Blow-in insulation?


Old 01-06-20, 08:38 PM
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Blow-in insulation?

I have a duplex rental unit that I rent out, and have a lady who is moving out because of the noise from the tenants on the other side. It has plaster walls.

What I thought was, when I get in that apartment maybe I could blow insulation in the wall cavity between the two units, to dampen the noise. So that the next person who moves in, has more quiet.

How hard is this process? I've seen a Bob Vila video where they drill a 2" hole here and there, top and bottom every 16" and then blow stuff in.
I assume you rent the blower unit. Has anybody done this before, and how hard and expensive was it?
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Old 01-06-20, 11:14 PM
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The equipment used for blown in cellulose and fiberglass insulation is for attics and is not the same used for walls.

That equipment is a truck based compressor and doubtful even available to rent for DIY project.

I would also doubt that it would provide a significant improvement but that would be very dependent on the wall construction between the units.
Old 01-07-20, 12:26 AM
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jeffpas, blown cellulous insulation can be an effective sound barrier but you have several challenges here. You wouldn't want to go through the job only to find out the dampening was insufficient so I suggest finding someone to do it. They should be able to tell you the STC (sound transmission class) rating of the insulation which should be at least 44 assuming the sound issue is as significant as you suggest. Beyond that, rental equipment is usually designed for attics as Marq1 stated.

The bigger problem, though, may be that you'll need permission to do the job. Keep in mind that you don't own the space between the units.
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