Dryvit Backstop NT: 5 Gallon Membrane
Dryvit Backstop NT is a flexible, polymer- based, noncementitious, air/water-resistive barrier, which resists water penetration, eliminates air infiltration, and is vapor permeable. It is classified as a Class III vapor retarder over vertical above grade walls. Questions? Contact Us.
Dryvit Backstop NT is available in three versions:
• Backstop NT – Texture is applied using a trowel, roller, or texture spray equipment.
• Backstop NT – Smooth is applied by roller or texture spray equipment.
• Backstop NT – Spray is applied by airless spray equipment.
Backstop NT – Texture, Smooth and Spray are designed for use with Dryvit EIF Systems as well as other building cladding systems. When used with the Dryvit AquaFlash® System or Dryvit Flashing Tape™, Backstop NT provides an effective air barrier and water-resistive membrane for acceptable substrates.
Working Time: Backstop NT – Texture, Smooth and Spray are noncementitious, water based materials and will not set-up in the pail. Keep pail covered when not in use to minimize skinning.
Drying Time: The drying time is dependent upon the air temperature, wind conditions and relative humidity. Under average drying conditions [70 °F (21 °C), 55% R.H.], Backstop NT will be dry to the touch within 2 hours and cure in 6 hours.
Testing Information: For test data refer to the chart included with this document.
Application Procedure: For complete application instructions, refer to, DS181.
Job Conditions: Air and surface temperature for application of Backstop NT must be from 40 °F (4 °C) minimum to 100 °F (38 °C) maximum and must remain so for a minimum of 12 hours.
Temporary Protection : Shall be provided at all times until membrane is dry and shall not be exposed to weather for longer than 180 days prior to installation of the specified cladding.
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All sheathing substrate joints must be treated with Dryvit Grid Tape and Backstop NT – Texture prior to application over the full sheathing surface. Acceptable substrates include:
a. Core treated exterior grade gypsum sheathing meeting ASTM C 1396 (formerly C 79).
b. Core treated exterior grade gypsum sheathing with fiberglass mat facers meeting ASTM C 1177.
c. Exterior fiber reinforced cement or calcium silicate boards.
d. APA Exterior or Exposure 1 Rated Plywood, Grade C-D or better, nominal 1/2 in (12.7 mm) minimum, installed with the C face out.
e. APA Exterior Grade Fire Retardant Treated Plywood, nominal 1/2 in (12.7 mm) minimum, installed with the C face out.
f. APA Exposure 1 Rated OSB, nominal 1/2 in (12.7 mm) minimum. Note: Applications over OSB sheathing requires a minimum of 2 coats of Backstop NT – Smooth or Spray. Backstop NT –Texture is not recommended for the field of wall application over OSB.
g. Unpainted, unsealed concrete and CMU.