Genuine Roof Systems

SlateTec by Genuine Roof Systems Slate standards are set by ASTM International, a non-profit, independent organization for standards development for building materials. In 1957, the ASTM established a consensus material standard for slate used for roofing applications. This material standard is designated as the    ASTM C406 which is now the “Standard Specification for Roofing material Slate.” ASTM C406 addresses material characteristics, physical properties, and sampling procedures appropriate to the selection of slate for use as roofing shingles There are three tests used as a basis to grading slate: Water Absorption of Slate C121 Weather Resistance of Slate C217 Flexure Testing of Slate C120 Based on these three tests, the ASTM C406 specifies whether the slate falls into the following three grades of roofing slate (dependent on geographic location and environmental exposure): Grade S1 Slate – has an expected service life of more than 75 years Grad...