280 psi (1.9 MPa).

2. Hardness (ASTM D751; Shore A): 25 (colored sealant) /15 (clear sealant).

3. Weather Resistance (QUV Weather-ometer): 10000 hours (no change).

G. Job-Mixed Detergent Solution: Solution of 1/2-cup (0.14-L) dry-measure tetrasodium polyphosphate and 1/2-cup (0.14-L) dry-measure laundry detergent dissolved in 1 gal. (4 L) of water.

2.6 STONE FABRICATION

A. General: Fabricate stone in sizes and shapes necessary to comply with requirements indicated, including details on Drawings.

B. Select stone to produce pieces of thickness, size, and shape indicated and to comply with fabrication and construction tolerances recommended by applicable stone association or, if none, by stone source, for faces, edges, beds, and backs.

1. Clean sawed backs of stone to remove rust stains and iron particles.

C. Gage backs of stones to be adhered with tile setting method if more than 81 sq. in. (522 sq.

cm) in area.

D. Thickness of Stone Veneer: 3/4” to 1-1/4”.

E. Dress joints (bed and vertical) straight and at right angle to face, unless otherwise indicated.

F. Shape stone for type of masonry (pattern) as follows:

1. Uncoursed rubble (fieldstone).

G. Finish exposed faces and edges of stone to comply with requirements indicated for finish and to match approved samples and mockups.

1. Finish: Natural cleft.

2. Finish for Sills: Sand-rubbed finish.

H. Carefully inspect stone at quarry or fabrication plant for compliance with requirements for appearance, material, and fabrication. Replace defective units before shipment.

http://www.laticrete.com/Portals/0/datasheets/LDS2330.pdf

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2.7 MORTAR MIXES

A. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.

1. Do not use calcium chloride.

2. Mixing Pointing Mortar: Thoroughly mix cementitious and aggregate materials together before adding water. Then mix again, adding only enough water to produce a damp, unworkable mix that will retain its form when pressed into a ball. Maintain mortar in this dampened condition for one to two hours. Add remaining water in small portions until mortar reaches desired consistency. Use mortar within 30 minutes of final mixing; do not re-temper or use partially hardened material.

B. Pre-blended, Dry Mortar Mix: Furnish dry mortar ingredients in the form of a pre-blended mix. Measure quantities by weight to ensure accurate proportions, and thoroughly blend ingredients before delivering to Project site.

C. Cement-Paste Bond Coat: Mix either neat cement and water or cement, sand, and water to a consistency similar to that of thick cream.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine surfaces indicated to receive stone veneer assemblies, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance.

1. Examine wall framing, sheathing, and underlayment to verify that installation will result in a weatherproof covering.

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Advise installers of other work about specific requirements for placement of reinforcement, flashing, and similar items to be built into stone veneer assemblies.

B. Accurately mark stud centerlines on face of underlayment before beginning stone installation.

C. Verify that back-up wall construction is complete, rigid, plumb, and ready to receive stone.

1. Verify that door and window openings and other penetrations are accurately located, sized, and adequately prepared for application of Stone veneer.

2. Verify built-in items are properly located and ready for roughing into masonry. Ensure built-in items are free of rust, ice, mud, and other foreign matter and that ferrous items are primed or galvanized.

3. Verify that mechanical and electrical services within walls have been installed, tested, and approved.

D. Stud framed wall:

1. Verify that sheathing substrate is:

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a. Securely installed with ends and edges over firm bearing.

b. Clean, dry, smooth, and free of voids, sharp edges, loose splinters, oil, grease, and other materials.

2. Fasteners are flush with surface of substrate.

E. Clean dirty or stained stone surfaces by removing soil, stains, and foreign materials before setting. Clean stone by thoroughly scrubbing with fiber brushes and then drenching with clear water. Use only mild cleaning compounds that contain no caustic or harsh materials or abrasives.

F. Report deficiencies to Contracting Officer and do not proceed with stone veneer installation until all deficiencies have been addressed.

3.3 SETTING OF STONE VENEER, GENERAL

A. Sort stone before it is placed in wall to remove stone that does not comply with requirements relating to aesthetic effects, physical properties, or fabrication, or that is otherwise unsuitable for intended use.

B. Coursing Patterns: Random rubble to match approved mock-up. Arrange stone pattern to provide color and uniformity, visual variations, blend of sizes, and regularity and neat appearance of joints. Exercise care to avoid concentration of any one color on any one wall surface. Do not use stacked vertical joints.

C. Arrange stones for good fit in uncoursed rubble pattern with joint widths within tolerances indicated.

D. Mortar Setting: Apply 1/2-inch (13 mm) bonding mortar to back of Stone veneer. Ensure complete coverage of back surface. Apply extra bed of mortar around all outside edges of stone. Press and wiggle stone firmly onto wall.

1. Work from bottom up.

2. Start at corners. Alternate installation of long and short ends of corner units in adjacent courses.

3. Maintain minimum 4-inch (101 mm) clearance from grade.)

4. Isolate top of veneer stone from horizontal structural framing members and slabs or decks with compressible joint filler and sealant in accordance with Section 07 92 00.

E. Joints: Lay stone with 1/2-inch (13 mm) approximate mortar joints.

1. Fill joints with mortar. Pack and work into voids.

2. When thumb-print hard, neatly tool to square joints, recessed 1/2-inch.

F. Remove excess mortar as work progresses to prevent staining.

G. Remove units disturbed after laying, clean, and re-lay with fresh mortar. If adjustments are required, remove units, clean off mortar, and reset with fresh mortar.

H. Exercise care that wet mortar is not splashed onto stone face during installation. Excess or splashed mortar shall be cleaned from face with dry burlap wipe. Remove excess after mortar becomes hard enough not to smear but prior to mortar setting.

