CUPA 50 is a non-carbonated slate formed by tectonic compression. Deep gray slate with thin laminations and very uniform smooth surface.
Split to an average thickness of 3/16” to 3/8”.
San Vicente Quarry, Villamartín de Valdeorras (Ourense) Spain.
Operating since 1999
8”x6” to 24”x12”
3/16” to 3/8”
|Value||ASTM Test Method||ASTM Grade|
|Modulus of Rupture||606 lbs, Ave. thickness 0.237 in||C120-19||S1|
|Weather Resistance||0.0007 in||C217-20||S1|
All Vermont Slate Company® roofing products meet or exceed ASTM C-406 S1 Standards
CUPA 50 roofing slate meets the following international standards:
C-121-20 (S1), C-120-19 (S1), C-217-20 (S1)
BS 680 Part 2