Treated Joists

Bill

i had a GC that insisted on making all the floor joists ACQ. Fine, we made all the beams and joists from it. I myself had crowned every joist. 2 months later the GC said i screwed up. I went back and there was gaps like 1/2" in 8' across the floor! Then she started to have problems with the joints at the ceiling and walls cracking, caulk at the cabinets started to crack, and her hardwood floor started to buckle. I think its because the treated joists swell and contract and twist all weird ways (Look at a deck). Do you think these problems may be related to the treated joists?

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neolitic

Yes, shrinkage is considerable when it finally
dries out.
Up side is, it's stable now.

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Bill

yes it is stable now, but you should see her kitchen!

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genecarp

yes, acq as far as i am concerned should not be used interior. do some research, confirm that it was improperly used, push blame to the contractor. that was a stupid call on his or her part.

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BuriedHammer

I built a house with a guy once who insisted we use treated for the triple 2x10 main beam down the center, supposedly since the house was on a crawlspace and therefore the beam would be exposed to high humidity...(?)

Sometime during mechanicals I was down there jacking the beam and slipping about 1/4" of shims under that beam due to shrinkage of the treated wood drying out....

So I would agree with neo yeah you have some shrinkage there from the treated, which sounds a little more severe than my beam droop... sorry

deckman22

Unless it's KD after treatment TP should not be used inside. I've seen TP deck boards shrink a good 1/2" or more once dried out, no reason joist in a house wouldn't do the same thing once dried out too.

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Patrick

Is there a such thing as KD pt?

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Originally Posted by Celtic
Like I said...I'm sure you are very good at what you do ~ whatever that is and where ever it happens.

WarnerConstInc.

PT for framing in a house, that is a really, really, really silly idea.

They used to use wet lumber back in the day 1900 and earlier.
But they would put up the shell of the house and then let
it sit for a year before thay did anything else.

Those things are tight now.

tool junkie

project phase 2:
Bondo or Demo... choose your weapon

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neolitic

Look for KDAT, Kiln Dried After Treatment,
it's out there, but comes dearly.

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BirmanBuilders

wondering does she have big green lines running through her kitchen ceiling now?

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