Protect surfaces that could be damaged during the stone installation process, such as hardwood flooring, window trim, and other areas that have already been finished. Stage material close to the installation area. Layout stones so they can be easily viewed and reached. It is important to obtain stones from multiple packages (boxes and/or crates) and organizes them by size, color, and texture. Opening all boxes and crates will facilitate random distribution. Moisture Control (Flashing-WRBs-Weep screed) Ensure surface is clean and free of any debris. Use Type-S mortar. It is important to not leave the scratch-coat surface smooth. Groove scratch-coat horizontally with a notched trowel. Scratch-coating can be done in its entirety before adhering stone, but it is also acceptable to “scratches-you-go”. Wire Lath/Mesh Use expanded, galvanized, diamond-mesh meeting requirements of ASTM C847-06 (min 2.5 lb/yd2 ). Install tightly, cups up (smooth when feeling from bottom to top, rough when felt top to bottom.) Overlap sections of lath approximately 1 inch. Fasten lath every 16” horizontally on-center, and maximum 6” vertically. Wrap corners minimum 16” (inside and outside corners.) WOOD STUDS: If anchoring to wood studs with screws, use washers, and ensure 1 inch of stud penetration. If anchoring with wide-crown staples, ensure staples will penetrate 1 inch deep. STEEL STUDS: If anchoring to steel studs, ensure 1/2 inch of steel penetration beyond the inside surface. Verify flashing is properly installed (roof, chimney, windows, door openings, etc.) Flashing should integrate with Water Resistive Barriers (WRB), overlapping weep screed flange.* WRB: 2 layers; house-wrap first, then felt the paper. * Install from bottom-up, overlapping min. 4 inches, horizontally and vertically. Weep screeds may or may not be required.* * Refer to local building codes. * Interiors (Over Drywall) Instead of using moisture resistant barrier and wire mesh system, cement board products can be used for interiors. (Exception: Interior water features require MRB.) Apply cement board, rough side out, over studs (drywall is not necessary, but can be left in place). Fasten cement board using corrosion-resistant screws every 16” horizontally on center, and minimum 6” vertically, ensuring minimum 1 inch of stud penetration. Tape cement board seams with fiberglass tape and seal seams with Thinset mortar. Ensure surface is clean and free of debris. Type-S (ASTM C270) should be used for all NSVI stone products unless drystacking (i.e. Ledgestone Collection). Consistency of mortar mix is important. If too wet or too dry, the mortar will not adhere to stone or substrate surface properly. It should stick to the trowel. NSVI recommends adding acrylic bonding agent to Type-S mortar. This enhances the flexural, adhesion, compressive, and tensile strength qualities. Thinset (ANSI 118.4) when tight-fitting NSVI stone (also see Pg. 6). Use medium-grade ThinSet or Use high-grade ThinSet when adhering stone to water features or when installing in a high moisture environment (i.e. pool, shower, bath, spa).