Strengthen Floor Joists From Above

Tack a beam under the sagging joists.

Strengthen floor joists from above.

The nice thing about a beam and. The joists are quite small 5 5 inch x 2 5inch with tiles above so i would also to take this opportunity to strengthen the floor as i think we re borderline on the deflection front and i dont fancy doing the floor again. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. To keep the walls above from cracking and to prevent other damage the joist sag is lifted a tiny bit at a time usually no more than 1 4 inch every few weeks.

A day until they re level. As incremental parts of a building s structure joists are not easily replaced. Add an additional row of fas teners midway between the joists to pull the layers tightly together. Jacking them up too fast may cause cracks in the walls and floors overhead.

Lay the new sheets perpendicular to the floor joists and orient panel ends over joists. You can however strengthen the joists by securing another length of wood to the existing joist called sistering. Strengthening attic joists for live loads by sistering if the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists.