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ESR-1757 Page 2 of 6 of liquid rubber latex polymers incorporating dehydrating powders, vulcanizers, and special aggregates. The total thickness of the material is 3/16 inch to 1/4 inch (4.8 mm to 6.4 mm). 4.0 INSTALLATION 4.1 General: Installation of the Dex-O-Tex Weatherwear must be in accordance with the manufacturer’s published installation instructions, the applicable code and this report. The manufacturer’s installation instructions must be available on the jobsite during application. Liquid components have a shelf life of one year and must be stored at temperatures above 32°F (0°C). The system must be installed only when the ambient temperature is above 32°F (0°C). Materials must not be applied if precipitation is occurring or expected. 4.2 Preparation of Substrates: Structurally sound, clean, dry substrates listed above must be prepared, as described below, prior to the application of the finish material. 4.2.1 Structural Concrete: The 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. Before the material is applied, the substrate must be carefully swept, or blown clean by high-pressure air to remove all dust or foreign material. Special care must be taken in the preparation and cleaning of all corners and edges. Foreign materials such as paint, grease and oil must be removed by either grinding or sandblasting, with new concrete surfaces acid-etched. Large areas to be covered are required to have control joints at maximum intervals not to exceed 20 feet (6096 mm) on center, with the control joint system worked out to meet all known deck stress–concentration points. The control joints must be cut in the same manner as for standard concrete construction, and then caulked. 4.2.2 Plywood Base Material: Plywood substrates must be minimum 5/8-inch-thick (15.9 mm) exterior-grade plywood, having a maximum span of 16 inches (406 mm), and with tongue-and-groove edges and ends blocked or all edges blocked, and face grain perpendicular to supports. The plywood must be supported along all edges, and adequately fastened to all bearings by means of countersunk wood screws, or screw nails equivalent to 8d ring shank nails spaced at 6 inches (152 mm) on center, or as otherwise required by the applicable code. The nails must have a minimum penetration into the beams or joists supporting the plywood as required by the applicable code. The plywood surface must be clean, dry and free of all foreign materials such as paint, grease, oil and dust. Cracks in the plywood and all panel butt joints are to be sealed using a caulking compound. 4.2.3 Steel: Steel surfaces, having sufficient rigidity to avoid excessive deflections or being solidly backed by a rigid substrate, must be cleaned of all dust, grease, oil, silicone, loose paint, etc. The surface must be sufficiently roughened to assure a good bond by sanding, grinding, etc., and the resultant dust must be carefully removed. 4.3 Class A Roof Covering over Plywood Deck: a. The plywood is described and installed as set forth in Section 4.2.2, at a maximum slope of 1/4:12 (2.1%). Plywood panel joints must be filled with joint compound consisting of one part Resistite paste to three parts Resistite powder, mixed by weight. Total minimum thickness is 9/32 inch (7.1 mm). b. One layer of Type IV, asphalt-coated, fiberglass base sheet complying with ASTM D 2178 must be applied to the plywood. The sheets must be nominally 36 inches (919 mm) wide by 56 yards (51.2 m) long and must weigh a minimum of 10.5 pounds per 100 square feet (0.5 kg/m2). The base sheet must terminate 2 inches (51 mm) from the perimeter, protrusions and other flashing areas, and must be lapped 2 inches (51 mm) at joints. c. Metal flashing must not be less than 0.019-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion- resistant steel and must be degreased before installation. The base sheet must lap over the horizontal flange of installed vents. d. A mixture of one part Resistite paste and 2.25 parts Resistite powder, by weight, must be applied to all exposed surfaces and extend 4 inches (102 mm) onto the adjacent base sheet. Coverage must be a minimum of 19 pounds per 100 square feet (0.9 kg/m2). e. Perimeter and flashing areas must receive a coating of Neobond II membrane liquid at a minimum rate of 30 pounds per 100 square feet (1.5 kg/m2).Loose-woven jute fabric, nominally 0.035 inch (0.9 mm) thick and weighing 7 ounces per square yard (237 g/m2), must be embedded into the wet Neobond II. The combined thickness of Neobond II and fabric must be approximately 0.07 inch (1.8 mm). Each coating must be dry (this normally requires 12 to 16 hours) before recoating.