If the area is very large use a long straight 2 in 4 in 5 1 cm 10 2 cm board and set your level on top of it.
How to level out uneven floors.
Whether you want to refinish an uneven basement floor or replace or add new flooring on top of an existing concrete floor somewhere in your home you most likely will need to level the concrete floor.
If the floor is uneven lift up the board until it is level so you ll know how much flooring compound you ll need to even it out.
Installing flooring on an uneven concrete can cause buckling and loose boards after the installation.
Common issues that turn out into uneven floors.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
Adjust the strip as needed.
Floors are rarely perfectly level.
Between this support system stretch floor joists that also support your floors.
Position the leveling strip on the floor and see if the top edge of the strip checks out as level.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
Over time concrete floors can settle unevenly or become uneven due to cracking and moisture.
Filling in gaps cracks and crevices as well as leveling uneven concrete will bring up the aesthetic and shore up the structure of the flooring.
If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to remove the subflooring and shim the joists.
An uneven concrete floor can be unsightly as well as unsafe.
When complete this will be a spacer that bridges the gap between the old floor and the new level surface.