How to Correct a Sagging Floor eHow

How to Correct a Sagging Floor eHow


Working in the basement, determine exactly where the joists are sagging. Do this by slowly moving your level across the bottom of the joists and watching to see how the bubble moves. Typically, you’ll find that the center joists are bending downward in the middle of the area, furthest from the support walls. Mark on the joists to show the lowest points of the sag.

Set your second four-by-six beam on the floor, sitting on its narrow side, directly under the one you’ve just hung and running in the same direction. Stand your floor jack between the two beams, on top of the one that’s on the floor, and turn the thread on the jack until it wedges under the top beam. The jack should be placed directly beneath the center joist. Secure the jack to both beams, top and bottom, putting screws into the holes on the flat steel plates that are pressing against the wood.

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