USG REHABILITATION GUIDELINES FOR DAMAGED GYPSUM UNDERLAYMENTS
Poured gypsum concrete is beneficial for a few reasons: 1. Reduction in thickness. Poured gypsum can be poured at a minimum of ¾ in. (19 mm) instead of the 11/2 in. (38 mm) that lightweight concrete requires. 2. Poured gypsum sets and develops strength very quickly which can allow trade traffic to resume in as little as one day.