Shoring Up Floor Joists

Place support of the floor joists with wood studs.

Shoring up floor joists. By building a wall under joists you divide the span. By jacking up the ceiling of the basement you. Then set new joists same height as existing ones alongside the old. Shows raisinge a sagging floor gradually with bottle jacks.

The floor above will be stiffest if you place the wall in the middle of the joists. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in. To check joists and diagnose the problem a pro must pull up the flooring and the subfloor to see what shape they re in. Deteriorating floor joists posts or beams can be caused by termite infestation water damage or dry rot.

For more serious weaknesses you may need to shore up the floor joist structure with a cross beam and lally posts. Well after doing the navy seal crawl up under the house we found that the joists that were supporting that floor were not actually attached to the sill plate any longer as seen in the photograph below. Floor joists and posts support the flooring and damage to them is the most common cause of a sagging floor. Eventually his father a carpenter went down to the basement with tom in tow and reinforced the undersized floor joists.

A day until they re level. Your foundation may not be the problem. Instead it may be an issue with joists and beams below your floor that require shoring up. The longer the distance a joist spans without support the more it will flex.

Stretch a string across the floor to evaluate the amount of deflection then use it as a benchmark for improvement when jacking. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. This type of repair may require a building permit and usually requires extensive. If you build a wall to support joists be sure to place a stud directly and tightly under each joist.

In some cases pouring floor leveling compound will fix the problem. Photo by richard howard. The sagging floor was the symptom and somewhere under the house there had to be a cause. It was nerve racking tom recalls.

Tack a beam under the sagging joists.