I. Provide expansion, control, and pressure-relieving joints of widths and at locations indicated.

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1. Keep expansion and pressure-relieving joints free of mortar and other rigid materials.

2. Sealing expansion, control, and pressure-relieving joints is specified in Section

07 92 00 "Joint Sealants".

J. Install embedded flashing and weep holes at shelf angles, lintels, ledges, other obstructions to downward flow of water in wall, and where indicated.

1. At cold-formed metal-framed walls, extend flashing from exterior face of veneer, through the veneer, up the face of sheathing at least 8-inches (200 mm), and behind building paper or building wrap.

2. At lintels and shelf angles, extend flashing full length of angles but not less than 4-inches (100 mm) into masonry at each end.

3. At heads and sills, extend flashing 4-inches (100 mm) at ends and turn up not less than 2-inches (50 mm) to form a pan.

4. Extend sheet metal flashing 1/2-inch (13 mm) beyond face of masonry at exterior and turn flashing down to form a drip.

K. Ensure that sealant materials are not smeared onto stone faces. Remove as recommended by manufacturer.

L. After installation of Stone veneer, cut off excess weep materials flush with stone edge after mortar has set.

3.4 CONSTRUCTION TOLERANCES

A. Variation from Plumb: For vertical lines and surfaces, do not exceed 1/4-inch in 10 feet (6 mm in 3 m), 3/8-inch in 20 feet (10 mm in 6 m), or 1/2-inch in 40 feet (13 mm in 12 m) or more. For external corners, expansion joints, control joints, and other conspicuous lines, do not exceed 1/4-inch in 20 feet (6 mm in 6 m) or 1/2-inch in 40 feet (13 mm in 12 m) or more.

B. Variation of Linear Building Line: For position shown in plan, do not exceed 1/2-inch in 20 feet (13 mm in 6 m) or 3/4-inch in 40 feet (19 mm in 12 m) or more.

C. Measure variation from level, plumb, and position shown in plan as variation of the average plane of the face of each rough stone from level, plumb, or dimensioned plane.

D. Variation in Mortar-Joint Thickness: Do not vary from joint size range indicated.

E. Variation in Plane between Adjacent Rough Stones: Do not exceed one-half of tolerance specified for thickness of stone.

F. Variation in Plane on Face of Individual Rough Stones: Do not exceed one-half of tolerance specified for thickness of stone.

3.5 INSTALLATION OF ADHERED STONE VENEER ASSEMBLIES

A. Install flashing over sheathing and behind building paper or building wrap by fastening through sheathing into framing.

B. Install lath over building paper or building wrap by fastening through sheathing into framing to comply with ASTM C1063.

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C. Install scratch coat over metal lath 3/8 inch (10 mm) thick to comply with ASTM C926.

D. Coat backs of stone units and face of scratch coat with cement-paste bond coat, then butter both surfaces with setting mortar. Use sufficient setting mortar so a slight excess will be forced out the edges of stone units as they are set. Tap units into place, completely filling space between units and scratch coat.

E. Rake out joints for pointing with mortar to depth of not less than 1/2 inch (13 mm) before setting mortar has hardened. Rake joints to uniform depths with square bottoms and clean sides.

3.6 POINTING

A. Prepare stone-joint surfaces for pointing with mortar by removing dust and mortar particles.

Where setting mortar was removed to depths greater than surrounding areas, apply pointing mortar in layers not more than 3/8 inch (10 mm) deep until a uniform depth is formed.

B. Point stone joints by placing and compacting pointing mortar in layers not more than 3/8 inch

(10 mm) deep. Compact each layer thoroughly and allow to become thumbprint hard before applying next layer.

C. Tool joints, when pointing mortar is thumbprint hard, with a smooth jointing tool to produce the following joint profile:

1. Joint Profile: Smooth, flat face recessed 1/4 inch (6 mm) below edges of stone (raked joint).

3.7 ADJUSTING

A. Remove and replace stone veneer assemblies of the following description:

1. Broken, chipped, stained, or otherwise damaged stone. Stone may be repaired if methods and results are approved by Contracting Officer.

2. Defective joints.

3. Stone veneer assemblies not matching approved samples and mockups.

4. Stone veneer assemblies not complying with other requirements indicated.

B. Replace in a manner that results in stone veneer assemblies' matching approved samples and mockups, complying with other requirements, and showing no evidence of replacement.

3.8 CLEANING

A. In-Progress Cleaning: Clean stone veneer assemblies as work progresses. Remove mortar fins and smears before tooling joints.

B. Final Cleaning: After mortar is thoroughly set and cured, clean stone veneer assemblies as follows:

1. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.

2. Test cleaning methods on mockup; leave one-half of panel un-cleaned for comparison purposes. Obtain Contracting Officer’s approval of sample cleaning before cleaning stone veneer assemblies.

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3. Protect adjacent stone and non-masonry surfaces from contact with cleaner by covering them with liquid strippable masking agent, polyethylene film, or waterproof masking tape.

4. Wet wall surfaces with water before applying cleaner; remove cleaner promptly by rinsing thoroughly with clear water.

5. Clean stone veneer assemblies by bucket and brush hand-cleaning method described in BIA Technical Note No.20 Revised II, using job-mixed detergent solution.

6. Clean stone veneer assemblies with proprietary acidic cleaner applied according to manufacturer's written instructions.

C. Construction Waste Management: Manage construction waste in accordance with provisions of Section 01 74 19 Construction Waste Management and Disposal. Submit documentation for Credit MRp2/MRc5 to satisfy the requirements of that Section.

3.9 EXCESS MATERIALS AND WASTE

A. Excess Stone: Stack excess stone where directed by Contracting Officer for Government's use.

B. Excess Masonry Waste: Remove excess clean masonry waste and legally dispose of off Government's property.

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