Shoring Floor Joists

Crawl space floor below to take some weight off the joists until the adhesive cures in a day or two.

Shoring floor joists.

Nail the block in place with 16d. Place the lumber block between the two joists. Adding that extra layer makes a big difference tom says. For this fix to work well the upper edges of the joists must be solidly fastened to the subfloor above.

Thre ways to fix a sagging or sloping floor add reinforcing metal. A layer of 3 4 in. A day until they re level. 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.

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. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. Plywood firmly fastened to the undersides of joists helps prevent this side to side bending and stiffens the floor. 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. Jacking them up too fast may cause cracks in the walls and floors overhead. Cut a piece of 2 by 6 or 2 by 8 lumber according to the width. Depending upon the conditions it is possible to strengthen or repair existing framing members such as floor joists or roof rafters by adding reinforcing material.

Measure the width between the span of two joists.