Extending 2x4 To 2x6 - Insulation - DIY Chatroom Home Improvement Forum

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Old 09-20-2013, 05:32 PM   #1
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Extending 2x4 to 2x6

So i want to add some 2x2 strips to my 2x4 studs to make them 2x6 which would give me space to fit in Roxul R23 which fits into a 5 1/2 inch stud (2x6). The issue im having is that my 2x4 are actually only 3 1/2 inch wide and the only 2x2 i can find are only 1 1/2 inch wide which gives me 5 inch studs. Am i able to compress the insulation 1/2 inch. Or should I do something else all together?


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Old 09-20-2013, 05:37 PM   #2
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News alert....

A 2x4 is actually 1.5 x 3.5....been that way for a long time....2x6 is 1.5 x 5.5....

Maybe a bit more information...like where you live....what the existing wall is like....we are assuming that you have already pulled all of the drywall off...

Lacking any more info....if it was me....I would rip some 2x6's down the middle...or just sister 2x4's to the existing studs so that they stick out the depth you want.


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Old 09-20-2013, 07:21 PM   #3
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Compressing it 1/2" will reduce the total R-value by around R-2, similar to R-15 (high density) fiberglass in 3-1/2 to 2-1/2" wall; http://www.greenbuildingadvisor.com/...fiberglass.JPG

PS. you will gain in density though; http://books.google.com/books?id=e5h...inches&f=false
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Last edited by Gary in WA; 09-20-2013 at 07:24 PM.
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Old 09-20-2013, 07:33 PM   #4
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Rip some strips of 1/2'' plywood to put behind the 2x2's.
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Old 09-21-2013, 05:32 AM   #5
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Originally Posted by ddawg16 View Post
or just sister 2x4's to the existing studs so that they stick out the depth you want.
i did that to square up a wall, and fur it out 1". it was a PITA to get the roxul to fit properly = every piece of roxul had to be custom trimmed/fitted = no fun at all.

decide what you want in the wall. find the thickness of it all. rip strips to the right size. caulk and nail them to the 2x4's.

been there, done both.
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