Straightening a humped joist
I’ve heard of “crown up” when it comes to floor joists, but one of the joists in our hallway took the advice to an extreme. This 8-ft. 2×10 joist bowed upward 1/2-in. above its neighboring joists. The condition was bad enough to cause a hump in the floor, along with an annoying squeak.
My initial impulse was to yank out the bad joist and replace it with a straight one. But then I would have had to deal with the wall-to-wall carpet. Fortunately, my father-in-law came up with a good solution.
As shown in the drawing, I bolted a length of angle iron across the bowed joist and its two closest neighbors. The steel rail, called an elevator rail around here, is T-shaped in section. The vertical leg of the T is 4-1/2 in., while the horizontal cross of the T is 5-1/2 in.
I secured the rail to the bowed joist with a pair of 3/8-in. by 8-in. lag bolts. I predrilled the holes for the bolts, and then I tightened them slowly to keep from shearing the joist. I took out 1/4 in. of bow the first week, then the rest of the hump in the second week. The fix to the bowed joist worked to perfection.
Tony Lindner, Lexington, SC