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Does exposed wood framing covered under porches and canopies need to be treated?

Does exposed wood framing covered under porches and canopies need to be treated?

Does exposed wood framing covered under porches and canopies need to be treated?

(OP)
What do you think? Is there a consensus on this?

RE: Does exposed wood framing covered under porches and canopies need to be treated?

Depends on the climate and expected lifespan.

If it's my porch, it needs to be treated. thumbsup

RE: Does exposed wood framing covered under porches and canopies need to be treated?

I agree with TomDOT on both sentences.

RE: Does exposed wood framing covered under porches and canopies need to be treated?

If it is likely to be wetted frequently, and dry slowly, it should be PT’ed. That would be decking, floor boards, joists, ledgers, posts, etc. which are openly exposed to the weather. I put peel-n-stick tape or felt on the top edge of deck joists before applying the decking. I also top flash multi-ply beams. It is these wood-to-wood contact points which do not dry fairly quickly Covered roof trusses and/or t&g ceiling boards, and the like, which will not likely see anything other than the ambient local humidity should not need to be treated; but they might best have some surface finish, all sides and ends, which limits moisture intake.

RE: Does exposed wood framing covered under porches and canopies need to be treated?

IBC 2304.11.2.7 Posts or columns states the following:

Posts or columns supporting permanent structures and supported by a concrete or masonry slab or footing that is in direct contact with the earth shall be of naturally durable or preservative-treated wood.
Exceptions:
1. Posts or columns that are either exposed to the weather or located in basements or cellars, supported by concrete piers or metal pedestals projected at least 1 inch (25 mm) above the slab or deck and 6 inches (152 mm) above exposed earth, and are separated therefrom by an impervious moisture barrier.

RE: Does exposed wood framing covered under porches and canopies need to be treated?

(OP)

Quote:

If it is likely to be wetted frequently, and dry slowly, it should be PT’ed. That would be decking, floor boards, joists, ledgers, posts, etc. which are openly exposed to the weather. I put peel-n-stick tape or felt on the top edge of deck joists before applying the decking. I also top flash multi-ply beams. It is these wood-to-wood contact points which do not dry fairly quickly Covered roof trusses and/or t&g ceiling boards, and the like, which will not likely see anything other than the ambient local humidity should not need to be treated; but they might best have some surface finish, all sides and ends, which limits moisture intake.

So if covered, yet exposed roof rafters in a open canopy only really get a little wind-driven rain, they don't need to be treated?

RE: Does exposed wood framing covered under porches and canopies need to be treated?

Some of that depends on the design - for example, while most of the rafter could be well covered, but rafter ends at (or close to) the dripline then lead to rot from exposed end inward.

RE: Does exposed wood framing covered under porches and canopies need to be treated?

We limit untreated lumber to be contained within conditioned spaces only.

In Russia building design you!

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