If needed extend the jack s range by standing a straight plank on top of it.
How to jack up a sagging floor joist.
Thre ways to fix a sagging or sloping floor.
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Depending upon the conditions it is possible to strengthen or repair existing framing members such as floor joists or roof rafters by adding reinforcing material sandwiching the member on either side with plywood is sometimes worthwhile but the plywood must be installed correctly for greatest strength.
Jack up the ceiling with the bottle jack.
Tack a beam under the sagging joists.
Jack up the ceiling slowly about a quarter of an inch per day.
Lay a solid wood block below the jack to avoid damaging the floor.
Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.
Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.