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Sagging Between Joists because of Load Bearing Wall

Sagging Between Joists because of Load Bearing Wall


Old 11-08-13, 11:39 AM
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Sagging Between Joists because of Load Bearing Wall

In an old farmhouse there is some sagging in between 2 floors joists. The original joists were more or less logs, at some point long ago the logs were replaced with rough sawn joists. When this was done the new joists were spaced in between the logs. This left a load bearing wall running parallel with the joists supported only by the subfloor between 2 joists. Over the past hundred or so years there is some sag, most noticeably there is a 12"-16" section were the subfloor is cracking and sagging up to about 3/4".

What would the best way to correct the sag and support the wall above? Would it be best to run a new joist directly under the wall to support it?

The floor/structure is strong otherwise, minimal sagging and stiff except in that one area. The joists are roughly 8" by 2.25", the subfloor is 1" planking.
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Old 11-08-13, 03:26 PM
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What's the span?
What's the spacing of the joist.
2 X 8 is only good for about 10'.
Unless you can add a wall or some form of beam to hold it up there's not much you can do.
Old 11-08-13, 05:26 PM
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If the "logs" are still there, and you can jack them up and put a couple posts under them to prevent things from sagging any more, I would do that. Hard to give specific advice without a floor plan style drawing of some type and some measurements.

If the logs aren't there, I would probably insert a header of some type directly under the wall in question and then support it with columns as needed.

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