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Old 10-21-2006, 06:43 PM   #1
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Using a jack to raise joists


I need to sister some joists in the basement. I have a 20-ton Husky bottle jack that can do the job. Most people say to only raise the joist 1/4 inch and leave it that way for a day before raising it again. Will the bottle jack be able to maintain that for the day or do I need to get another post to hold it in place?

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Old 10-22-2006, 12:38 AM   #2
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Using a jack to raise joists


If the jack doesn't creep (has good seals) it will stay where you put it. But no harm in putting a post under it too. Are you just jacking the centre of the joists trying to take some sag out? Or are you lifting things up above as well?

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Old 10-22-2006, 09:42 AM   #3
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Using a jack to raise joists


That's what I thought but I read an article that gave the impression the bottle jack was good enough. Thanks.

The stupid builders cut about 1/3 of the joist out for a vent. The joist now has a bow in it about 1/3 in from the plate on the foundation. So I guess I have to lift up around the middle.
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