Force the thick paste into the cracks with a putty knife.
Concrete floor old house.
For hairline cracks up to 1 8 inch wide mix four parts of ardex concrete dressing to one part water.
How to fix up old concrete floors.
Patch all cracks crevices and holes in the old concrete surface.
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.
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.
Step 1 fill the cracks.
The surface temperature of the existing concrete must be at least 50 f.