Hello,
I am renovating my attic and will be putting up wood beadboard over rafters filled with open cell spray insulation. The insulation will be treated with a paintable vapor barrier. An architect friend says that back-priming the boards prior to installation is essential. This would obviously mean more work and planning. But since the wood insulation interface already has a vapor barrier, is this step necessary?
Thanks!
Replies
The back priming of the b-board has nothing to do with.........
the vapor barrier up to the insulation surface.................
But everything to do with the beadboard itself. Sealing all sides and cuts will not hurt the board one bit and will in fact keep it more stable-
at least that is my thinking.
You'll want to coat it at least once anyway on the show side so when it expands and contracts you'll not see the unpainted lines.
What's your architect friend say about air sealing and the flamability (potential) of the insulation in regards to first sheeting over the foam with drywall?
The back priming will help prevent the wood from cupping/curling. Do it.