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Floor Joists Deflecting Upward (opposite of sagging).

Floor Joists Deflecting Upward (opposite of sagging).


Old 08-07-06, 08:54 PM
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Join Date: Aug 2006
Posts: 1
Floor Joists Deflecting Upward (opposite of sagging).

Hello. Thank you for taking the time to read this.

Location: Endicott, NY
Home Built: 1910
Style: Two Story, with basement.

I recently purchased a home with an interesting uneven floor scenario. A couple of the joists on the first floor are actually deflecting upwards (opposite of sagging) by roughly 1/2".

It appears that many years ago a previous owner installed a single lally column with an 8x8 header. The header runs perpendicular to several floor joists. One of the supported joists to the right to the lally column has been sagging over the years because it is below a wall. This sagging has caused the header to tilt or teeter about the lally column. This in turn caused the joists to the left of the column to be forced upwards. There is now a noticeable hump in my kitchen. Floors are hardwood.

How do you recommend I correct the floor system? If I install a new beam (correctly), can the upward deflection be reversed using weight from above?

Here are some pictures from underneath:

Any input would be appreciated.

Jason R.
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Old 08-09-06, 05:58 AM
Join Date: Feb 2006
Location: USA
Posts: 6,389

Have you tried loosening the tension on the jack post?
Old 08-09-06, 05:40 PM
chandler's Avatar
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and moving it to the right where it will be directly under the middle more or less of the beam? This will give balance, but you shoule have the beam tied to the joisting with hangers, or at least nailed to it so it is not loose.
Old 08-09-06, 05:54 PM
Join Date: Dec 1999
Location: South Dakota
Posts: 3,140
Your question is a good one. The correct answer is no one knows for sure. The two joists that are bowed upward will have a set in them and there is no way of knowing if the set will reverse itself. If you do decide to replace the beam, make sure you block the floor joists really well. Good Luck
Old 08-19-06, 02:30 PM
mcm is offline
Join Date: Apr 2003
Location: El Dorado County, CA
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Do you realise a homeless person is squatting in your basement?
Old 08-20-06, 07:41 AM
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Join Date: Jul 2003
Location: Eastern USA
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I think it was a ghost..

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