Frequently Asked Questions (FAQs) – Gypsum Association
According to ASTM C1396/C1396M Standard Specifiion for Gypsum Board, Section, "Gypsum board, except for predecorated gypsum board, is intended to be a substrate. The surfaces of gypsum board shall be true and free from imperfections that would render it unfit for finishing and final decoration. Gypsum board shall be installed and finished to the specified level in accordance with ...
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