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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 […]
Synthetic roofing slate salesman claim: “[Synthetics] are shatter resistant unlike natural slate roofing that can shatter when walked upon or in cold weather.” link here SlateTec respands: S1 Grade Natural Roofing Slate is not affected by temperature in any way. Also, natural slate roofs are indeed walkable, as they have been for hundreds of years. […]
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, […]