Okay, how about this…
Installed a new entry door today in an older house (built about 1940 I would guess) and most of the siding had been stripped off of one side, exposing the sheathing. The sheating appeared to be 1/2″ drywall with black paper on it. Anybody know what this was and if it was used extensively at some point? I do mostly new construction, and have never seen it before.
Are you sure it was a drywall composition and not like a fibreboard?
I've seen it. Where in Ohio? I'm in Dayton.
Yes in Dayton Ohio, Belmont area. It doesn't look like fiberboard to me, looks like drywall.
I think it was a late 50's thing, water resistant exterior gypsum sheathing. It seemes to hold up ok. I'm over by research park in Kettering, but I saw the stuff in Belmont. Maybe a local thing, it's not used here anymore that I know of. I didn't even know it was still available.
Edited 5/19/2003 4:25:02 PM ET by markh128
It is a gypsum sheathing product with an asphaltic impregnated paper and a wax emulsion core treatment for water resistance. Still available. Used as a non-structural underlayment for various sidings. Common here in the south behind the old cement/asbestos siding.