Slightly OT: engineered lumber for outside (deck framing) use?

[Heath Roberts]

This is a little off-topis for rec.ww, but I thought some folks here would be in the know, and would likely have opinions... :-)

I'm planning to build a deck this winter that will require some fairly long framing members, and of course, flat, strong, and cheap are always good characteristics. There are a lot of benefits to engineered lumber for typical frame construction--have any of those translated to exposed outdoor uses?

Thanks, Heath

[Upscale]

I think it depends on your finances. Engineered stuff is expensive as hell. I'd use pressure treated lumber for framing and engineered lumber for deck surfaces that are in view.

[Nova]

If you're talking about I-joists and/or glue-lam, I haven't seen any rated for exterior use. The Georgia Pacific brand says they are treated with a sealant for only short term moisture protection. I wouldn't try using any of them outdoors without first checking with the manufacturer.

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