Insulation question - SHould I or Shouldn't I - AVS Forum
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post #1 of 11 Old 09-03-2013, 07:38 PM - Thread Starter
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Hi all,

Need to pick some brains here.

Getting close to the build and finishing up the final preparations.

When it comes to insulation in the ceiling rafters and the interior walls surrounding the theater is insulation needed if sound proofing is not an issue?

My wife and I live alone, no kiddies around the house, and the master bedroom is on the other side of the house, so I have no want nor need to soundproof the theater.

But is that the only reason you would insulate the ceiling and interior walls? Or is there an improvement to room acoustics because of it?

Thanks

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post #2 of 11 Old 09-03-2013, 07:43 PM
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Any enclosed air cavity can have a tendency to resonate, like a drum. Filling them loosely with fiberglass is the simplest and possibly most effective way to combat the drum's contribution to the movie soundtrack. smile.gif
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post #3 of 11 Old 09-03-2013, 08:53 PM
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Not required, but it will never hurt. Keeps other sound out as well.
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post #4 of 11 Old 09-03-2013, 10:00 PM
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Yes, it will help keep sounds out of the theater room as much as keep some sound in - and it's sooooo cheap to throw the pink fluffy stuff in the walls / ceiling around the one room where you absolutely want the best audio performance, it's a no-brainer...

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post #5 of 11 Old 09-04-2013, 05:33 AM - Thread Starter
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Alright, you guys sold me on it.

I wont need that much anyway for the ceiling and 2 walls (the exterior walls come with insulation already)

Thanks guys

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post #6 of 11 Old 09-04-2013, 05:50 AM
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I also agree, do it.
Pink insulation was basically the only "soundproofing" I did in my last house, and it actually made a world of a difference. Things like furnace noise, footsteps on the floor above, dishwasher noise from above, my wife talking on the phone above were all greatly reduced. Simply filling all air cavities with pink insulation actually does a pretty good job at killing mid- and high- frequency sounds (at reasonable volumes), especially when you consider how little of an extra cost it is (extra 0.5% of basement cost??). I would also recommend doing the same around any bathrooms or bedrooms you are building.
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post #7 of 11 Old 09-04-2013, 06:11 AM
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Also,

Potentially important, when I built my theater, my master is above it and with a toilet, sink, shower, etc, that's potentially a lot of water rushing if someone's up while watching a movie. PVC is loud! You have to do more to quiet it than insulation in the rafters.

We put all cast iron pipes above the theater so all is whisper quiet.

Nothing worse than a quiet climax and a toilet flush to kill the moment!biggrin.gif

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post #8 of 11 Old 09-04-2013, 01:34 PM - Thread Starter
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Quote:
Originally Posted by thebland View Post

Also,

Potentially important, when I built my theater, my master is above it and with a toilet, sink, shower, etc, that's potentially a lot of water rushing if someone's up while watching a movie. PVC is loud! You have to do more to quiet it than insulation in the rafters.

We put all cast iron pipes above the theater so all is whisper quiet.

Nothing worse than a quiet climax and a toilet flush to kill the moment!biggrin.gif

I will never let you go Jack. BAAAAA_WOOOOOOOSH.

M-M-M-MooooooD Killer!

Luckily all I have over the theater is the great room, no plumbing whatsoever. Phew!

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post #9 of 11 Old 09-05-2013, 10:11 AM
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Should you fill up the entire soffit with insulation? My soffit is 16" deep by 12" wide. Can I just run insulation across the bottom of the soffit? It would need to be pretty thick to fill up the whole cavity.
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post #10 of 11 Old 09-06-2013, 02:14 PM
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At 26ish cents/ sq ft for R12 fiberglass, I'll be filling my soffit.
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post #11 of 11 Old 09-08-2013, 01:18 PM - Thread Starter
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Got a steal on some R12 this weekend. Someone on Kijiji had 5x 98sqft rolls for $100 total.

Should have enough for all the walls and ceiling now, just need to grab a little more for the riser I think and I will be set.

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