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biddlecom 09-20-2013 06:32 PM

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?

ddawg16 09-20-2013 06:37 PM

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 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.

Gary in WA 09-20-2013 08:21 PM

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;

PS. you will gain in density though;

123pugsy 09-20-2013 08:33 PM

Rip some strips of 1/2'' plywood to put behind the 2x2's.

Fix'n it 09-21-2013 06:32 AM


Originally Posted by ddawg16 (Post 1244295)
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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