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• 37 401, 12.0 Surface Treatment Options for Faswall®Wallforms Above Grade Faswall must be coated or faced with a weatherable surface to keep liquid water from penetrating. It is recommended that a design professional provide guidance specific to the site in order to ascertain an appropriate weather bather with adequate flashing so that there is prevention of moisture penetration through the wall and into the interior. 12.1 Air Barrier and Vapor Permeable Materials and Faswall® Wallforms When considering various surface finishes on the exterior of the Wallforms choose materials that will provide a good air bather but ALLOW the passage of water vapor. Air barrier products must be vapor permeable to allow for the free movement of water vapor though the hygroscopic Faswall®Wallform material. Air bathers need to be installed on both surfaces of the wall. Acceptable air bather products are: a parge coat of sand and Portland cement,stucco,plaster, dry wall, felt paper, or building wrap membrane products with a high perm rating such as Trek®. Coverings applied to both indoor and outdoor surfaces of the Faswall®Wallforms need to serve as effective air bathers and be vapor permeable. It is recommended that all cracks over 1/8"be sealed prior to the application of the continuous air barrier. 12.2 Stucco/Plaster General Recommendations The concrete infill in the Faswall®Wallform assembly needs to set and cure before stucco or plaster is applied to the Wallforms. Depending on climate and temperature,this process typically requires a minimum of 5-10 days,but may be as long as 28 days. Metal lath may be used but is not necessary since the wood fiber-cement composite is a striated structure allowing stucco to key into the surface of the wall forms. If there is a concern regarding cracking, fiberglass mesh pressed into the base coat of stucco provides more protection against cracking. Where Faswall®Wallforms are joined with other materials such as wood,metal,plastic,for example,around window and door openings,metal lath or fiber mesh should be used for proper bonding of the stucco/plaster. Window and door openings should be waterproofed and properly caulked to prevent infiltration around windows and doors. To ShelterWorks General Application and Technical Information(GATI)version 2.5