QUALITY & STANDARDS COMPLIANCE
50
YEAR WARRANTY
All slates are produced under strict quality control. Our clients put them into test referring to BS EN 12326 and ASTM C 406, they are compliant with requirements in standards and A1-S1-T1 rated. 75 years will be expected to last for roofing.
BS EN 12326-1:2004
BS EN 12326-1:2004 is the new European standard for slate and stone products for discontinues roofing or cladding. This replaces the old BS 680- 2:1971. The product specification is mainly established against a series of tests described in BS EN 12326-2: 2000 + A1 Slate and stone products for discontinuous roofing- Part 2 Methods of test. The A1 indicates that it includes amendments dated July 2004.
ASTM C 406
The American Society for Testing and Materials( ASTM), is a free acting society, with the goal of keeping a high national standard for materials. The ASTM standards for slate are somewhat regulated by members of the National Slate Association( NSA) with members from leading American quarries.-C119: Terminology Relating to Dimension Stone-C120 / C120M: Test Methods of Flexure Testing of Slate( Breaking Load, Modulus of Rupture, Modulus of Elasticity)-C121 / C121M: Test Method for Water Absorption of Slate-C217 / C217M: Test Method for Weather Resistance of Slate ASTM tests slate in three categories. 1) Breaking Load. 2) Water Absorption. 3) Depth of Softening. Based on these three tests, Slate is put into 3 categories. A. ASTM C 406 Grade S1: Expected service life in excess of 75 years. B. ASTM C 406 Grade S2: Expected service life 40-75 years. C. ASTM C 406 Grade S3: Expected service life 20-40 years.
QUALITY
9
ROOFING SLATE