GreenGlass is produced with the TemShield Mold Protection System engineered into its gypsum core and is faced on both sides with naturally mold- and moisture-resistant fiberglass mats. In addition, GreenGlass has been shown to resist water penetration when tested in accordance with ASTM E331. Install using rubberized asphalt tapes with a minimum 4" width (MFM Window Wrap, Fortiflash or Protectowrap) to seal all exposed joints and penetrations.
Some local codes for water-resistive barriers require sealing of joints and fasteners with reinforced tape combined with a flexible joint treatment. Refer to your local building code, the weather resistive barrier manufacturer's installation instructions, as well as project design specifications.
When tested in accordance with ASTM D3273, the standard test for mold resistance, GreenGlass scored a 10, the highest value possible. Its water absorption of less than 10 percent was tested in accordance with ASTM C473.
Note: The ASTM D3273 lab test may not be applicable to the actual performance of building materials. No material may be labeled mold proof, and resistance to mold growth depends on many factors. Prolonged exposure to moisture may cause mold and mildew to grow on any surface. Therefore, in order to maximize the mold and mildew resistance of a material, it is essential that good design, handling and construction practices be implemented. This involves avoiding water exposure during all phases of storage, handling, shipping, installation and after installation is complete. See GA238 for more information.