ADDING NON-STRUCTURAL DEPTH TO RAFTERS FOR INSULATION


ChiefUserDQ
 Share

Recommended Posts

I need to add depth to my 2x8 rafters for insulation depth (12" for R-38). Shown is a purlin added to the ROOF PLANE ceiling finish. Is there any way to create a 2x furr-down that is aligned with the rafter but is non-structural?

We finish attic spaces often so it would be great to find a way to represent this correctly.

 

Thank you for any help you can give.

image.thumb.png.73f1f7644bffd3d5594c31e3318cbc5a.pngimage.thumb.png.3a26a2f8c16964e8a0906fdac03255b1.png

Link to comment
Share on other sites

You might try a ceiling plane slopped the same as the roof but installed lower than the roof.  of course, remove the drywall under the roof. the ceiling plane has its own framing to make any size and direction you need.

Link to comment
Share on other sites

A couple of comments:

  1. Please fill in your "Signature" so we know what version and hardware you're using.
  2. Please post Questions in the Q&A Forum.  Tips and Techniques is for sharing your tried and true methods.
  3. You could do one of two things to solve this:
  • Use 2x12 Rafters
  • Use 2 Framing Layers (2x8's and 2x4's) for the Roof Framing. (the framing would be stacked but only 11" thick so you might want a 1" air gap between)

OTOH, if this is an existing attic and you just want to furr-down then Perry's method would probably best.

 

  • Upvote 1
Link to comment
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
 Share