Astm d3273 mold resistance testing in independent lab tests conducted on usg securock brand gypsum fiber roof board and securock glass mat roof board at the time of manufacture per astm d3273 standard test method for resistance to growth of mold on the surface of interior coatings in an environmental chamber both panels scored a 10. And usg securock brand ultralight glass mat roof board at the time of manufacture per astm d3273 standard test method for resistance to growth of mold on the surface of interior coatings in an environmental chamber both panels scored a 10. Up to 18 lighter than competitive products securock brand ultralight coated glass mat roof board is a high performance roof board for use in low slope commercial roofing systems.
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