Otherwise lay a very straight metal bar or wood board on the floor and place a level on top.
How to level up hardwood floor.
This will expose the subfloor underneath which is where most leveling problems lie.
If an engineer found no structural issues you may be able to level the floor by applying a cement based self leveling floor product such as henry level pro self leveling underlayment available.
To do this simply cut several leveling strips the same size as the original strip.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Spread the leveler over the floor with a trowel or a gauge rake so it covers each low area completely.
You can leave linoleum or sheet vinyl in place if it s difficult to remove or if removal would damage the sub floor.
Mix the floor leveling compound with water in a bucket following the manufacturer s directions.
Pour a generous amount of mixed leveler onto the subfloor focusing on one or more wavy areas.
If the floor slants irregularly cut strips that bridge the cap at each floor joist.
Use a pry bar to pull up hardwood floors one section at a time or unfasten carpet or laminate and roll it up from one end.
To do this you ll want the longest level you can find.
If the subfloor is the same in both rooms connecting the two rooms with an even floor shouldn t be difficult.
Be suspicious of wood posts set on dirt floors or wood posts with concrete poured around the post bases.
If the level is in the bubble you re ready to go.
Clean it well with a wet dry vacuum.
If your house is built over a basement first inspect all of the basement support beams and posts where they meet the floor.
Use screws to secure the leveling strips to the floor every 16 inches.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
The thickness of hardwood flooring boards is known as the profile and profiles vary.
If the bubble is off raise the low end until it s level.
Pass a long carpenter s level or.
As the posts slowly rot and melt into the floor the house settles accordingly bottom to top.
Screw the strips into the floor joists or subfloor.