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adding layer of drywall

  1. Drywall & Plaster
    I live in a 1st floor condo and I have decided to add green glue and a layer of 5/8" drywall to the entire ceiling and 2 shared walls. How do I extend the a/c grilles down an extra 5/8" to accomodate the new finish height? Do they sell extensions of some sort or do I just attach the finish...