What are the structural and mold-resistant qualities relevant to EIFS for Densglass, Glassroc and gypsum board?
I assume that when you say gypsum board you are referring to gypsum sheathing and not gypsum board used for interior partitions. This assumption puts all the materials you are questioning into the exterior usage category. The fiberglass-faced sheathing boards will take exposure to the elements better than gypsum sheathing, which is a paper-faced product. AWCIs EIFSDoing It Right program has a method to test gypsum to determine delamination of the facing of the board to ensure damaged board is not used as a substrate for EIFS. The question of mold resistance is easy to answer. Most, if not all, of the fiberglass-faced products indicate a rating of 10 (the highest rating available) as a mold-resistance rating when tested in accordance with ASTM D3273/D3274. The structural integrity of the products is best determined by applying the requirements of the local building for the type of installation involved. I do not think a blanket answer will cover this situation. Most manufacturers of the
