Lay a solid wood block below the jack to avoid damaging the floor.
How to jack up a sagging floor joist.
If needed extend the jack s range by standing a straight plank on top of it.
Jack up the ceiling with the bottle jack.
Tack a beam under the sagging joists.
Then set new joists same height as existing ones alongside the old.
Whats people lookup in this blog.
Thre ways to fix a sagging or sloping floor.
Jack up the ceiling slowly about a quarter of an inch per day.
A day until they re level.
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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.