I have come to distrust the new ACQ-treated wood, ever since I realized what it can do to metal fasteners. Hot dipped galvanized coated steel can fail, and likely even stainless.
I am thinking through the ways to build a roof-protected and post-supported deck like shown in this picture.
Surely, the three supporting posts that go to piers at grade, should be treated, but how much above that should be?
What if we used something like Alaskan yellow cedar for the beams and joists of the deck, and top-wrapped all members in the Grace stick-on membrane meant for protecting deck structure lumber?
Decking boards will be either P.T., cedar, or mahogany.
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Surely, the three supporting posts that go to piers at grade, should be treated, but how much above that should be?
Why do you have to use treated wood?? Use steel elevated on blocks and cap with Azek or something like that.
You can buy all kinds of galvanized round or square posts that would work just fine for that project, although they certainly don't have to be galvanized.
I agree with you about the treated wood. I don't trust the stuff with any kind of fastener after I've seen how fast it can corrode metal.
I have heard--only heard and seen on TV once--of a product called "blue wood" that is meant for exterior app's, but not for direct contact with water. Can't remember what it's treated with, but I don't think it's the same as the treatment for ACQ.
I am not sure if this would be applicable for your situation, but it seems like it would?
Anyone else have any input on this stuff? Anyone used it? Would it work for this app.?