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Part II, or
"Wood expands and contracts based on the relative
humidity the wood is exposed to (Figure 1). It is not
unusual for interior wood moisture content to cycle
between 6% and 12% moisture content seasonally. This
creates interesting wood trim and wood flooring problems
and sometimes makes opening and closing wood doors a
challenge. Stranger still is that when wood shrinks and
expands, it shrinks and expands differently along the
grain than perpendicular to the grain. It shrinks and
expands much more at a right angle to the grain, than
along the grain."
Wood is Good...But Strange By
Joseph W. Lstiburek,
Ph.D., P.Eng., Fellow ASHRAE
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heating, refrigeration, air conditioning engineers.
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