What is the best way to resolve an issue with misaligned floor joist hangers? Our flooring in the kitchen is starting to dip and sag and it is directly related to the fact that the floor joists are not level with our support beams. I believe that I will be able to jack the joists, bringing them flush with the top of the support beam and replace the joist hangers but I would like some confirmation that this will work. I would rather not rip up the entire floor if I do not need to.
Flooring – Misaligned floor joist hangers
flooringjoistssubfloor
Best Answer
Rather than jacking up the joists it may be easier to sister some 2x6's onto the sides of the floor joists where the mismatches are noticed. These could be wedged into place and then fastened into place on the joist sides. The better way to secure the sistered members will be to apply construction adhesive to the mating faces of the lumber and then securely nail them together. After the adhesive has dried it will be stronger than the nails themselves and will distribute the load into the joist in a uniform manner.
Note that if you are aware of places where subfloor above has joints in wood pieces directly over the joist is would be a good idea to sister the extra member on both sides of the joist.