rim joist insulation
is the builder of my house required by code to insulate my rim joists
You did not add where you live in your profile.
It's always best to give your local code office a call with a question like this.
It's not required in my area.
If in the U.S. you probably are required to air seal AND insulate the rims. The "I" Codes require it; eg. #11; http://publicecodes.cyberregs.com/ic...002_par021.htm
5th down; http://publicecodes.cyberregs.com/ic...002_par022.htm
Even Joe's State requires it; IECC 2009; http://www.reedconstructiondata.com/...odes/virginia/
#11 again: http://publicecodes.cyberregs.com/ic...9_4_par025.htm
5th down again: http://publicecodes.cyberregs.com/ic...9_4_par026.htm
Either caulking or canned foam to air seal, wall (usually) thickness insulation on rim. Always check with local AHJ.
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