Where these repairs are not sufficient also consider shoring up joists or beams that were cut drilled or notched for pipes wires or ducts.
Shoring up floor joists.
Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall.
Photo by richard howard.
The sagging floor was the symptom and somewhere under the house there had to be a cause.
Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.
Instead it may be an issue with joists and beams below your floor that require shoring up.
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.
Deteriorating floor joists posts or beams can be caused by termite infestation water damage or dry rot.
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.
Your foundation may not be the problem.
To check joists and diagnose the problem a pro must pull up the flooring and the subfloor to see what shape they re in.
Then set new joists same height as existing ones alongside the old.
Stretch a string across the floor to evaluate the amount of deflection then use it as a benchmark for improvement when jacking.
It was nerve racking tom recalls.
By building a wall under joists you divide the span.
Tack a beam under the sagging joists.
Shows raisinge a sagging floor gradually with bottle jacks.
If you build a wall to support joists be sure to place a stud directly and tightly under each joist.
Floor joists and posts support the flooring and damage to them is the most common cause of a sagging floor.
A day until they re level.
By jacking up the ceiling of the basement you.
The longer the distance a joist spans without support the more it will flex.
Place support of the floor joists with wood studs.
For more serious weaknesses you may need to shore up the floor joist structure with a cross beam and lally posts.
In some cases pouring floor leveling compound will fix the problem.
This type of repair may require a building permit and usually requires extensive.
