What type of drywall is this? It looks like plywood with a thin layer of drywall
>>2891528On the ceiling? No, that's just regular drywall. Can't see from the shitty pic but it looks like water has caused the paper to separate from the gypsum.
>>2891586It's actually plywood.
It looks like they applied a thin layer of plaster + paint, or a thick layer of paint directly to the plywood. Probably wasn't primed properly and moisture caused delamination.