[BillinGlendaleCA]

Originally Posted by MichaelRyerson

Typically, they were sprayed on to a nice flat plastered ceiling. If one wanted, it was easy enough, although kinda dirty and time consuming, to scrape the cottage cheese off and, voila', nice flat plastered ceiling. Later they were sprayed on to sheetrock. They were thought to be sound dampening and somewhat fire retardant.

Also to make them extra fire retardant, they'd add asbestos to the mix. Yummy.