Attachment 15 Stone Masonry Veneer.docx

PART 1 GENERAL

1.01 SECTION INCLUDES

SECTION 04 4313 STONE MASONRY VENEER

STONE MASONRY VENEER

A. Anchored cut stone veneer at exterior sign.

B. Accessories for adhered veneer.

C. Setting mortar.

1.02 REFERENCE STANDARDS

A. ASTM D226/D226M - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing; 2009.

B. ASTM E2556/E2556M - Standard Specification for Vapor Permeable Flexible Sheet Water-Resistive Barriers Intended for Mechanical Attachment; 2010 (Reapproved 2016).

1.03 SUBMITTALS

A. See Section 01 3000 - Administrative Requirements, for submittal procedures.

B. Product Data: Provide data on stone units, mortar, and reinforcement.

C. Samples: Submit mortar color samples.

1.04 MOCK-UP

A. Construct stone wall mock-up, 10 feet long by 10 feet wide; include stone anchor accessories, corner condition, and typical control joint in mock-up.

B. Locate as indicated on drawings.

C. Mock-up may remain as part of the Work.

1.05 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store and handle materials and products in strict compliance with manufacturer's instructions and recommendations. Store materials within manufacturer's recommended limits for temperature and humidity. Protect from damage.

B. Store products in manufacturer's labeled packaging until ready for installation.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Acceptable Manufacturer: Montana Rockworks 1107 Rose Crossing; Kalispell, MT 59901; 206-752-7625; www.montanarockworks.com.

B. Substitutions: See Section 01 6000 - Product Requirements.

2.02 THIN NATURAL STONE VENEERS FOR FIELD-APPLICATION

A. Thin Natural Stone Veneers: For field application as distributed by Montana Rockworks.

1. Cut Style: Ledge

2. Color: Moose Mountain.

3. Corners: Cut corner units.

B. Reinforcing: ASTM C 847, 2.5lb/yd2 (1.4kg/m2) galvanized expanded metal lath ASTM C 847, 3.4lb (1.8 kg/m2) galvanized 3/8” rib lath ASTM C 1032, 17 gauge (1.3 mm) woven wire mesh ASTM C933 Welded Wire Lath complying with code agency requirements for the type of substrate over which stone veneer is installed.

C. Mortar:

1. Cement: Portland cement complying with ASTM C 1329.

2. Lime: ASTM C 207.

3. Sand: ASTM C 144, natural or manufactured sand.

4. Color Pigment: ASTM C 979, mineral oxide pigments.

5. Water: Potable.

6. Pre-Packaged Latex-Portland Cement Mortar: ANSI A118.4.

2.03 MORTAR MIXES

A. Scratch Coat Mortars – Scratch coat mortars are applied directly to the lath or substrate to which AMSV systems are adhered. As the name implies, this first layer of mortar is intentionally scratched or roughened before hardening to provide enhanced mechanical bond between the scratch coat and setting bed mortars. Recommendations for the scratch coat mortar are as follows:

1. Site Mixed: Meets the requirements of ASTM C270 Type N or Type S.

2. Preblended: Meets the requirements of ASTM C1714/C1714M Type N or Type S.

B. Setting Bed Mortars – After the scratch coat mortar has cured sufficiently, the setting bed mortar is used to adhere the AMSV units to the backing. The setting bed mortar is applied directly to the scratch coat or to the back of the AMSV units (back-buttering), or a combination of both application methods. Recommendations for setting bed mortars based on specific applications are described as follows in Table 2.

C. Pointing Mortars – Pointing mortars, also referred to as grouting mortars or mortar used to grout mortar joints, are used to fill the joints between individual AMSV units once the setting bed mortar has sufficiently cured. Not all AMSV systems incorporated mortar between the units, while others allow the distance between units to be varied to create alternative architectural finishes. Recommendations for the pointing mortar are as follows:

1. Site Mixed: Meets the requirements of ASTM C270 Type N or Type S.

2. Preblended: Meets the requirements of ASTM C1714/C1714M Type N or Type S.

2.04 ACCESSORIES - ADHERED VENEER

A. Approved lath options include:

1. 2.5 lb/yd2 (1.4 kg/m2) (or heavier) self-furring metal lath meeting ASTM C847.

