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Soundproofing PVC Drain Pipes

forget about fiberglass batts for sound deadening—use 2-part spray foam to keep the sound inside the pipe
July 31, 2023

In this video, Myron Ferguson, That Drywall Guy, explains how to soundproof PVC drain pipes effectively. Soundproofing these pipes minimizes the noise produced by flushing toilets and running water, particularly in homes with multiple floors.

Before delving into the soundproofing process, it's essential to recognize the issue at hand. PVC drain pipes are notorious for producing loud noises when water flows through them, especially at corners and drops. These noises can be disruptive and annoying, particularly in basement apartments.

To effectively soundproof PVC drain pipes, you'll need a two-part closed-cell foam, which is an excellent soundproofing material. A 200-board-foot kit was just about enough for this application.

Prepare all the necessary safety gear and tools, ensuring you have everything within reach before commencing the work. More on spray foam froth kits and PPE here.

Apply Closed-Cell Foam

Begin the soundproofing process by applying the two-part closed-cell foam to the PVC drain pipes. The foam will encapsulate the pipes, creating a barrier to reduce noise transmission. Work carefully to ensure all surfaces of the pipes are covered adequately.

Take your time to apply the foam meticulously. Ensure that every corner, turn, and drop of the pipes is sufficiently coated with the foam. This comprehensive coverage will help achieve the consistent soundproofing results.

Install Drywall

Once you have completed applying the closed-cell foam, it's time to move on to the next step—drywall installation. This additional layer will further enhance the soundproofing of the PVC drain pipes. With the closed-cell foam and drywall in place, Myron assesses the effectiveness of his soundproofing measures by flushing toilets and running water upstairs. Verdict: Pretty darned good.

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