Shoring Floor Joists

Thre ways to fix a sagging or sloping floor add reinforcing metal.

Shoring floor joists.

Finally many pros have praised luxor s ibs2000 an interlocking bridge system sized especially to fit between the flanges of i joists for quick added stiffness. Nail the block in place with 16d. Crawl space floor below to take some weight off the joists until the adhesive cures in a day or two. For this fix to work well the upper edges of the joists must be solidly fastened to the subfloor above.

Cut a piece of 2 by 6 or 2 by 8 lumber according to the width. Plywood firmly fastened to the undersides of joists helps prevent this side to side bending and stiffens the floor. Jacking them up too fast may cause cracks in the walls and floors overhead. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

Instead it may be an issue with joists and beams below your floor that require shoring up. Tack a beam under the sagging joists. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Adding that extra layer makes a big difference tom says.

In some cases pouring floor leveling compound will fix the problem. All gateway industries joists beams stringers are compatible with all major aluminum shoring systems including aluma systems aluma beam aluma stringer aluma strongback and jasco s hi lite beam hi lite stringer and patent construction harsco patent joist patent stringer and symons joist symons beam and safway joist safway stringer and waco scaffolding beam waco stringer etc. Place the lumber block between the two joists. Measure the width between the span of two joists.

Squeaks in a floor usually mean that the subfloor has loosened from the joists.