The quality, performance and durability of roofing slate can vary enormously. The lifespan of slate in Australia may be as short as 10 years or longer than 150 years depending on...
Read More1. ASTM C406-06 – Standard Specification for Roofing Slate
The American Society for Testing & Materials (ASTM - see www.astm.org) was formed in 1898 but these days ASTM standards are truly international.
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