Finishing Interior Tongue and Groove. Need to backprime?
Hey folks, I did some searching but struggled to find many answers to my question:
I’ll be installing loads of tongue and groove in my interior, both on the walls as well as on a vented cathedral ceiling. Boards are 6″ pine as well as some cedar.
While I meticulously stained all 6 sides of my exterior siding boards (installed with a rainscreen) I think I like the idea of installing the interior boards dry and then brushing or spraying them all afterwards with a coat or two of water based poly. Does anyone have concerns with this method? Is cupping a real issue if only one side is treated on an interior wall? Is it actually easier as I assume?
My walls are 2×4 with well-taped exterior sheathing and will be insulated with mineral wool. I was planning on putting the boards right up over the studs. Rafters are also 2×4 and I plan to “cut and cobble” 3.5″ polyiso for the rafter bays (leaving a 1″ air gap below the roof deck) tape the seams, and maybe additionally apply an interior membrane or taped 1/4″ ply for air-seal redundancy. Additional opinions regarding the potential stupidity of any of these assemblies is welcome! I’m in climate zone 4, coastal northern California.
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