{"id":1933,"date":"2018-12-13T15:32:31","date_gmt":"2018-12-13T21:32:31","guid":{"rendered":"https:\/\/www.slatetec.net\/?p=1933"},"modified":"2020-04-06T10:46:06","modified_gmt":"2020-04-06T16:46:06","slug":"roofing-slate-standards","status":"publish","type":"post","link":"https:\/\/slatetec.net\/roofing-slate-standards\/","title":{"rendered":"Roofing Slate Standards"},"content":{"rendered":"

The ASTM or\u00a0American Society for Testing and Materials.<\/strong><\/p>\n

Roofing slate standards are set by the ASTM International, an independent standards organization. Since 1957 the ASTM has established a consensus for building material standards. The\u00a0ASTM C406<\/em><\/strong>\u00a0is the world-wide\u00a0\u201cStandard Specification for Roofing Slate\u201d<\/strong><\/em>. It addresses material characteristics and physical properties of the roofing slate, among other things that are important for testing. There are three tests used for grading slate:<\/p>\n