[masraum]

Originally Posted by ben parrish

3/64 of an inch is well within spec for pine tongue and groove. How wide are these boards? You’re going to have expansion and contraction with pine in the humidity of Houston. It certainly can move this much. Are you talking shiplap or beaded tongue in groove with the backside being a V groove at the joint?
If this is knotty pine, I’m very familiar with this type of product as the ceiling in our family room has 8” and I have about 1000 ft.² of the 12 inch boards inside my garage. If you decide to paint this type of product, you’re going to have to use a shellac base primer as the knots will bleed through anything water-based.

It's 1x4, so the face of the board that you see is 3". The back is completely flat and the front is beaded. We are putting the back out (like the rest of the house, floors and walls). It's pine but there are no knots in any of the boards.

We do have a special primer specifically for this sort of wood (but like I said, no knots). And then another primer to go over the first primer.