AIA Small Project Design (SPD) Knowledge Community supports, celebrates, and promotes small projects by engaging designers and the public.
We've had good luck wrapping the pipe in a membrane, then filling the stud bay with spray foam. The wrap is just an isolation idea in case the pipe one day needs to be serviced or the insulation removed... Where noise is an issue we do this whether we use plastic or cast-iron.
Marc Bailey, AIA
Pelone Bailey Architects
38 Main Street | Chatham, New York
Michael said he had EXISTING PVC, as in, stuck with it.Judith
Most light weight insulation materials will do a poor job in dampening water noise because such sounds include low frequency, long wave length sound which are not intercepted by light weight fibrous or cellular materials. The remedy you probably have already heard is take out the PVC and install no-hub cast iron in the vertical sections. (Less noise will be coming from ceiling piping because flow in horizontal runs is generally laminar and not turbulent as it is in vertical sections.) You need the mass of the cast iron to intercept the low frequency noise. You could try mass-loaded vinyl pipe wrap, but that will be less successful than cast iron because the mass of the wrap will be significantly less than the mass of the cast iron. The amount of noise dampening will be proportional to the mass of the pipe or pipe wrap.
A r c h i t e c t, P. E.
1100 Rock Rimmon Road
Stamford, CT 06903
203 329 0066
Insulation: 1 lb psf reinforced-foil faced loaded vinyl barrier bonded to a 1" thick scrim faced quilted fiberglass absorber:
Sound Seal B-10 LAG/QFA-3, or equal by Kinetics Noise Control or others:
Resilient pipe supports to prevent pipe from rigidly contacting drywall or framing and transmitting vibration and noise to structure:
You might consider "Acoustidrain": https://www.resisto.ca/en/product/acoustidrain-1971/
I used in once a few yrs ago in my own house, to wrap PVC toilet sewer drain inside wall down through the first floor. It arrives as a kit, ready to wrap and seal. Followed the instructions carefully, and I found it was quite effective.
Eugene Aleci RA, AIA, AICP
President, Community Heritage Partners
355 West Orange Street
Lancaster, PA 17603-3736
[View this post online to see image]
NOTICE: This message is private communication. It, and any files, text, or drawings attached, contain confidential and privileged information for the sole use of the intended recipient(s). If you are not the intended recipient, you may not read, copy, use, or disclose any content to others. If you received this message in error, please notify the sender by reply email immediately and destroy all copies of this message and any attachments. Thank you.