Vent channel from 4×8 insulation panels
MLEH
| Posted in Energy, Heating & Insulation on
I’m looking for an article that was supposedly in a FH about cutting and folding 4’x8′ Ultra-R insulation panels to make vent channel and blocking in one shot.
Replies
For a 16" O.C. rafter...
1. Take your 1" ridgid foam board, cut it into 16.5" wide strips.
2. Along each long edge, cut a line 1" in from the edge, but not all the way through.
3. Fold each edge over, now you have a 14.5" wide chute, spaced exactly 1" from the roof deck.
4. Wedge the chute up into the rafters, cursing the framers who built your rathole their inconsistent rafter spacing and their choice in wavey wood. Foam in any gaps along the edges to keep it up.
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
I don't feel it's healthy to keep your faults bottled up inside me.
I used old political signs and pieces of 1x2:
Take two 1x2 as long as you can manipulate in the attic (about 7 feet), place them on edge spaced 1/2" under the spacing between truss "rafters", staple the sign to them (cut about 2" wider than the spacing). Leave 1x2 "tails" on one end of about 4", creating an H shape with very short legs on one end. Then staple a piece of 1x2 flat between the two other 1x2s at the tail end. A small piece of sign board stapled across the tails completes the job. (Note: A jig helps greatly with assembly.)
Haul this beast into the attic and work it, 1x2s up, into the slot, so that the tails rest on the top plate. Raise the other ends of the 1x2s up parallel to the rafters and tack in place with some piffin screws.
Works well even in a 4/12 attic where you can't get within 4 feet of the eaves.