Browse Forums General Discussion What you are looking at is fibrous plaster, true gypsum, it is cast on horizontal beds with fibers included to give strength. I has no Asbestos in it. Houses before 1985… 2 7359 4 1893 That brown colour looks like Masonite or hardboard. Get it checked but typically asbestos was used in wet areas and plaster board or Masonite in other areas 1 254 |