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Duane Bozarth
 
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wrote:

....
my joist spacing but rather will biscuit the ends of the boards and let
the joints hang in space. I figure the 18 years that the boards hung
either in the solarium or on the side of the house induced any twisting
or cupping forces to express themselves and the planing took it out. I
hope.

....

If it's open-cavity wall, I'd be concerned a little about the ends. If
it's over sheating, that would keep it from buckling. If it's 16" OC
and seems pretty stiff might be ok...

Just a concern w/ lap...I've done similar w/ tongue and groove, but
there's only the one side of the joing w/ lap.