Good and Bad Woods for Pressure-Treating
Here's a list of wood species that accept preservative treatments readily, and wood species that don't. July 11, 2013
I have some white pine 6x6 posts that I would like to get pressure treated. Yesterday I heard from a forester that white pine does not lend itself well to pressure treating. Is that correct? If so, why?
(Sawing and Drying Forum)
From Professor Gene Wengert, forum technical advisor:
Except for the red heartwood and knots (red or black), I also would be interested to hear why it cannot be treated well. In fact, I believe that it might absorb quite a bit of chemical, which is expensive, but provides outstanding protection. Note that for large timbers, only the outside is treated heavily; the core is often not treated much at all.
Here is a list of easy-to-treat species:
Douglas fir (coast)
eastern white pine
Hard to treat:
pine noble fir
Douglas fir (Rocky Mountain)
western red cedar
From contributor B:
Eastern white pine does treat quite readily. There are a couple published papers in the literature which document this, and a treater in Maine who used to, and may still, do a fair volume commercially. Be sure the MC is below 25%.
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