Roger, possibly you can enlighten me on Kiln Dried lumber. I too live in the
desert where the average humity level is below 10%. I was under the
impression that Kiln Drying is a controled method of reducing the moisture
content below 19% to match the territory it is used in so as to reduce
shrinkage after construction. I thought that Kiln Dried lumber in the desert
delivered wood to the site that was closer to 10% relative moisture content
rather than the traditional 19% and thuse reduced the occurance of shrinkage,
twists, warps and checks.
What are the facts behind Kiln Dried lumber?
Dennis S. Wish PE
In a message dated 6/2/99 4:09:04 PM Pacific Daylight Time,
<< Other than Southern Pine, there is no definition for "kiln dried."
Here in the desert southwest, lumber graded "dry" (19 percent moisture
content or less) will shrink, split, twist and do other strange things as it
dries down to its equilibrium moisture content of about 6 percent. 8 inch
diameter posts will have 3/4 inch splits.
I try to make it very clear to my clients when they want 6 X 12 or larger
beams what will happen to them.
A. Roger Turk, P.E.(Structural)
Tucson, Arizona >>