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. Over time concrete floors can settle unevenly or become uneven due to cracking and moisture. 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.

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. Place heavy duty floor jacks under the low spots. 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.

To resurface an uneven concrete slab begin by laying a long straight 2x4 wooden rail across the concrete slab floor with one end positioned on the high point in the room.