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Old 12-19-2011, 03:01 PM   #1
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How to jack up on grade floor?


Hi my kitchen floor is out of level by approx 2inches at one end
and maybe 1 inch at the other and forms a kind of ridge in the middle.
This floor is on grade with approximately 4 inches between the bottom of the
joists and the ground. The joists consists of tree trunks sawed in 1/2 and 2x6s. I have been told
that the only way to flatten out the floor is to jack it up using bottle jacks.
Any suggestions on how to do this, most of the methods on line seem to
be for floors with normal basement heights beneath. Could I use bottle jacks
to move the joists up and then shim the space between the joist and the sill
with something? Hardwood shim or something?

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Old 12-19-2011, 04:10 PM   #2
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How to jack up on grade floor?


hopefully one of the "real" contractors will pipe in here, but I'll give my two cents.

If your kitchen is the only room you need to fix, then I'd just sister in new joists along the old ones, using the new joists to achieve a level floor. Of course, you'd need to remove the floor and subfloor to access the joists, and probably have to gut the room so the wallboard or plaster/lath is not in your way.

Given that you have a hump in the middle of the floor, I doubt jacking is going to level it out, even if you could figure out how to do it.

You may also need to look at how the floor is supported, to eliminate future sagging.

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Old 12-19-2011, 04:57 PM   #3
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How to jack up on grade floor?


My friend had a similar problem and he ran tapered stringers, perpendicular to the floor joists and then applied 5/8 t/g plywood over top of the stringers.
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Old 12-19-2011, 08:24 PM   #4
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How to jack up on grade floor?


M3 Pete has the right idea...you'll need to do a full gut to remedy that problem correctly.
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