Minor high spots for hardwood and laminate floor installations are easily fixed with tar paper shims.
Floor sloping away from high spots in beams.
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.
Be suspicious of wood posts set on dirt floors or wood posts with concrete poured around the post bases.
How to inspect your home when your floors are sloping.
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.
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.
If the floor beams and joists are made from wood like the ones above a crawl space they will usually bend rather than crack.
Mold and or rot in your crawl space.
If you have damaged floor joists you will normally have dips in your floor or high and low spots.
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If your house is built over a basement first inspect all of the basement support beams and posts where they meet the floor.
The most basic method is to take a piece of tar paper fold it in half and then push that.
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This may require either sanding high spots or shimming with shingles in the low spots to build them up.
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Since your room is 12 x 12 it would also be useful to have a straight 2x4 that is 11 10 long.
The cause is usually settling or shifting of the foundation underneath the floors.
A floor joist is one of the boards that runs under your subfloor from sill plate to sill plate.
Using the long 2x4 and the 4 foot level you should be able to find the high spots and the low spots on your floor.
To shim the floor take a straightedge or a level and look for imperfections in the flatness of the floor and determine if it needs to be raised or lowered.
Uneven floors are rarely caused by problems with the floor itself.