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Application Instructions For Backstop NT For Use Beneath Claddings Other Than Dryvit EIFS DS300 <br /> 4. Backstop NT- Spray Application <br /> a. General: Dryvit Backstop NT-Spray can be applied using appropriate spray equipment over the <br /> acceptable sheathing substrates. <br /> 1)Airless spray equipment must be capable of providing minimum 3000 psi and minimum material flow <br /> of 1 gallon per minute with a minimum .021 spray tip. <br /> NOTE: OSB sheathing requires that joints and fasteners be treated with Backstop NT-Texture. <br /> A minimum of two(2)coats of Backstop NT-Smooth or Spray are required for the field of the <br /> wall. Backstop NT-Texture is not recommended for application in the field of the board. <br /> b. Sheathing Substrates: All fastener heads shall be spotted, and joints treated with Backstop NT- <br /> Texture and Dryvit Grid Tape in accordance with Section IV.E.1 prior to Backstop NT-Spray <br /> application. <br /> 1) Backstop NT-Spray material should be applied in a uniform, continuous film at the recommended <br /> coverage rate free of voids and pinholes-Figure 5. NOTE: Sheathing substrates with a surface <br /> texture or high porosity will require additional material. <br /> Backstop NT- <br /> TeNure <br /> 8 ( • <br /> I i/ 4 Backstop NT- <br /> Spray <br /> Figure 5 <br /> c. Concrete/Masonry Substrates <br /> 1) Backstop NT-Spray may be applied to the wall using appropriate airless spray equipment and <br /> back-rolled using the appropriate nap roller(see Usage Application Chart). <br /> 2)Allow the Backstop NT-Spray to completely dry, check the wall to ensure that the Backstop NT- <br /> Spray is continuous and touch up any visible voids with additional material. <br /> d.Allow the Backstop NT-Spray to completely dry prior to installation of the specified cladding. <br /> V. Detailing at Transitions <br /> A. The Backstop NT membrane must be tied into all openings and penetrations to achieve continuity of the air <br /> barrier and it must be integrated with flashing material to eliminate water penetration. <br /> 1. Integration with flashing, openings and terminations <br /> a. Dryvit AquaFlash <br /> 1) May be applied directly over clean galvanized, painted metal,or PVC flashing. <br /> 2)Clean the surface of the flashing to ensure it is free of dirt, dust, oil, or other contaminants that may <br /> interfere with adhesion. Note: PVC products should be lightly abraded to break the surface skin and <br /> provide tooth for the coating. <br /> 3) Refer to Dryvit AquaFlash Application Instructions DS196 for application and sequencing. <br /> b. Dryvit Flashing Tape <br /> 1) Refer to Dryvit Flashing Tape Data Sheet DS450. <br /> 411,1 <br />