2x12 as a ceiling rim joist to replicate raised heel truss?
I'm adding onto my house, extending the living room off the front of my house. The existing structure has 2x4 attic/ceiling joists, I'm planning on extending 2x6 joists 2 feet back into the existing ceiling and sistering them to the existing joists. I'll leave a supporting beam under that joint when I take out the existing front wall, I believe I should be ok there. The big question I'm facing is how to do the rafters as I want to do a raised heel rafter. Some of the advice on here has been to stack 2x4's to get the lift, however, I was thinking about using a 2x12 as a rim joist which would then get me R38 out at the wall and then I would have R50 everywhere else in the attic. Does this seem feasible?
Thanks for any advice! It's a tough project for me, while I do home energy audits, I'm not a professional builder and learning as I do the work! Since it's an existing structure that I'm living in as I do it, I'm struggling with understanding how to do the roof. Eventually I'm going to extend the back as well, so I'm basically building a new roof over the existing roof. Going to instal a structural ridge beam, but initially it will only have the front roof/rafters, then a year or so later, I'll extend the back. So I'm taking it a step at a time, knowing I'll need some temporary bracing of some sort on the ridge beam. But eventually I'll complete the back and plan on removing the original roof from underneath the new one...
Posted Jun 23, 2014 11:00 AM ET
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