Concrete Floor Crack Repair Nz

11-05-2021

Concrete Floor Crack Repair Nz

Concrete Floor Cracks Repair
Concrete Floor Crack Repair Epoxy
Concrete Floor Crack Repair Nz Kit
Concrete Floor Crack Repair Material

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Tough as it is, concrete tends to develop small cracks and chips. Minor problems like this generally do not indicate any structural problems that require resurfacing, but it is best to tend to cracks as soon as possible. Once a small crack or chip appears, future wear and tear will only cause it to expand. Here's how to fill a crack 1/4- to 1/2-inch wide. For smaller cracks, follow these instructions.

Difficulty:Easy
Time required:1 to 2 hours

What You Need

Wire brush
Vacuum cleaner or Shop-Vac
Cold chisel
Hammer
Safety glasses
Concrete bonding adhesive
Paintbrush
Sand mix
Trowel

Here's How

With a wire brush, clean the crack. Sweep away any loose debris, then vacuum the crack. If grease, oil or dirt remains in or near the crack, clean it thoroughly.
With a cold chisel and large hammer, undercut the edges of the crack. This will help hold the patch in place. Be sure to wear eye protection.
With a small paint brush, coat the crack surface with concrete bonding adhesive. Allow the adhesive to dry completely.
Mix a suitable amount of sand mix with water as instructed on the bag. (Sand mix is one variety of dried concrete products sold in bags on home stores.)
With a trowel, fill the crack thoroughly with the mixture. Smooth and level the surface.
Allow the patch to cure undisturbed as instructed on the bag.

Concrete flooring will eventually crack. Only the most expertly laid concrete will steer clear of cracking, and even then you're only buying yourself extra time. Factor in additional stresses, such as tree roots, shifting ground, earthquakes, flooding, rising water tables, and the weight of heavy appliances, and the concrete cracking will begin sooner rather than later. Basement floors especially are prone to cracking since they are below-grade areas and thus are closer to tree roots and water tables. It doesn't help that some basement concrete floors are poured quickly and without much attention paid to quality.

Concrete floor patching is your solution to minor cracks that are more about aesthetics, moisture intrusion, and insect infestation than about major structural integrity. Cracks make your basement look bad and they do not help your property's resale value. Rising water can find its way through cracks. Carpenter ants, termites, and even vermin can find their way through cracks. When you patch a cracked concrete slab, your work will look like a patch. It will not blend it with the rest of the floor unless you paint and seal the concrete.

The great thing about concrete patching is that it's an easy job and requires few materials. Not only that, the materials and tools are inexpensive.

Tools and Materials

Concrete or mortar chisel, not a wood chisel
Wooden paint stirring stick
Concrete bonding adhesive, like QuikRete Concrete Bonding Adhesive
Concrete patch compound like DAP 31084 Concrete Patch Interior and Exterior 1-Quart, an inexpensive, easily available concrete patch material
Large sponge
Wire brush
Shop vacuum
Safety glasses
Trowel or large putty knife

Remove Chunks of Concrete

Begin by running your chisel through the crack to remove any obviously loose chunks of concrete. Pull them from the crack with your fingers, if possible, or by knocking them free with a dull screwdriver.

Taper Down the Crack

Use the chisel and hammer to taper down the sides of the crack. This may seem counter-intuitive, but you need to get rid of the unstable edges of this crack and get down to the more solid material. Chipping out the good concrete in these initial stages may give you some pause. But you'll sometimes find that this good concrete isn't so stable after all. Be careful of extending the taper too far, though.

Clean out the Crack

Use a wire brush and a shop vacuum to clean out all the debris from the crack. The crack needs to be completely clean and free of chunks, pebbles, dirt, dust, weeds, and anything that might hinder the adhesion of your patching material.

Concrete Floor Cracks Repair

Apply the Bonding Adhesive

Concrete Floor Crack Repair Epoxy

Brush on a bonding adhesive to the entire crack. Let the adhesive thoroughly dry. Concrete bonding adhesive eliminates the need to roughen up the surface for the new concrete to adhere.

Mix the Concrete Patch Material

Mix up your concrete patch material. Do not use ready-mix concrete such as Quikrete as this is not suitable for patching. Instead, buy a material designed specifically for patching concrete.

Apply the First Layer

Push the concrete patch compound into the crack as far as possible with a paint stirring stick. Make sure that no voids remain in the patch material. Let this deep, below-grade patch material thoroughly harden. The idea with this first layer is to occupy large areas toward the bottom of the crack. Do not bring the patch material up to the level of the concrete floor yet.

Apply the Second Layer

Trowel your next layer of concrete patch compound to bring the patch up to grade. Smooth out the patch with the flat face of your trowel. To further smooth out your work, use a wet sponge while the patching material is still wet. If you wait until the material has dried, it is not possible to work with the material any longer.