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Reply by tmasondarnell

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Posted on Treatment for pressure treated lumber

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tmasondarnell

140 posts in 2669 days


#1 posted 08-17-2017 05:13 PM

Nathan,

I am a little confused by what your question is and what are you concerned about.

The 4×6 PT lumber does not need anything done to it for protection, even with full ground contact.

Adding Thompson water seal will not add any additional protection to the Alkaline Copper Quaternary(ACG) that was driven into the wood fibers under pressure. Most likely the Thompsons will bead up and run off. You will not be hurting anything, but you will be wasting your money.

Painting will offer the best protection against UV damage.


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