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Determine the area where the sound is coming from. Next, use a drywall saw to cut a hole in the wall and expose the area. Use a mirror to get a better look at the problem causing pipes and assess the situation.
To prevent friction between pipes in close quarters, install insulation around the pipes, using roofing felt as a buffer under the PVC pipe.
With the felt in place, squirt polyurethane expanding foam into the gap between the pipe and the subfloor. This will isolate the noisy pipe.
Close up the hole with a new piece of drywall, and screw it in place. Apply drywall mud and tape to seal the hole. Allow this first coat to dry. Sand down the area and apply a second coat of drywall mud. Once the second layer is dry, sand down and paint to finish.
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