HISTORIC - 1228 N Broadway - Plan

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ESR-5175 Page 3 of 8 instructions must be available on the jobsite during application. Installation must only be performed when the weather is dry and the ambient air temperature is between 60°F and 95°F (15.6°C and 35.0°C). Materials must not be applied if precipitation is occurring or expected. Substrates must be structurally sound, clean and dry, and must be sloped a minimum of 1/4 inch per foot (2% slope). 4.2 Preparation of Substrates: 4.2.1 Plywood: Plywood must be applied to framing in accordance with the requirements of the applicable code. All edges must be blocked. All penetrations through and terminations of the sheathing must be protected with metal flashing in accordance with the requirements of the applicable code and the manufacturer’s published installation instructions. 4.2.2 Concrete: Surfaces must be clean and free of standing water. All holes, joints and cracks must be pointed flush with portland cement mortar and all high spots cut or ground off to provide a smooth, even surface. Any foreign material such as paint, grease or oil must be removed by mechanical means. New concrete must be mechanically scarified prior to application of the system. 4.3 Systems A, B and C (Installation over Plywood – See Table 1): 4.3.1 Metal Lath: Metal lath, as described in Section 3.2.9 of this report, with staples described in Section 3.2.10, must be fastened to the plywood deck with 22 to 28 staples per square foot (0.09 m2), uniformly distributed. Where the lath is butt-jointed, the staple spacing at the joint must be no greater than 2 inches (51 mm) on center. Butt joints of metal lath must not occur over plywood joints. Where plywood joints occur, lath shall be stapled across all plywood joints at 4 inches (102 mm) on center. 4.3.2 Base Coat: The base coat must be one of the following: • Two one-gallon (3.8 L) containers of Dex-O-Tex A-81 Paste mixed with three 50-pound (34.0 kg) bags of Dex-O-Tex A-81 (A-81 Mortar) Powder. Coverage must be approximately 84 square feet (7.8 m2) per batch at a minimum thickness of 3/16 inch (4.8 mm). • One and a quarter gallon (4.75 L) of Dex-O-Tex Lath Mortar (LM) Liquid mixed with one 50-pound bag of Dex-O-Tex Lath Mortar (LM) Powder . Coverage must be approximately 43 square feet (3.99 m2) per batch at a minimum thickness of 3/16 inch (4.8 mm). • One gallon (3.8 L) of Dex-O-Tex G-26 Paste mixed with one 36-pound (16.4 kg) bag of Dex-O-Tex G-26 Matrix (Matrix Mortar) Powder must be approximately 23 square feet (2.1 m2) per batch at a minimum thickness of 3/16 inch (4.8 mm). The base coat must be trowel-applied to completely fill and cover the metal lath to a minimum total thickness of 3/16 inch (4.8 mm). The base coat must be allowed to cure a minimum of eight hours before application of the waterproofing layer. 4.3.3 Waterproofing Layer: Dex-O-Tex Barrier-Guard Membrane must be mixed with water at a ratio of 1:1 by volume, and the first coat must be roller-applied over the base coat at a rate of 1 gallon per 400 square feet (1 L/9.8 m2). Two additional coats of Dex-O-Tex Barrier-Guard Membrane (undiluted) must be applied with a 1/8-inch (3.2 mm) V-notched trowel, at a rate of 1 gallon per 64 square feet (1 L/1.6 m2), for a minimum total dry-film thickness of 0.025 inch [25 mils (0.64 mm)] for each coat. Each coat must be allowed to dry to the touch before the next coat is applied [approximately one hour at 70° F (21.0° C)]. Reinforcing fabric Dex-O- Tex RP Fabric must be embedded in the final coat and be allowed to cure for a minimum of four hours before application of the protection coat. 4.3.4 Protection Coat: Five gallons (18.9 L) of Dex-O-Tex Resistite Liquid must be mixed with two 55-pound (25.0 kg) bags of Dex-O-Tex Resistite Powder. Two coats of the protection coat must be applied over the waterproofing layer by trowel or texturing hopper gun at a rate of 1 gallon per 41 square feet (1 L/1.0 m2), for a minimum wet-film thickness of 0.039 inch [39 mils (0.99 mm)] for each coat. The first coat must be allowed to dry for four to six hours before the application of the second coat. The second coat must be allowed to cure for a minimum of eight hours before application of the topcoat. 4.3.5 Topcoat (Required for Systems A and B): Two coats of Dex-O-Tex AJ-44 XL must be roller-applied over the protection coat at a rate of 1 gallon per 300 square feet (1 L/7.4 m2), for a minimum wet-film thickness of 0.011 inch [11 mils (0.28 mm)] for each coat. The first coat must be allowed to dry for approximately one hour before application of the second coat. The second coat must be allowed to cure for a minimum of eight hours before application of the sealer.