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Old 10-22-2013, 09:17 PM   #16
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Thanks a lot..

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Old 10-23-2013, 06:25 PM   #17
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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
I was referencing Low Density FG when I made the statement:

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.

I agree that I don't recommend putting 2 layers into 1 but slight compression of fiberglass has shown it to perform better when you factor in the convection reductions.

I would rather have a 6.25" batt in a 2x6 wall than a 5.5" batt.

Again, it all depends on LD vs. HD batts. Plenty of articles and data demonstrating the down-rating of insulation values based on convection.
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Old 10-23-2013, 11:05 PM   #18
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Insulation/Soundproofing


To other readers thinking of using R-11 (3-1/2") fg, it hasn't been allowed in residential energy code since 2003, so buy the medium density (lowest R available at the two box stores) for your walls in a single layer application to meet minimum code; http://publicecodes.cyberregs.com/ic...?bu2=undefined

http://publicecodes.cyberregs.com/ic..._11_sec002.htm

You can still get low density R-19 for your walls at the boxes, though; The "biggest loser" in fiberglass insulation....

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Old 10-24-2013, 06:24 PM   #19
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Thanks guys. I'm a little confused. So would it be better for us to put a thicker ...say 6 1/4 R19 and quiet rock instead of the Roxul and 3 1/2 R13 on top of each other? Thanks.
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Old 10-24-2013, 08:56 PM   #20
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Thanks guys. I'm a little confused. So would it be better for us to put a thicker ...say 6 1/4 R19 and quiet rock instead of the Roxul and 3 1/2 R13 on top of each other? Thanks.
The high end solution (best thermal and sound insulation, but highest cost)

Roxul R22 ComfortBatt thermal insulation in stud bay
QuietRock drywall (or similar) installed over resilient channel

The low end solution:

R19 low density fiberglass batts from HD/Lowes in stud bay
Regular drywall fastened directly to studs

I would forget about layering insulations if I were you. I recommend you go with one of the above or some permutation of them.
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Old 10-25-2013, 03:56 AM   #21
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The high end solution (best thermal and sound insulation, but highest cost)

Roxul R22 ComfortBatt thermal insulation in stud bay
QuietRock drywall (or similar) installed over resilient channel

The low end solution:

R19 low density fiberglass batts from HD/Lowes in stud bay
Regular drywall fastened directly to studs

I would forget about layering insulations if I were you. I recommend you go with one of the above or some permutation of them.
How about th r19 with quiet rock?
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Old 10-25-2013, 06:50 AM   #22
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How about th r19 with quiet rock?
Sure. That's what I meant by "or some permutation".

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