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Tips for a Quieter Ceiling
To quiet footsteps from the floor above, consider adding fiberglass batts to the joist spaces. You can add a 3-1/2-in. layer, or better yet, fill the joist spaces with fiberglass. For even more noise reduction, isolate the ceiling drywall from the joists with resilient channels. Screw the channels to the joists, spacing them 12 or 16 in. apart (ask your building inspector what's required). Then screw the drywall to the channels, being careful not to drive screws into the joists. This creates a “floating ceiling” that reduces sound transmission. You may have to visit a drywall supplier to find resilient channels.
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Seal Around Pipes and Wires
Seal small cracks around pipes and wires with special “red” high-temperature silicone caulk. Fill larger openings with flame-resistant expanding foam. Close openings around chimney flues or other large openings by nailing sheet metal over them and sealing the edges with caulk. Sealing between the basement and upstairs will help prevent the spread of fire from the basement to upstairs. It will also save energy and prevent sound transfer from the basement to the upstairs.
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Buy a Laser for Speedier Framing
If you've been looking for an excuse to buy a laser level, this is it. Especially if you plan to stick-frame the walls—that is, build them in place rather than build them on the floor and stand them up. That's because with stick-framing you have to transfer the location of the bottom wall plate to the ceiling. You can do this with a straightedge and a regular level. But a laser is so much faster! Start by marking the wall locations on the floor with a chalk line. Then simply line up the laser with the chalk line, and the laser beam will show the location of the top plate on the joists. You'll need a laser that projects a vertical line. And we like the self-leveling type for better accuracy and faster setup. Self-leveling lasers cost from $30 to about $400.