B09_Amend_0002_04_43_13_-_Stone_Masonry_0002.docx

SECTION 044313 - STONE MASONRY VENEER

PART 1 - GENERAL

SECTION INCLUDES

Natural stone veneers for field application.

Natural stone caps for field application

RELATED SECTIONS

Section 033000 - Cast-in-Place Concrete Section 040513 - Masonry Mortaring

REFERENCES

Masonry Veneer Manufacturers Association (MVMA): Installation Guide for Adhered Masonry Veneer.

SUBMITTALS

Submit to Contracting Officer.

Product Data: Manufacturer's data sheets on each product to be used, including:

Preparation instructions and recommendations.

Storage and handling requirements and recommendations.

Installation methods.

Cleaning and maintenance instructions.

Verification Samples: For each product specified, two samples, representing colors, patterns, textures, and finishes to be installed.

USGBC LEED Submittals: Submit manufacturer's documentation of the following items.

Product Data for Credit MR 5.1 and Credit MR 5.2: Submit data, including location and distance from Project of material manufacturer and point of extraction, harvest or recovery for main raw material.

Include statement indicating cost for each regional material and the fraction by weight that is considered regional.

Mock-Up: Provide a 18” x 2’ mock-up of wall.

QUALITY ASSURANCE

Mock-Up: Provide a mock-up for evaluation of preparation techniques and application workmanship.

Construct a separate (not part of the actual wall) sample wall panel not less than 2 feet by 2 feet with units in the pattern, color, texture, finish and shape as indicated on Drawings and specifications. Cleaning agents and methods shall be performed prior to approval of the sample panel.

Do not proceed with remaining work until workmanship, colors, patterns, textures, and finishes are approved by Contracting Officer.

DELIVERY, STORAGE AND HANDLING

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.

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

PROJECT CONDITIONS

Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.

Temperature and Weather:

Temperatures between 40 and 90 degrees F (4.4 and 32.2 degrees C) do not require special procedures or protection protocols.

When ambient temperatures fall below 40 degrees F (4.4 degrees C), utilize special construction procedures as recommended in MSJC Code and Specification for Masonry Structures.

Do not continue stone panel construction during heavy rains, as partially set or plastic mortar is susceptible to washout until 8 to 24 hours of curing occurs (depending upon environmental conditions).

When rain is likely, cover construction materials. Newly constructed stone panels shall be protected from rain by draping a weather-resistant covering over the assembly. The cover shall be secured in place and extend over all mortar that is susceptible to washout.

PART 2 - PRODUCTS

NATURAL STONE

Cutstack Flagstone Veneer Mortar Color: As indicated in Section 04 05 13 – Masonry Mortaring.

Shall match visitor center foundation stone wall.

Sandstone Cap Size: As indicated on the Drawings.

Mortar Color: As indicated in Section 04 05 13 – Masonry Mortaring.

Shall match visitor center foundation stone wall.

PART 3 - EXECUTION

PREPARATION

Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions. If preparation is the responsibility of another installer, notify Architect in writing of deviations from manufacturer's recommended installation tolerances and conditions.

INSTALLATION

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

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

Assembly:

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

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.

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.

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.

Expansion Joints: Do not bridge expansion joints, control joints and cold joints with setting material. Bring through the finished masonry work and filled with an approved elastomeric sealant.

Hot/Dry Applications (wetting the substrate): Under certain conditions, the substrate may need to be wetted. If the stone panel is being installed onto a very hot/dry surface or in a hot/dry climate, the wall surface shall be wet to prevent excessive absorption of moisture from the mortar. This can be done by spraying water on the wall surface.

Control Joints: Designed to reduce restraint and permit longitudinal movement. Per NCMA Tek Note 10-2C and 10-4, proper control joint spacing is required for all concrete masonry walls.

Mortar and Mortar Joints for Field Applications: Strike mortar joints when the mortar is thumbprint hard. Raked, flush, beaded, or extruded joints are not recommended by manufacturer as they do not compact the mortar and create ledges that intercept water running down the face of the wall.

During construction minimize mortar, grout, and concrete smears on the face of the units.

Curing: Allow to cure 24 hours before filling joints with Pointing Mortar, depending upon temperature and humidity.

Sealing: Not required.

CLEANING AND PROTECTION

Cleaning Procedures For Field Application:

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

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.

Protection: Protect installed work from damage due to subsequent construction activity on the site.

Strong acids, acid washes, chemicals with a strong acid reaction and abrasives may not be used, as they may etch the surface and distort color.

END OF SECTION 044313