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Getting ready to finish the main bathroom. The shower will be in a corner with one wall being exterior. 2 by 4 studs.
I want to beef up the insulation on the outside wall. Options as I see them:
Add to the studs and use 6 inch fiberglass
Fill the 2x 4 wall with sheet styrofoam
Leave the 3 1/2 inch fiberglass in place and put sheet foam over the studs, then drywall. 1 inch foil faced foam or 2 inch styrofoam?
I really don't see an easy way to do the wall with spray foam.
Your thoughts?
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(05-29-2021, 12:41 PM)goaliedad Wrote: Getting ready to finish the main bathroom. The shower will be in a corner with one wall being exterior. 2 by 4 studs.
I want to beef up the insulation on the outside wall. Options as I see them:
Add to the studs and use 6 inch fiberglass
Fill the 2x 4 wall with sheet styrofoam
Leave the 3 1/2 inch fiberglass in place and put sheet foam over the studs, then drywall. 1 inch foil faced foam or 2 inch styrofoam?
I really don't see an easy way to do the wall with spray foam.
Your thoughts?
I'm not sure the 'benefit' will be worth the bother.
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(05-29-2021, 02:27 PM)KC Wrote: I'm not sure the 'benefit' will be worth the bother.
+1
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Your most cost effective option is to use R-15 fiberglass in the standard 3-1/2" studs. Foam board will be only marginally higher at 17.5. For greater insulation you would either need to go with spray foam or increase the stud depth.
John
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05-30-2021, 01:46 AM
(This post was last modified: 05-30-2021, 01:47 AM by Tapper.)
I'm with John on this one as to your options; my choice would be the spray foam insulation (BTDT). More R value and air tight. However, in today's environment it may be difficult to get someone out to do a small job.
Doug
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(05-30-2021, 01:46 AM)Tapper Wrote: I'm with John on this one as to your options; my choice would be the spray foam insulation (BTDT). More R value and air tight. However, in today's environment it may be difficult to get someone out to do a small job.
Doug
Actually, you can buy DIY spray foam kits now, but they aren't cheap.
John
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(05-29-2021, 12:41 PM)goaliedad Wrote: Add to the studs and use 6 inch fiberglass
if your thinking here is sister 2 by 6 studs, something easier and more economical is to rip some 2 by stock down to 2". cut into 6" blocks. mount 2' o.c. up the existing studs
if you want to get really creative, look into mooney wall construction.
