Leveling floor joists usually means the repair could be as simple as sistering the joists. As mentioned above, the cost to sister floor joists runs approximately $100 to $300 per joist.

"Sistering" each joist with another joist laid alongside it, nailed and glued to the original joist, is the remedial method you described in your question. This is a good way to stiffen a floor ...

If the floor is sagging, old joists can be temporarily propped up with studs or jacks — even bowed into a rise instead of a depression — before sister joists are attached.

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Is there a solution? The floor is several inches above ground level with little support underneath, other than the original beams and joists.

Sistering every joist to create one level takes precision. All-new subflooring and flooring is a lot of material to purchase. Finally the fallout of adjusting the trim and stairs takes time and skill.

Sistering floor joists means securing a new joist alongside a damaged floor joist. “This would involve taking up the flooring and working from above.

Q: Our 35-year-old house has a 7-foot cantilevered deck on the top floor -- about 25 feet above ground level. The untreated fir joists feel solid but have large black areas on the sides ...

Answer: Treated lumber is a good choice. Chances are, the original deck joists were ordinary fir or hemlock. As your question illustrates, the redwood decking on top holds up OK, but the constant ...