Brian G Posted May 4, 2005 Report Posted May 4, 2005 I did a house today with EIFS on the front and chimney chases. When I was in the attic I noticed that the substrate looked like drywall...never seen that before (usually OSB around here). It was at the very least made like drywall, with paper encasing a hard, white chalky substance, and the words "water resistant" stamped on it. It wasn't green or anything. Did any manufacturer use or allow such a substrate? What could it be other than some sort of wet location drywall? Brian G.
hausdok Posted May 4, 2005 Report Posted May 4, 2005 Hi, It's probably exterior grade drywall. I see it here used for exterior sheathing every once in a while - usually on condos and townhomes. OT - OF!!! M.
Jim Katen Posted May 4, 2005 Report Posted May 4, 2005 I call it gypsum sheathing. We see it a lot on commercial buildings. Lately, the paper on it's been yellow. Used to be tan. I have no idea what the colors signify. - Jim Katen, Oregon
Scottpat Posted May 4, 2005 Report Posted May 4, 2005 Brian, just about every EIFS manufacture allowed this type of substrate at one time. I have found it more on commercial buildings. Up in your area FL Craine & Sons would have done most of it from around 1993 to 1998 from what I have seen. One major problem was the delamination of the foam from the substrate. If nails were used they pulled out of the gypsum sheathing, if adhesives were used the paper face would pull loose from the gypsum. The better gypsum used a fiberglass reinforced paper over the gypsum (Glass Mat).
Brian G Posted May 4, 2005 Author Report Posted May 4, 2005 And I would've sworn a term like "exterior drywall" or "gypsum sheathing" was an oxymoron. Go figure. [:-dev3][][:-dev3] Mucho gracias gentlemen. Brian G.
Amn Posted May 5, 2005 Report Posted May 5, 2005 I agree with all of the aforementioned. One thing to add, you'll usually see some form of asphalt paper or moisture retarder on the outside of the gyp sheathing -even though the gyp is moisture resistant.
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