On Jul 13, 9:33 pm, "** Frank **" wrote:
I just replaced a damaged wall section with standard sheet rock. The
existing wall board was 1/2" thick, brown in color, fibrous and very light
weight with a cloth cover/reinforcement on the finish side. Its weight and
density is like the standard commercial 2'x4' fluorescent fixture light grid
tiles. The rest of the house is old plaster and lath and this brown wall
board was a latter addition. Don't think its a very good product to begin
with and never seen anything like this brown wall board before. Can anyone
provide more information?

It sounds like Beaver Board covered with wallpaper. Beaver Board was
a compressed pulp fiber board and was used for a number of purposes in
the early 20th century. Artists also used it instead of a stretched
canvas. http://www.bobvila.com/wwwboard/messages/264760.html

R