Treated wood

[minez]

I wonder if I need to use treated wood trusses for this application.

The trusses are for a small roof structure, which will be covered on top so they will not be exposed to rain directly but underneath is completely open without any walls. We've got a long and rainy winter here. Shouldn't I use pressure treated wood for the truss?

Thanks,

Minez

 

[LHiggins]

Typically no, treated wood wouldn't be required. I don't think I've ever even seen a wood truss that was treated, at least not in the state of Washington. Since it's an open structure, I would use treated posts.

Larry

 

[dik]

As long as the truss is not exposed directly to water and any moisture it is exposed to can readily evaporate so the wood moisture content is generally less than 18%, rot is not a problem.

Of some concern, with freezing and thawing in a humid condition, it is possible for the truss plates to work their way out... you might want to have the owner keep his eye out for this...

Dik