If floor sloping is limited to the first story of the house that is there is no corresponding slope to the 2nd story floor then the reason could be missing support posts and damaged joists.
The first floor slanted.
Foundation issues deteriorating wood supports especially sills which rest on the foundation footer improperly installed joists or sub floors and other issues can all cause a floor to slope or sag.
However if the second floor slopes along with the first floor then there could be a more serious structural cause such as foundation damage or settlement.
How to inspect your home when your floors are sloping.
In some cases the slope is caused or aggravated by similar deflection in the girder main bearing beam that supports one end of the joist sets but even this scenario there is usually not a problem that needs repair.
Sometimes you may notice sloping only on the second story of the structure.
Supporting post or beams have been removed modified or cracked.
Floors that slope 2 or 3 inches in 20 feet would be a very serious concern.
Sloping on the second floor.
A slant slope situation might be one where over the course of 15 or 20 horizontal feet the floor slopes down one or two inches.
Floors that slant or slope floor slopes and slants are common in old houses.
Nearly all will say that if a floor slopes 1 and 1 2 inches in twenty feet or more that there should be further investigation.
Be suspicious of wood posts set on dirt floors or wood posts with concrete poured around the post bases.
Sloping floors are most often caused by normal and acceptable deflection bend in the wood joists which comprise the floor structure.
As you move into the room further in from the door it starts to level out.
Except for that slope the floor itself might be flat.
Water damage pest termites or deterioration exist.
Floor joist are damaged undersized or over spaced.
Sloping floors in the first story.
It might also be difficult to find the right company to do the job.
On the first floor bedroom the floor slopes down by about 5cm from the start of the door frame to the wall.
There are lots of reasons that might cause sloping floors in a.
Load bearing walls being modified moved or removed.
The top of the door frame is also sloped down.
If your house is built over a basement first inspect all of the basement support beams and posts where they meet the floor.
Sloping on the first floor.
If the first floor is level and the second floor slopes then there is a possibility of.
If there is sloping on the second floor though there could be serious structural issues that need to be addressed.
This is not a quick fix and for a first time homeowner with a limited budget and not much experience with houses i d stay away.