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BACKSTOP® NT TM DS455 A High Performance, Polymer-Based, Noncementitious v Water-Resistive Membrane and Air Barrier Description Coverage Acceptable Substrates Backstop NT is a flexible, polymer- Backstop NT-Texture and All sheathing substrate joints must based, noncementitious,air/water- Smooth are supplied in a 5 gal be treated with Dryvit Grid Tape resistive barrier,which resists (19 L) pail. Backstop NT-Spray and Backstop NT-Texture prior to water penetration, eliminates air is supplied in a 5 gal (19 L) pail or application over the full sheathing infiltration, and is vapor permeable. in a 55 gallon (280 L)drum. surface.Acceptable substrates It is classified as a Class III vapor Coverage will vary, depending on include: retarder over vertical above grade application method and substrate. a. Core treated exterior grade walls. Backstop NT is available in For guidance refer to the usage gypsum sheathing meeting three versions: chart included in this document. ASTM C 1396(formerly C 79). • Backstop NT-Texture is b. Core treated exterior grade applied using a trowel, roller, Properties gypsum sheathing with or texture spray equipment. Working Time-Backstop NT- fiberglass mat facers meeting • Backstop NT -Smooth is Texture, Smooth and Spray are ASTM C 1177. applied by roller or texture noncementitious, water based c. Exterior fiber reinforced cement spray equipment. materials and will not set-up in the or calcium silicate boards. • Backstop NT -Spray is pail. Keep pail covered when not in d.APA Exterior or Exposure 1 applied by airless spray use to minimize skinning. Rated Plywood, Grade C-D or equipment. Drying Time-The drying time is better, nominal 1/2 in(12.7 mm) dependent upon the air minimum, installed with the C Uses temperature,wind conditions and face out. Backstop NT-Texture, Smooth relative humidity. Under average e. APA Exterior Grade Fire and Spray are designed for use drying conditions[70 °F (21 CC), Retardant Treated Plywood, with Dryvit EIF Systems as well as 55% R.H.], Backstop NT will be dry nominal 1/2 in (12.7 mm) other building cladding systems. to the touch within 2 hours and minimum, installed with the C ( When used with the Dryvit cure in 6 hours. face out. v AquaFlash®System or Dryvit f.APA Exposure 1 Rated OSB, Flashing Tape TM, Backstop NT Testing Information nominal 1/2 in(12.7 mm) provides an effective air barrier For test data refer to the chart minimum. Note:Applications and water-resistive membrane for included with this document. over OSB sheathing requires a acceptable substrates. minimum of 2 coats of Application Procedure For Backstop NT-Smooth or Benefits complete application Spray.Backstop NT-Texture Backstop NT is a low VOC water- instructions, refer to, DS181. is not recommended for the based product used straight out of field of wall application over the pail after an initial spin up to Job Conditions OSB. provide a continuous membrane Air and surface temperature for 9 Unpainted, unsealed concrete with ease of application. The liquid application of Backstop NT must and CMU. applied coating dries quickly and be from 40 °F (4 °C) minimum to Surface Preparation serves as an excellent surface for 100 °F(38 °C) maximum and must adhesively attaching EPS. remain so for a minimum of • Sheathing board gaps shall not Backstop NT is seamless and will 12 hours. exceed 1/4 in (6.4 mm)and the not tear. Additionally, it is stable surface must be flat within 1/4 in under air pressure differences and Temporary Protection (6.4 mm)in any 4 ft(1.2 m) will not be affected by wind. Shall be provided at all times until radius. CMU mortar joints shall membrane is dry and shall not be be struck flush(tooled mortar Packaging exposed to weather for longer than joints and heavily textured CMU Backstop NT-Texture and 180 days prior to installation of the [not split faced] shall be Smooth are supplied in 5 gal specified cladding. skimmed with Dryvit Genesis®, (19 L) pails. Backstop NT- Spray Genesis®DM or Genesis®DMS) is supplied in a 5 gal (19 L) pail or prior to application of the in a 55 gallon (280 L)drum. Backstop NT-Texture or Spray.