2) In case the popcorn predates about 1990, then it could likely have asbestos in it, which doubles or triples the price, and in several instances uncapsulating it with a spray coating and after that removing the drywall fully is in fact cheaper than each of the protective actions needed http://trackbookmark.com/story6648542/indicators-on-removing-asbestos-popcorn-ceiling-california-you-should-know