DIYbanter - View Single Post - plug up the opening of a 2" cable conduit for soundproofing

wrote:
I have built 2 rooms with a soundproof window between them. I have
buried a 2" diameter PVC conduit under the concrete slab between these
2 rooms, and the opening on either side of the conduit comes up to
grade level in both rooms. I am passing sound system cables from one
room to the other through the conduit.

Now that I have passed the cables through, I like to stuff/plug up the
openings of the conduit with some form of putty material. This material
should remain soft so that I can take it out again when I need to add
or remove the cables.

Any suggestions on what material I can use to plug up the conduit
openings? How about plumbers' putty?

Thanks

Well - is there a possibility you will have more cables to pull
in the not so distant future? In any event it is a good idea to
leave a rope or dedicated wire in your cable conduit for an easy
install the next time you have to do a cable pull - and this has turned
out to be a regular thing in some places I have worked, especially in
the conduit between a machine room and the control room. Also you can
just cover the conduit hole with a large heavy duty Sandbag or two,
such as are commonly used in Stage and Video production applications.
This is I think less messy and more efficient in reducing sound
transmissions than putty or "Stuff" foam, assuming you can cover the
hole and cables fully. You can also build a box to cover the sandbags
if you find them unsightly or in the way.

Cheers,

Will Miho
NY TV/Audio Post/Music/Live Sound Guy
"The large print giveth and the small print taketh away..." Tom Waits