This is sort of a "water under the bridge" issue but I thought I'd ask anyway.
What is the correct way to install T&G ceiling boards?
I have been posting on an insulation issue in the Insulation forum. I have stained and sealed pine T&G boards for ceilings. Some of the boards show signs of separating at the tongue and groove.
The T&G boards have kraft faced fiberglass insulation on the attic side. I'm concerned that I'm loosing conditioned air through all the areas where the boards are not completely tight.
I have no problem with T&G boards for ceilings, but shouldn't there have been some other material placed on the ceiling rafters first and then the T&G boards. Considering the good possibly the boards would not seal air tight, my thought is plywood or sheetrock should been installed first?
Is there a building code or standard for this? If you were to install the T&G boards, how would you do it to ensure no air transfer?