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Old 01-19-2010, 10:51 AM   #1
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Cinder block wall - filler


I have a shared cinder block wall in my townhouse and am looking to stop sound from traveling up the wall.

My first thoughts are to drill a hole in each block and use an expanding spray foam. Any thoughts if that will work or if there is a better way?

Also, can you rent spray foam kits at home depot? I think I'd need the type that hooks up to 2 propane tank-like vessels. Any ideas on cost ?

Thank you
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Old 01-19-2010, 02:35 PM   #2
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I can't picture it, cinder blocks are usually filled with mortar, does that spray foam even stop sound? That is made for filling in gaps.

Only thing I can think of is to frame another wall with fiberglass insulation and soundboard attached, and a one inch gap from your bricks.
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Old 01-19-2010, 02:58 PM   #3
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"Cinder blocks" are NOT usually filled with mortar, but in some areas they are filled with grout, which is a big help since the mass is increased.

I saw not mention of of brick, but it is a shared townhouse wall.

Fiberglass batts are not very good for sound and other batts that are much better.

Foaming or caulking cracks is a big help if the wall is exposed, since sound does not just go up, but travels in all directions.

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Old 01-19-2010, 03:01 PM   #4
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That wall is possibly already filled with (depending on its age) vermiculite, perlite, or some other newer fireproofing material.
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Last edited by Willie T; 01-19-2010 at 03:08 PM.
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