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RE: Wood shrinkage

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Call the lumber yard and ask if your market is dry or green.  If dry start
with about 19 % or a little less.  If green you may want to start with a
little more although we would specify that the building should not be warped
until it has dried to 19% or less.  Keep in mind that the framing will dry
as it is being erected and before the finishes are on or plumbing in.
Framing in Iowa will dry out to about 6% winter and 9% in summer.  3/8" per
floor is typical.

George Richards, P. E.