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.
Floor sloping away from high spots in beams.
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A floor joist is one of the boards that runs under your subfloor from sill plate to sill plate.
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 house is built over a basement first inspect all of the basement support beams and posts where they meet the floor.
When you are using more than one layer of shingles stagger or stair step the shingles.
Uneven floors are rarely caused by problems with the floor itself.
This may require either sanding high spots or shimming with shingles in the low spots to build them up.
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.
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.
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The cause is usually settling or shifting of the foundation underneath the floors.
They are usually supported in the center of the home by the main beam more on that in the next section.
Be suspicious of wood posts set on dirt floors or wood posts with concrete poured around the post bases.
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If the floor beams and joists are made from wood like the ones above a crawl space they will usually bend rather than crack.
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.
Since your room is 12 x 12 it would also be useful to have a straight 2x4 that is 11 10 long.
The most basic method is to take a piece of tar paper fold it in half and then push that.
How to inspect your home when your floors are sloping.
If you have damaged floor joists you will normally have dips in your floor or high and low spots.