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Old 02-27-2013, 11:10 AM   #1
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Insulation Size


Hello:

I want to insulate my bathroom while renovating it. I just want to make sure the proper R values to use. I live on Long Island -NY. Want to insulate an exterior wall, interior wall and ceiling for sound proofing.

I have been reading differing opinions. Does r-18 for wall and r-25 for ceiling sound right? Also have read to use R-13 all around...

Which one to use?

Any advice would be helpful!
Thanks!!!

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Old 02-27-2013, 11:58 AM   #2
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Insulation Size


Ayuh,... The Size of the stud bays, 'n joist bays determines how much insulation can be put it...

Ya can't do an R-25 in a 2x4 wall.... Not enough Space...

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Old 02-27-2013, 12:22 PM   #3
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Insulation Size


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Originally Posted by Bondo View Post
Ayuh,... The Size of the stud bays, 'n joist bays determines how much insulation can be put it...

Ya can't do an R-25 in a 2x4 wall.... Not enough Space...

I never mentioned R-25 for the wall. that was for the ceiling...

So what size for the wall - 2x4 16" OC...

thansk!
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Old 02-27-2013, 01:09 PM   #4
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Insulation Size


2x4 - R13

If you used more you're just wasting money...when the insulation is squeezed down to fit the bay, it loses some of it's R value anyway.
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Old 02-27-2013, 01:21 PM   #5
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Insulation Size


A 2x4 framed wall calls for 3.5" insulation in rolls or batts. For fiberglass, that's R13 max and the minimum in your zone. Rock wool (like Roxul) will give you a small boost to R15.

I believe the recommended minimum in your zone for ceilings is R40. However, the difficulty in achieving that depends on your house. If you have 2x10 ceiling joists, you can blow in various kinds of insulation to get it. If not, you'll need to go above the tops of the joists and that means using batts.
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Old 02-27-2013, 02:47 PM   #6
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Originally Posted by operagost View Post
A 2x4 framed wall calls for 3.5" insulation in rolls or batts. For fiberglass, that's R13 max and the minimum in your zone. Rock wool (like Roxul) will give you a small boost to R15.

I believe the recommended minimum in your zone for ceilings is R40. However, the difficulty in achieving that depends on your house. If you have 2x10 ceiling joists, you can blow in various kinds of insulation to get it. If not, you'll need to go above the tops of the joists and that means using batts.

Thanks. I read on owens corning site it said the floor should be r25. I assume that would be for the ciling since it is a first floor bathroom and would be the floor to the second floor. And there is really no need for insulation between floors except for the soundproffing correct?

thansk again!
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Old 02-27-2013, 04:57 PM   #7
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Insulation Size


Right. If you decided to insulate between floors, it would probably just be soundproofing unless you had unusual requirements like a room that was usually unoccupied. The R25 recommendation for the floor means the ground floor. The ceiling means the ceiling of the top floor.
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Old 02-27-2013, 09:19 PM   #8
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Insulation Size


NY has it's own Energy Code (2006 IECC); http://www.reedconstructiondata.com/...odes/new-york/

R-19 for the floors, R-13 (code is minimum like getting a passing "D" on a school test) for the walls as you are in Zone 4; http://publicecodes.cyberregs.com/ic...2_3_par004.htm

http://publicecodes.cyberregs.com/ic...2_4_sec002.htm

There is also an R-15 (high density), that is just compressed R-30 (low density) past the medium density (R-26) for use in your 2x4 wall; http://www.huduser.org/Publications/pdf/walls.pdf

R-13 (medium density 3-1/2") is just R-19 (low density 6-1/4") compressed; http://www.greenbuildingadvisor.com/...fiberglass.JPG

R-15 is available in many widths, from all the insulation manufacturers; eg. https://docs.google.com/viewer?a=v&q...Sl4MDm_aao1YUg

Rock wool would be my choice.

Gary
PS. The "biggest loser" in fiberglass insulation....
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Old 02-28-2013, 09:21 AM   #9
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When I do my bathroom 3 1/2 inches of styrofoam are going in the exterior wall cavity.
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Old 03-01-2013, 06:21 AM   #10
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Insulation Size


These threads are why someone is going make billions when they figure out how to feasibly use aerogel in residential applications.

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