Finally getting rid of the popcorn ceiling in our living room. Actually we will be encapulating it. I have not had good luck scraping popcorn ceilings flat, so we knocked down the texture and then will drywall over the existing. This will also give me a chance to run wire for recessed lighting and some accent lighting.

I will be gluing and screwing the new drywall to the existing. The joists are 16″ OC. Do you recommend 3/8 or 1/2 drywall?