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