Floor Joist Treated Or Not

Deck joists rotting from the top edge down because the deck boards and debris keep them damp for weeks after rain. The joist hangers used in construction with both sawn lumber and manufactured joists are usually galvanized zinc coated. This treated lumber is bolted to the foundation and the floor joists typically rest on it.

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Floor joists in crawl spaces are closer than 18 to the ground.

Floor joist treated or not.

He sees it all the time. Drop girders or beams that set in a cut out of a foundation wall should not have to be treated as long as they have a barrier between them and the concrete. Usually when a joist gets sistered the new lumber does not span the entire length of the old joist. So he has two rot fighting tips for deck owners and builders.

The allowable stresses of pt lumber are lower than non treated lumber which means it can not span as far. Also pt lumber is corrosive so connections need to be such that they resist corr. Photos 1 and 2 show galvanized steel joist hangers supporting nontreated. It is important to jack this end level to keep the floor from sagging any more and to keep the joists from splintering later.

And you thought this was going to be easy. Not all floor joist lumber has the same strength and even wood of the same species but of a different grade will have different strength characteristics. But my friend wasn t. I finished a free standing deck a few weeks back and used ss deck screws ss hangers even ss hanger nails.

On a related note i had to replace some deck joists a while back on a 8 year old deck in ct along the shore. Had started to rot on top of the joists due to the trapped moisture under the decking. Yes pt lumber can be used for framing including floors. The joists were pressure treated lumber so i was surprised at how badly decayed they were.

If there is a doubt then use pressure. So i don t know. Because of this the tail end of the new lumber is not supported. Remember that treated pine is only slightly more expensive than regular pine.

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