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SlateTec Lightweight Slate Roof System

Roofing Slate Standards

The ASTM or American Society for Testing and Materials

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 known as the ASTM C406 which is now the “Standard Specification for Roofing Slate” world-wide. ASTM C406 addresses material characteristics, physical properties and sampling procedures appropriate for the selection of slate used as roofing shingles. There are three tests used as a basis for 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 roofing slate falls into the following three grades (dependent on geographic location and environmental exposure):

  • Grade S1 Slate –  expected service life of more than 75 years
  • Grade S2 Slate –  expected service life of 40 to 75 years
  • Grade S3 Slate –  expected service life of 20 to 40 years

SlateTec Lightweight Slate Roofs use only the highest quality S1 grade roofing slate. It weighs roughly 40% less than a traditionally installed slate roof yet it retains all the essential qualities that make slate the best possible option for any roof. Please call us anytime. Our design team can accommodate any custom or standard roofing project and help you choose from the many options available to build the perfect roof for you.

Genuine Roof Systems®

Genuine Roof Systems offer natural sophistication. From replacement roofs to new construction, our patented roofing system eliminates roughly 40% of materials needed in a traditional installation. This simple combination of our interlayment system and genuine materials makes for a roof that is easy to install, lighter weight, and cost-effective. And, our impressive warranties give you additional peace of mind that your most treasured asset is protected for a lifetime. We’re proud to offer you a free consultation. Click here to tell us about your project.

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