Added a 2nd floor bathroom and the waste pipe runs down through the
first floor in a corner of a closet down to the basement. Then the
area where the pipe is was boxed in with hardwood (I know, a sound
When the upstairs facility is flushed it sounds like Niagra Falls goes
right through the closet.
I'm searching for ideas/suggestions as to how to help reduce the sound
level seeing how I cannot relocate the waste pipe. What comes to
mind are things like sound deadening material like what they use in
cars, or 1" thich acoustic foam, et.al. and perhaps reboxing the pipe
with dry wall.
Any ideas greatly appreciated. Thanks
On Saturday 23 February 2013 14:13 BobMCT wrote in alt.home.repair:
Pack the pipe box with glass wool would be one option - fairly densly - you
Also isolate the pipe from immediate contact with the ceiling and floor - ie
make the cutouts just clear of the pipe and stuff some wool in.
I was going to say "use old rags" but these might be prone to holding damp,
attracting bugs and mice. Might be a problem with potential for fire
transmission betwen the floors - building regs/code may have something to
say, whereas it should be very happy with glass wool.
You could also tie wrap some flat rubber sheet around the pipe - eg old car
floormats from the breakers. This *might* damp down the pipe walls before
they get get a chance to emit sound.
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Why not use foam in a can all around the pipe, that requires minimum
holes in the wall, and, isolate the pipe from touching the floor and
ceilings as it goes thru them like an earlier poster suggested.
As per another reply... cast iron a great for sound deadening.
Probably not possible at this point but running plastic pipe at an
angle rather than 100% vertical prevents the flow from separating from
the pipe & "falling".
Assuming you have some working room around the pipe, and assuming the
pipe is 4" diameter and the section in question is 8 feet long...
Take a 6" diameter sono tube (used to form concrete piers) and cut a
slit so it can be placed around the pipe, and use duct tape or something
to close up the tube and seal it.
Run the sono tube up as high as you can in the closet with enough room
at the top to pour in some mortar mix.
This would create a 1" ring of mortar (essentially the same density as
concrete) around the pipe, which would give excellent sound-deadening
The amount of mix you would need is about 0.9 cubic feet - about 125 lbs
(given the assumptions about the diameter and length of the pipe).
On Monday, February 25, 2013 at 6:39:34 AM UTC-8, Home Guy wrote:
If the drain pipe is exposed, I have used spray adhesive to the surrounding
wall cavity to hold small cell bubble wrap with a heavy mil plastic sheet
as a sheath providing maximum fill without directly contacting the wall boa
rd, then filling the void around the ABS with mortar. I would temporarily
dam up the exposed side and fill in 24"increments using OSB or Plywood to c
ontrol and check material as the column was filled. The bubble wrap kept
the mortar separated from the wall board and 24"sections reduced compressio
n weight. Once set, I unscrewed the dam sections and replaced with final
wall material. Took a little longer but very inexpensive. For horizontal
runs I used salvaged heating duct or metal flashing to create a trough unde
r the pipe that was then filled with mortar. The ease and economy of plasti
c with the performance of metal. Seemed like a good idea at the time but on
ly time will tell.
I am also interested in this topic and I have read the suggestions that have
been posted so far and found them helpful.
In my case, I have a basement level apartment that is being completely
rebuilt and all of the wall framing is still open. There are two 3-inch
vertical PVC drain pipes along an exterior wall that is already framed out.
Before closing the walls, I would like to do what I can to reduce the sound
in those PVC pipes without going to extremes or spending a mint. I
definitely do not want to convert the pipes to cast iron, so sound deadening
the existing PVC pipes is all that I am looking to do.
I did this Google search on the topic and found these results which were
On one of the results, from This Old House, it says:
"You can also reduce noise transmission by insulating around the pipe with
sheets of sound- absorbing foams (www.soundprooffoam.com) or with open-cell
spray foam insulation (www.icynene.com). Batts of fiberglass insulation
aren't dense enough to be good at soundproofing."
One problem I found is that most of the sound deadening products are very
expensive -- more than I think it would be worth spending for whatever
limited results they produce.
On one or two sites it talks about using "mass loaded vinyl mat" to wrap the
pipes. That had me wondering if one inexpensive approach may be to wrap the
pipes with left over flexible vinyl flooring -- or just buy some flexible
vinyl flooring to wrap the pipes. The amount needed wouldn't be much
because there are only two vertical 8-foot PVC pipes that would need to be
Or, maybe do a combination of that plus some open cell spray foam in the
wall cavity where the PVC pipes are located. But, I'm not sure about the
spray foaming part and if that would turn out to be more complicated and
more of a mess than it would be worth. I really don't know how far cans of
that spray foam stuff would go, and having someone come in to spray foam
just those two cavities couldn't possibly be cost effective.
Spray foam is not a good idea, and pipe and foam should not touch drywall.
Fiberglass will cut down on reverberation and damp drywall vibration. The
denser mineral product for fire and sound is what I'll be using. Sound
control stick sheeting can be used to wrap pipes. Dynamat or equivalent.
Made for cars and stuff. My coustasheet distributor I can't locate. Heavy
vinyl which I have is hard to find. I also have real heavy xray vinyl. Soft
open cell foam will be better than fiberglass, kind for cushions, in fabric
On Saturday, February 23, 2013 9:13:06 AM UTC-5, BobMCT wrote:
floor in a corner of a closet down to the basement. Then the area where th
e pipe is was boxed in with hardwood (I know, a sound conductor itself). Wh
en the upstairs facility is flushed it sounds like Niagra Falls goes right
through the closet. I'm searching for ideas/suggestions as to how to help r
educe the sound level seeing how I cannot relocate the waste pipe. What com
es to mind are things like sound deadening material like what they use in c
ars, or 1" thich acoustic foam, et.al. and perhaps reboxing the pipe with d
ry wall. Any ideas greatly appreciated. Thanks
Most economical will be frame and finish with drywall and fill with fibergl
ass insulation. As others have pointed out, try to prevent the pipe from c
ontacting the wood anywhere. You might want to consider a solid door for t
he closet and if you can insulate inside the closet walls as well. There a
re other ways but the price is just going to go up so unless you have a com
mercial bathroom upstairs it's probably not worth it.
Interesting, I never tested cellulose. It's not going to be as effective at
lower freqs, as with most types.
Number one, so happens I'm replacing an iron pipe with plastic !!!!!!
Cellulose seems great for in-between drywall, as long as you get it around
the pipe. Larger stagger studding would give more room.
I will be using a lot of roxul product in basement ceilings. Safe n sound,
mineral batting, not designed for thermal insulation. It's also much better
than fiberglass batting for sound. One hour fire rating. Be back with link.
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