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Do a scrape test before learning how to remove popcorn ceiling
Before you go to all the trouble of prepping the room, try scraping a small area while learning how to remove popcorn ceiling. Try it dry first, then dampen the texture with water and try again. Some texture comes off easily without water, but in most cases wetting is best. If the water doesn't soak in and soften the texture, the ceiling has probably been painted or paint was added to the texture mix. In that case, wetting the ceiling may not help, and you'll have to decide whether you want to tackle a really tough scraping job or choose another way to hide your popcorn ceiling.
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Test for Asbestos!
Any popcorn ceiling installed before 1980 might contain asbestos—a known cause of lung cancer. Before trying to figure out how to remove any popcorn ceiling texture, your local health department and ask about getting a sample tested. If the test comes back positive, cover the popcorn with new drywall or tongue-and-groove planks, or hire an asbestos abatement contractor to help in removing popcorn ceiling.