Yorkmont Slate Survives The Ages
A slate roof, over the long term, is one of the most cost-efficient investments that a building owner can make. A slate roof will outlast several generations of other roofing materials and the roofing slate produced in Vermont and New York will last an average of 75 - 100 years and requires little, if any maintenance over its entire life.
Roofing slates have specific weathering characteristics. Some slate is referred to as “unfading” in that the basic color will remain consistent after many years of exposure. The “semi weathering” and “weathering” slates will fade to usually shades of brown after a period of exterior use. The weathering characteristics do not impact the integrity or life of the roofing slate.
Roofing slate is sold by the square. A square of roofing slate is the specific quantity to cover 100 square feet of standard roofing surface when installed with a 3-inch head lap.
We manufacture ASTM Grade S-1 (highest quality) roofing slate.
ASTM Test Results: Red Slate
, C121-90 0.143%
ASTM max for S1 slate is 0.25%
Modulus of Rupture, C120/C120M-09
Across Grain: 13401 psi ASTM min. for Class I ext. slate 9000 psi
Along Grain: 10781 psi ASTM min. for Class I ext. slate 7200 psi
Weather Resistance, C217-94 0.0003 in. ASTM max. for S1 slate is 0.002 in.
For additional test results on our other roofing products please call toll-free at 1.877.HADEKAS.