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ESR-3319 I Most Widely Accepted and Trusted Page 2 of 3 and 9-inch (102 mm and 229 mm) widths and must be 4.2 Exterior Sheathing or Substrate Preparation: stored in a dry location at temperatures no lower than 40°F Surfaces must be structurally sound and free of loose (4.4°C). material, voids, projections, or other conditions that may 3.3 AquaFlash: interfere with the installation of Dryvit Backstop NT or AquaFlash liquid is a flexible, water-based pot men AquaFlash. The substrate must be flat, and free of fins or material used in conjunction with AquaFlash Mesh toyseal planar irregularities greater than 1/4 inch in 4 feet (6.4 mm substrates around windows, doors and other openings, in 1219 mm). AquaFlash is also used to bridge across expansion/control 4.3 Coating Application: joints and substrate transitions. 4.3.1 Flashing: Rough openings must be wrapped with 3.4 AquaFlash Mesh: Dryvit AquaFlash by applying AquaFlash liquid to all AquaFlash Mesh is a nonwoven cloth reinforcement surfaces and immediately embedding AquaFlash Mesh in packaged in 4-inch (102 mm), 6-inch (152 mm)and 9-inch accordance with the manufacturer's published installation (229 mm)widths and used in conjunction with AquaFlash instructions. A second coat of AquaFlash liquid is applied liquid. over the AquaFlash Mesh to ensure a continuous, 3.5 Exterior Sheathing or Substrate: void-free membrane application. 3.5.1 AquaFlash flashing: When AquaFlash flashing 4.32 Water-resistive Barrier: Prior to application of material is used,the substrates may be: Backstop NT (Smooth or Texture) over the face of the sheathing substrate, Dryvit Grid Tape is applied along all • Glass-mat faced gypsum sheathing complying with joints in the sheathing and to comers and exposed edges ASTM C1177 and having a minimum1/2-inch (12.7 mm) at terminations that will not be covered with Dryvit thickness. AquaFlash or Dryvit Flashing Tape. The Dryvit Grid Tape • Exposure 1 plywood complying with U.S. DOC PS-1 or and fastener heads are covered with a layer of Backstop PS-2; or Exposure 1 oriented strand board (OSB) NT-Texture before application of the Backstop NT-Smooth U.S. DOC PS-2, and having a minimum or NT-Texture. A minimum of one coat of Backstop complying with rho-inch(11.1 mm)thickness. NT-Smooth or NT-Texture is required over gypsum sheathing, cement board or plywood substrates. A • Uncoated aluminum, minimum of two coats of Backstop NT-Smooth is required • PVC complying with ASTM D1784. over OSB substrate. A minimum of two coats of Backstop NT-Texture is required over concrete and concrete • Concrete and concrete masonry complying with the masonry. applicable sections of the applicable codes. 4.4 Curing and Drying: 3.5,2. [op NT Water-Resistive Barrier: When Backstopop NT NT water-resistive barrier coating is used, the The material must be allowed to dry for at least two hours substrates may be: before installation of the approved cladding. The minimum ■ Exterior-grade, water-resistant core gypsum sheathing dry thickness is 12 mils[0.012 inch (0.3 mm)]. Curing time complying with ASTM C1396 and having a minimum varies depending on temperature/humidity and surface Iz-inch(12.7 mm)thickness. conditions. During the curing, the material must be protected from rain and from temperatures below 40°F • Glass-mat faced gypsum sheathing complying with (4.4°C)for 24 hours. ASTM C1177 and having a minimum /2-inch(12.7 mm) 5.0 CONDITIONS OF USE thickness. • Cement board sheathin complying with ASTM C1325 The Dryvit Backstop NT and Dryvit AquaFlash described in and having a minimumg'/z-inch(12.7 mm)thickness, this report comply with, or are suitable alternatives to what is specified in, those codes listed in Section 1.0 of this • Exposure 1 plywood complying with U.S. DOC PS-1 or report,subject to the following conditions: PS-2 having a nominal /cinch (12.7 mm) minimum thickness, or Exposure 1 oriented strand board (OSB) 5.1 Installation must comply with this report, the complying with U.S. DOC PS-2 having a nominal manufacturer's published application instructions and The-inch(11.1 mm)minimum thickness. the applicable code. In the event of a conflict between ■ Concrete and concrete masonrycomplying with the the manufacturers published installation instructions P Y 9 and this report,this report governs. applicable sections of the applicable codes. 4.0 INSTALLATION 5.2 For water-resistive coatings used in EIFS applications, special inspections are required at the 4.1 General: jobsite in accordance with 2015 IBC Section 1705.16 Installation of Dryvit Backstop NT and Dryvit AquaFlash 1704.1(2012 IBC Section 1705.15,1 and 2009 IBC Section must comply with this report and the manufacturer's riot required For other applications,special inspections are published application instructions. When use is behind are required at the jobsite if installation is done by cement plaster(stucco), a single layer of Grade D building an installer or contractor trained by the manufacturer, paper or equivalent, to serve as a slip sheet, is required and a certificate of installation is presented to the over the dry Backstop NT. The manufacturers published code official at the completion of each project; otherwise, special inspections are required at the application instructions must be available at the jobsite at all times during installation. Relevant documents are jobsite in accordance with 2015 and 2012 IBC Section available at: 1705.1.1 (2009 IBC Section 1704.15). Duties of the ( inspector include verifying field preparation of v Dryvit application instructions materials, expiration dates, installation of Dryvit specifications components, curing of components, installation of joints and sealants, applied dry-film thickness and Dryvit details interface of coating material with fleshings.