You shouldn't nail things securely on outdoor structures - wood moves
with moisture changes, and it will either warp, split or pull the
nails out. It _will_ move, you'll never "nail it down".
Shiplap boards (any lapped boards) should be nailed with one nail at
each end (maybe in the middle too), but these nails should all be in a
line along the grain. Don't put lines of nails across the grain.
Expect about 10% movement (enormously rough guess) and so allow at
least 15% overlap (assuming further shrinkage).
Nail into each noggin about 1" up from the bottom of each
board, as AD says, however one nail at each end and one
in the middle is not enough in most cases. You must not
mail through the bottom of one board and the top of another
(or each edge, in featherboarding, for instance).
I don't think you can do that on most shiplap boards, they
can't be overlapped that much. The rebate usn't that deep!
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