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We had a header beam installed in our basement. The floor joists are exposed for 1ft (~30cm) on both sides for the length of the beam.

The basement is an apartment, so I'd like to add some sound-proofing between the floors.

Is there something similar to attic blow-in insulation where they could shove a large hose to the end and slowly retract it to give a bit of a sound cushion?

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Glorfindel
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Jake Berger
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2 Answers2

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See my answer here about methodologies and techniques for soundproofing: https://diy.stackexchange.com/a/11238/3450

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Karl Katzke
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Purchased 3 packs of Roxul stone wool insulation online at Lowes.com. Shipped to the store for free. Ended up returning 1 pack and still have 1/2 leftover.

Put this stuff in all places where there used to be HVAC outlets; as well as about 2-3ft on both sides along the new header beam. Used 1/2" "lite" drywall.

Previously, with one person downstairs talking and another upstairs near the cold-air return, you could almost clearly hear what the downstairs person was saying.

Now, normal talking is barely audible.

Jake Berger
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