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37 <br /> L <br /> 12.0 Surface Treatment Options for Faswall®Wallforms Above Grade <br /> Faswall must be coated or faced with a weatherable surface to keep liquid water from <br /> penetrating. <br /> It is recommended that a design professional provide guidance specific to the site in order to <br /> ascertain an appropriate weather barrier with adequate flashing so that there is prevention of <br /> moisture penetration through the wall and into the interior. <br /> 12.1 Air Barrier and Vapor Permeable Materials and Faswall® Wallforms <br /> When considering various surface finishes on the exterior of the Wallforms choose materials that <br /> will provide a good air bather but ALLOW the passage of water vapor. <br /> Air barrier products must be vapor permeable to allow for the free movement of water vapor <br /> though the hygroscopic Faswall®Wallform material. Air barriers need to be installed on both <br /> surfaces of the wall. Acceptable air barrier products are: a parge coat of sand and Portland <br /> cement, stucco,plaster, thy wall, felt paper, or building wrap membrane products with a high <br /> perm rating such as Tyvek®. Coverings applied to both indoor and outdoor surfaces of the <br /> Faswall®Wallforms need to serve as effective air barriers and be vapor permeable. It is <br /> recommended that all cracks over 1/8"be sealed prior to the application of the continuous air <br /> barrier. <br /> 12.2 Stucco/Plaster General Recommendations <br /> The concrete infill in the Faswall®Wallform assembly needs to set and cure before stucco or <br /> plaster is applied to the Wallforms. Depending on climate and temperature, this process <br /> typically requires a minimum of 5-10 days, but may be as long as 28 days. <br /> Metal lath may be used but is not necessary since the wood fiber-cement composite is a striated <br /> structure allowing stucco to key into the surface of the wall forms. If there is a concern <br /> regarding cracking, fiberglass mesh pressed into the base coat of stucco provides more <br /> protection against cracking. Where Faswall®Wallforms are joined with other materials such <br /> as wood, metal,plastic, for example, around window and door openings,metal lath or fiber mesh <br /> should be used for proper bonding of the stucco/plaster. Window and door openings should be <br /> waterproofed and properly caulked to prevent infiltration around windows and doors. To <br /> ShelterWorks General Application and Technical Information(GATT)version 2.5 <br />