Shoring Floor Joists

Plywood firmly fastened to the undersides of joists helps prevent this side to side bending and stiffens the floor.

Shoring floor joists.

A layer of 3 4 in. Adding that extra layer makes a big difference tom says. 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. 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.

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. Squeaks in a floor usually mean that the subfloor has loosened from the joists. Instead it may be an issue with joists and beams below your floor that require shoring up. In some cases pouring floor leveling compound will fix the problem.

Tack a beam under the sagging joists. Thre ways to fix a sagging or sloping floor add reinforcing metal. Measure the width between the span of two joists. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.

Cut a piece of 2 by 6 or 2 by 8 lumber according to the width. Jacking them up too fast may cause cracks in the walls and floors overhead. A day until they re level. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

For this fix to work well the upper edges of the joists must be solidly fastened to the subfloor above.