Many remodel projects in homes using a concrete foundation and slab call for moving plumbing fixtures, like toilets, sinks and floor drains. Removing the current plumbing leaves holes in the floor that must be filled prior to installing new floors or painting a floor. The job isn’t complex, and with a few labor, concrete mixture and a few tools, you are able to fill the holes and fix the floor so that it mixes with the surrounding concrete slab.
Preparing the Hole
Wear safety glasses. Prepare the edges of the hole by undercutting them using a cold chisel and hammer. Tapering the lower part of the edges outward prevents the new concrete from growing.
Eliminate the chipping dust and brush the rough edges of the concrete using a wire brush. Vacuum the residual debris in the rough edges using a wet-dry vacuum.
Put in a mud base in the hole. Fill the hole to 3 inches under the surface of the slab with plaster mud. Tamp down the mud and moisten it with a modest quantity of water.
Installing the Concrete
Apply a generous number of concrete bonding liquid at the rough edges of the concrete hole using a utility paintbrush.
Add 2 quarts of water into a mixing tub. Insert a 40-pound bag of concrete mixture and mix the stack thoroughly using a scoop. Add water, as needed, so the mixture is medium consistency. Shovel as much concrete into the hole as needed so the wet concrete has a small mound at the very top.
Tamp down the surface of the wet concrete with a single edge of a random item of two-by-four to press on the gravel in the mixture beneath the surface. Work the bit of wood throughout the surface in a sawing motion, from one side of this hole to another, to remove any extra concrete. Shovel the excess into the mixing tub.
Permit the fresh concrete to heal enough to start completing with a steel trowel. Examine the concrete using the tip of a finger. It’s prepared to trowel when the indentation in the finger remains.
Trowel the surface of the concrete, using swirling strokes as opposed to straight strokes. Enable the concrete to cure for half an hour and complete it to your uniform surface, with swirl-strokes and pressure on the trowel.