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• BACKSTOP® NTTM FOR USE BENEATH DS806 (r, CLADDINGS OTHER THAN DRYVIT® EIFS A High Performance, Polymer-Based, Noncementitious Water-Resistive Membrane and Air Barrier Description Properties b. Core treated exterior grade Backstop NT is a flexible, polymer- Working Time—Backstop NT- gypsum sheathing with based, noncementitious, air/water- Texture, Smooth and Spray are fiberglass mat facers meeting resistive barrier,which resists noncementitious,water based ASTM C 1177. water penetration,eliminates air materials and will not set-up in the c. Exterior fiber reinforced cement infiltration,and is vapor permeable. pail. Keep pail covered when not in or calcium silicate boards. It is classified as a Class Ill vapor use to minimize skinning. d.APA Exterior or Exposure 1 retarder over vertical above grade Rated Plywood, Grade C-D or walls. Backstop NT is available in Drying Time—The drying time is better, nominal 1/2 in (12.7 mm) three versions: dependent upon the air minimum,4-ply. • Backstop NT-Texture is temperature,wind conditions and e. APA Exterior Grade Fire applied using a trowel, roller, relative humidity. Under average Retardant Treated Plywood, or texture spray equipment. drying conditions[70 T(21 °C), nominal 1/2 in(12.7 mm) • Backstop NT-Smooth is 55% R.H.], Backstop NT will be dry minimum. applied by roller or texture to the touch within 2 hours and f. APA Exposure 1 Rated OSB, spray equipment. cure in 6 hours. nominal 1/2 in (12.7 mm) • Backstop NT-Spray is minimum. (See limitations). Testing Information Un aimed, unsealed concrete applied by airless spray g. P equipment. For test data refer to the chart and CMU, included with this document. Uses Surface Preparation Sheathing Application Procedure • Backstop NT—Texture, Smoothgaps shall not and Spray are designed for use For complete application exceed 1/4 board in (6.4 mm)and the II with exterior building cladding instructions refer to DS300. surface must be flat within 1/4 in systems.When used with the Job Conditions (6.4 mm)in any 4 ft(1.2 m) Dryvit AquaFlash®System or radius. CMU mortar joints shall Dryvit Flashing TapeTM, Backstop Air and surface temperature for be struck flush(tooled mortar application of Backstop NT must NT provides an effective air barrier be from 40 °F (4 °C) minimum to joints and heavily textured CMU and water-resistive membrane for [not split faced] shall be acceptable substrates. 100 °F (38 °C) maximum and must skimmed with Dryvit Genesis®, remain so for a minimum of Genesis®DM or Genesis®DMS) Benefits 12 hours, prior to application of the Backstop NT is used straight out of Temporary Protection Backstop NT—Texture or Spray. the pail after an initial spin up to Shall be provided at all times until CMU shall be clean, unpainted provide a continuous membrane and free of efflorescence.All with ease of application. The liquid membrane is dry and shall not be substrates shall be dry and free applied coating is seamless and exposed to weather for longer than of foreign materials such as dirt, will not tear. Additionally, it is 180 days prior to installation of the dust, oil, paint,wax,water stable under air pressure specified cladding. repellents or other materials that differences and will not be affected inhibit adhesion. Acceptable Substrates by wind. All sheathing substrate joints must • All substrate transitions and be treated with Dryvit Grid Tape gaps between openings and Coverage and Backstop NT-Texture prior to penetration components such as Backstop NT—Texture and windows, doors,electrical boxes, application over the full sheathing Smooth are supplied in a 5 gal surface.Acceptable substrates etc.,shall be treated with (19 L)pail. Backstop NT—Spray Backstop NT-Texture, Dryvit include: is supplied in a 5 gal (19 L) pail or AquaFlash®, or Dryvit Flashing in a 55 gal (208 L) drum. Coverage a. Core treated exterior grade Taper". Any sealants used shall will vary, depending on application gypsum sheathing meeting be tested for compatibility and method and substrate. For ASTM C 1396(formerly C 79). comply with ASTM C 920. guidance refer to the usage chart t included in this document.