ASTM for roofing slate

ASTM is the abbreviaton for 'American Standard Test Methods'. These standards define the important rock parameters and how they has to be tested, leading to a classification of quality. For roofing slate, the following norms are of importance:

• C 119 - Definition of Roofing Slate

• C 406 - Standard Specification for Roofing Slate

• C 120 - Standard Test Methods of Flexure Testing of Slate (Breaking Load, Modulus of Rupture, Modulus of Elasticity)

• C 121 - Test Method for Water Absorption of Slate

• C 217 - Test Method for Weather Resistance of Slate