How To Level A Concrete Floor This Old House

Run a line outside the house and mark the low spots in the foundation.

How to level a concrete floor this old house.

Slip shims under the low end of the 2x4 rail until it s perfectly level then use a scribing tool to transfer the unevenness of the floor onto the rail. Simply pouring wet concrete into a hole in your driveway sidewalk or basement floor won t make for a lasting repair. You can level an existing concrete floor with a leveling layer of new concrete but you must prepare the old concrete floor first. Over time concrete floors can settle unevenly or become uneven due to cracking and moisture.

Holes 1 inch or deeper require a concrete mix with coarse crushed stone aggregate which bonds well with existing concrete. You have to prep the edges correctly and use the right materials. Neglecting to prepare the old surface will prevent the new concrete from adhering correctly resulting in a weak bond between the two layers. 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.

Assign a person to each jack and raise the jacks slowly and at the same time until the spirit level shows the house is level.