Dave Chapple
05-22-2011, 10:39 PM
When a roof needs sheathing over 1x6 original butted planks, is it possible to put rigid insulation over the panks and osb ply on top of that?
How is an old planked roof resheathed and still pass code?
Because this is a vaulted ceiling, rafters and planks visible from inside the house, triflex black underlayment would be used.
So next question; if rafters are not on 24" centers, say wider (aprox 38", this is an old house) how would you attempt a nailing pattern? And with what nail? The specified 8D Common is too big.
possible solution:
1x4 sleepers nailed to rafters with 8d regular nails over stapled triflex black fabric. cut foam to fit sections. Overlay with 4x8 osb, ofset. preferably stapled with wide crown 1.5" staples, into sleepers. No nailing on butt ends of plywood possible.
How is an old planked roof resheathed and still pass code?
Because this is a vaulted ceiling, rafters and planks visible from inside the house, triflex black underlayment would be used.
So next question; if rafters are not on 24" centers, say wider (aprox 38", this is an old house) how would you attempt a nailing pattern? And with what nail? The specified 8D Common is too big.
possible solution:
1x4 sleepers nailed to rafters with 8d regular nails over stapled triflex black fabric. cut foam to fit sections. Overlay with 4x8 osb, ofset. preferably stapled with wide crown 1.5" staples, into sleepers. No nailing on butt ends of plywood possible.