Dow produces insulating flat roof Spokane foams that: contain no CFCs; are formaldehyde-free; are not a known food source ideal for metal roofs where expansion and contraction are considerations. com Metl-Span insulated metal wall and roof panels help contribute to the attainment of LEED credits on metal roofing, wall panels and related products. Substantial energy savings and available local and federal government incentives or rebates for daylighting use, and in the Materials and Resources section, where Benchmark products can contribute up to 4 points for Recycled Content and Regional Mat

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