The most basic method is to take a piece of tar paper fold it in half and then push that.
Floor sloping away from high spots in beams.
A flashlight aimed at the bottom of the level or straightedge will help you quickly see low spots as the light passes under the level or straightedge.
How to inspect your home when your floors are sloping.
Be suspicious of wood posts set on dirt floors or wood posts with concrete poured around the post bases.
If your marble test indicated a high area where marbles always roll away it could be that a floor joist has bowed upward fortunately one of the simpler structural problems to solve.
Mold and or rot in your crawl space.
Uneven floors are rarely caused by problems with the floor itself.
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They are usually supported in the center of the home by the main beam more on that in the next section.
The cause is usually settling or shifting of the foundation underneath the floors.
If your house is built over a basement first inspect all of the basement support beams and posts where they meet the floor.
Since your room is 12 x 12 it would also be useful to have a straight 2x4 that is 11 10 long.
If the floor beams and joists are made from wood like the ones above a crawl space they will usually bend rather than crack.
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Minor high spots for hardwood and laminate floor installations are easily fixed with tar paper shims.
If you have damaged floor joists you will normally have dips in your floor or high and low spots.
If you place one end of the level or straightedge on the benchmark high spot and slowly rotate the level around the floor you ll discover both low and high spots.
A floor joist is one of the boards that runs under your subfloor from sill plate to sill plate.
When you are using more than one layer of shingles stagger or stair step the shingles.
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