I've added an 8 x 32 farmer's porch to my home. Unfortunately, birds, hornets, and other critters are enjoying the shade in the exposed rafters. So...I'm now putting up a ceiling that should put an end to the local fauna squatting up there.

I've already purchased and pre-stained a bundle of 1 x 8 x 8 pine shiplap for the ceiling. I even got the screws - a BUCKET of 9 x 2.5 Hillman PowerPro ceramic coat. The ceiling will hang from 2 x 6 ceiling joists on 16 centers. I doubled up the joists every 8 feet so two board ends won't need to share a joist. So It's ready to go...except...

I don't know how many fasteners I should use for each board !

Plan A would be two screws per joist (one inch from each side). This would give me 14 fasteners per board - more than enough to hold it up there. My concern is about cupping. Will two fasteners on every hoist be enough to mitigate this?

Plan B would be three screws per joist (3/4-inch from the sides, one in the middle). That would be 21 fasteners per board - overkill ???

Plan C would be two screws every-other joist (one inch from the sides). The remaining joists would get a single screw in the middle. So the pattern for each board would be 2 - 1 - 2 - 1 - 2 - 1 - 2. Would this give me the best of plans A and B with only 11 fasteners per board ?

Whatdoyouthinkishoulddo ???