Your foundation may not be the problem.
Shoring up floor joists.
In some cases pouring floor leveling compound will fix the problem.
It was nerve racking tom recalls.
Stretch a string across the floor to evaluate the amount of deflection then use it as a benchmark for improvement when jacking.
To check joists and diagnose the problem a pro must pull up the flooring and the subfloor to see what shape they re in.
Tack a beam under the sagging joists.
Photo by richard howard.
Deteriorating floor joists posts or beams can be caused by termite infestation water damage or dry rot.
Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.
This type of repair may require a building permit and usually requires extensive.
Whenever anyone walked across the kitchen floor in the home where this old house general contractor tom silva grew up teacups trembled in their saucers and pots and pans rattled on the stove.
Instead it may be an issue with joists and beams below your floor that require shoring up.
If you build a wall to support joists be sure to place a stud directly and tightly under each joist.
Eventually his father a carpenter went down to the basement with tom in tow and reinforced the undersized floor joists.
By jacking up the ceiling of the basement you.
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.
Place support of the floor joists with wood studs.
Floor joists and posts support the flooring and damage to them is the most common cause of a sagging floor.
The floor above will be stiffest if you place the wall in the middle of the joists.
A day until they re level.
The sagging floor was the symptom and somewhere under the house there had to be a cause.
Where these repairs are not sufficient also consider shoring up joists or beams that were cut drilled or notched for pipes wires or ducts.
For instance you may have a dining room floor that end to end is level but between those two points are various sags and dips.
By building a wall under joists you divide the span.
Shows raisinge a sagging floor gradually with bottle jacks.
Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.
