Building codes specify the minimum joist depth and spacing typically 12 or 16 inches on center for spans up to 20 feet but those requirements are intended to prevent plaster ceilings from cracking not to eliminate springy floors.
Straigthen tilted floors old house.
The ground level at the rear of the house is a few inches below the basement floor level.
The best way to limit annoying flex in a floor is to make sure that joists are sized correctly before a house or addition is built.
Floors that dip in the middle are usually caused by non structurally significant joist deflection but sloped or tilted floors that are straight i e slope in one direction may indicate a more serious foundation or bearing wall problem.
Jack up the floor slightly and knock out the existing post.
In the example of the house foundation if the house was built over a crawlspace or basement it is possible to get into the crawlspace or basement to insert jacks and raise the foundation.
Although most floors slope it is important to know how much and why.
In this video this old house general contractor tom silva explains how to repair a skewed door.
Steps to repair a skewed door.
Where the floor is high place the floor jack on a block of wood and directly under the support beam.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Determine which hinge must be shimmed to adjust door and create even spacing.
You may have a concrete slab patio driveway or portion of a house foundation that has sunken or tilted over the years.
That corner would be the lowest on the slope.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
There are several problems that can cause a sagging or sloping floor which is one of the reasons why fixing a sloping floor is difficult.
Close door and check the spacing at the top and latch side of the door.
Don t jack it up too high just high enough to remove the post.
The house seems to be tilting to the rear and to the south.
Check out the previous episode where we discuss the plans for this kitchen.
The average person can sense if a floor slopes 1 inch in 10 feet and sloping floors or sagging floors are often one of the warning signs that structural engineers look for when analyzing a house.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.