2. 3/8 inch (9.5 mm) rib (high rib), 3.4 lb/yd2 (1.8 kg/m2) (or heavier), self-furring metal lath meeting ASTM C847.

3. Welded wire lath complying with ASTM C933.

4. 18 gauge (or heavier) woven wire lath meeting ASTM C1032.

5. Non-metallic lath complying with ASTM C1788.

6. Alternate lath products showing compliance with ICC-ES AC 275, or equivalent.

B. Water-Resistive Barrier: ASTM D226/D226M or ASTM E2556/E2556M.

C. Weep Screeds and Casing Beads:

1. Weep screeds and casing beads must be corrosion resistant, with weep screeds having a minimum vertical attachment flange of 3.5 inches (89 mm) that terminates behind the water resistive barrier (if present). The minimum thickness of metal weep screeds and casing beads should not be less than 0.0179 inches (0.45 mm) (26 gage). For plastic weep screeds or casing beads, the minimum thickness is 0.050 inches (1.3 mm).

D. Flashing:

1. All flashing and flashing accessories must be corrosion resistant and integrated with the WRB materials (if present). For exterior applications, flashing must be installed at all through-wall penetrations and at lower boundaries of AMSV installations. Flashing is not required for interior applications of AMSV systems not exposed to water. For interior applications that are exposed to water, treat as an exterior assembly.

2. In some applications, the use of self-adhering flashing, also known as flashing tape, can be used. It is recommended that applicable building codes as well as manufacturer's instructions are reviewed and followed to ensure they are permissible for the given project or application. Additionally, the manufacturer of the AMSV should be contacted prior to construction to ensure the compatibility of the two products.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install stone thin veneers in accordance with manufacturer's written instructions and recommendations.

1. For Field Applications: Install according to the Masonry Veneer Manufacturers Association Installation Guide for Adhered Masonry Veneer and local building codes.

B. Assembly:

1. Units shall be mixed from several boxes at a time to insure proper color blending; includes flats and corners.

2. Surfaces for application shall be structurally sound, clean, dry and free from contaminants that would prevent a good bond. Newly prepared concrete shall be cured for 28 days and then troweled smooth and textured to a fine broom finish. Existing surfaces shall be scarified and leveled, and all defects shall be repaired. Glossy or painted surfaces shall be sanded, stripped and cleaned of waxes, dirt and other contaminants.

3. Installation shall comply with the requirements of all applicable local, state and federal code jurisdictions. Stone panels shall only be applied to structurally sound surfaces incorporating good building practices.

4. Cementitious Surfaces: Concrete or plaster shall be fully cured and shall accept water penetration. Test by sprinkling water on various areas of the substrate. If water penetrates, a good bond may be achieved; if water beads, surface contaminants are present, and loss of adhesion may occur. Contaminants shall be mechanically removed before installation. Concrete shall be free of efflorescence and not subject to hydrostatic pressure.

5. Plywood Substrates: Plywood substrates shall be structurally sound and shall meet all local building codes and ANSI deflection requirements.

6. General waterproof membrane (ANSI 118.10): Follow the waterproof membrane manufacturer's recommendations.

7. Setting Material: Use a pre-blended polymer-modified mortar as a setting material following the manufacturer's guidelines, for use with stone panels

3.02 CLEANING AND PROTECTION

A. Cleaning Procedures For Field Application:

1. Clean stone panels as work progresses. Remove mortar fins and smears before tooling joints.

2. After 36 hours, wet the stonework down with water and then apply a mild cleaning detergent with a soft bristle brush to remove any dirt or mortar smear left from the installation. Do not use any type of acid or metal brush. Non muriatic acid cleaner as recommended by manufacturer. Comply with manufacturer's cleaning and sealing recommendations.

END OF SECTION

STONE MASONRY VENEER