by Greenstone Slate News | Oct 31, 2017
All Greenstone slate colors have been tested and meet the S1 ASTM engineering specification, (ASTM C406*), which means they exhibit all the physical characteristics of the best quality slate available. Slate Colors Descriptions of slate colors can vary from supplier...
by Greenstone Slate News | Oct 3, 2017
The Greenstone Vermont slate siding accent on this residence was installed using traditional slate installation methods. The Benefits of Slate Siding Long-term investment: Slate is natural stone (Greenstone Slate® is ASTM rated S1, the highest possible rating) and...