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Old 10-18-2013, 05:20 PM   #1
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Insulation/Soundproofing


We just had out garage framed out as it is going to be a den. As you can see I put insulation panels on the garage door a long time ago. Looking for some advice as to what to use for the best soundproofing as we live on a busy road not too far from the garage. We are obviously going to put insulation between the studs but we need to soundproof as well. Thanks a lot!!
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Old 10-18-2013, 05:57 PM   #2
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Insulation/Soundproofing


Roxul Safe-n-Sound works great for sound proofing. But no R-value, and I'm guessing those panels you have are only giving you about an R 3-6. So, you'll need to choose whether you want to have a cold room or a noisy one, or make a thicker wall to support both types of insulation. I don't know of a product that does double duty.

Around here, you need to special order the Roxul stuff if you're a box store shopper. I've ordered it through Lowe's.

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Old 10-18-2013, 07:26 PM   #3
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Insulation/Soundproofing


Thanks.
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Old 10-19-2013, 09:56 AM   #4
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Insulation/Soundproofing


More rigid foam will help and keeping the interior wall offset and uncoupled from the garage door is going to help as well.

Staggered walls are great for soundproofing.

Be sure to zip up everything tightly so that there are no air leaks as well.

http://www.stcratings.com/assemblies.html
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Old 10-20-2013, 08:14 PM   #5
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Insulation/Soundproofing


try denim insulation
http://www.bondedlogic.com/construct...nim-insulation
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Old 10-21-2013, 05:44 AM   #6
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I actually think it's deep enough from the garage door to the front of the stud where I can fit Roxul and regular R value insulation. Can Iessentially lay one on top of another? Thanks
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Old 10-21-2013, 06:58 AM   #7
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Originally Posted by Mstrlucky74 View Post
I actually think it's deep enough from the garage door to the front of the stud where I can fit Roxul and regular R value insulation. Can Iessentially lay one on top of another? Thanks
Hm. From the pics, it looks like those 2x4s are right up against the garage. If so, there isn't enough space for both. Each type of insulation takes up the 3.5 inch depth of the stud bay. Do not try to compress both insulations into a 3.5 space. That would diminish the effectiveness of each.

If there was space, sure. You could install one in front of the other.
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Old 10-21-2013, 07:18 AM   #8
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Originally Posted by jaydevries View Post
Nice stuff but gratuitously over priced in most applications and does not provide any benefit over Roxul or Fiberglass other than being safer to handle initially.

Quote:
Originally Posted by Mstrlucky74 View Post
I actually think it's deep enough from the garage door to the front of the stud where I can fit Roxul and regular R value insulation. Can Iessentially lay one on top of another? Thanks
Yes you can do that if you want to. Did you look at the links to wall construction recommendations above?

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Hm. From the pics, it looks like those 2x4s are right up against the garage. If so, there isn't enough space for both. Each type of insulation takes up the 3.5 inch depth of the stud bay. Do not try to compress both insulations into a 3.5 space. That would diminish the effectiveness of each.

If there was space, sure. You could install one in front of the other.
Compression of the insulation does not down-rate its effective R-Value that much. In the case of low density fiberglass, there is some rationale to show that it actually improves its real world performance by lessening the convection potential.
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Old 10-21-2013, 07:48 AM   #9
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From the Roxul site: "Do not compress the insulation as this reduces effectiveness."

From Journal of Light Construction: "What happens is that as you compress fiberglass batt insulation, the R-value per inch goes up, but the overall R-value goes down."

References:
http://www.roxul.com/residential/how...exterior+walls
http://www.jlconline.com/building-en...s-batts-2.aspx
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Old 10-21-2013, 06:23 PM   #10
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Insulation/Soundproofing


Well I just measured from the garage to the front of the stud and it's 5 1/4". Think I can put the Roxul on top of the R value insulation? If so, how should I layer it, Roxul first? Thanks a lot
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Old 10-21-2013, 07:25 PM   #11
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Quote:
Originally Posted by Mstrlucky74 View Post
Well I just measured from the garage to the front of the stud and it's 5 1/4". Think I can put the Roxul on top of the R value insulation? If so, how should I layer it, Roxul first? Thanks a lot
You got me. What keeps the insulation in place between studs is friction for Roxul insulation, staples for fiberglass batt insulation. You have 5.25 of clearance, but only 3.5 of stud depth, and you going to to try to squeeze 7" of combined insulation into that space. Both layers rely on the studs to stay in place. You'll have to get creative.

Last edited by cortell; 10-21-2013 at 07:37 PM.
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Old 10-21-2013, 10:34 PM   #12
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I think I would go with regular Roxul ComfortBatts in a R22 which would be right at your depth and then use drywall z channel to decouple your finished wall. Remember you're not making a sound studio, you're just trying to deaden road noise.
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Old 10-22-2013, 08:55 AM   #13
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I think I would go with regular Roxul ComfortBatts in a R22 which would be right at your depth and then use drywall z channel to decouple your finished wall. Remember you're not making a sound studio, you're just trying to deaden road noise.
That's a great idea. Forget the Safe-n-Sound and instead rely on resilient channel and soundproof drywall (e.g., Quietrock). This way you can use the entire 5.25 wall depth for thermal insulation.

Note that Z channel may not be as effective as resilient channel:
http://soundproofing.org/infopages/channel.htm
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Old 10-22-2013, 09:05 PM   #14
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Thanks guys but what is the Channel you speak of?

Edit: Oh I see the link....a little confusing.

Last edited by Mstrlucky74; 10-22-2013 at 09:07 PM.
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Old 10-22-2013, 09:07 PM   #15
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Thanks guys but what is the Channel you speak of?
http://www.clarkdietrich.com/product...hannel-systems

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