On Sun, 20 Jul 2003 18:42:32 +0100, "Adi"
wrote:

Have built a shed with a strong frame and used shiplap cladding. The
Cladding is securely nailed to the frame

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).