A lot of popcorn ceilings mounted as late given that the mid-80s may include asbestos, so before starting this task, simply call an asbestos professional or take a look at the floor using an EPA-authorised check kit (the sample gathered with the kit needs to be mailed into a lab http://donovanzyphv.affiliatblogger.com/25966250/cost-to-remove-popcorn-ceiling-and-replace-with-knockdown-for-dummies