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The ASTM or American Society for Testing and Materials. Roofing slate standards are set by the ASTM International, an independent standards organization. Since 1957 the ASTM has established a consensus for building material standards. The ASTM C406 is the world-wide “Standard Specification for Roofing Slate”. It addresses material characteristics and physical properties of the roofing slate, among other things […]
Is Natural Slate Roofing on the Decline? An Industry Split in Two: The Lightweight Slate Roofing industry is now well developed, and there are many companies offering a multitude of products. They all claim to be the “best alternative to traditional slate roofing”. There are two main categories within this industry. You have the synthetic slate […]
Synthetic slate roofing manufacturers claim: “If [synthetic] slates are not stored flat and become twisted or curled, lay them flat in a warm place and they will return to their original flatness.” link here Slatetec Responds: Three words: Hot windy days. SlateTec uses only the highest quality Vermont S1 grade slate, which will never fade, warp, […]