With a cold chisel and large hammer undercut the edges of the crack.
Repair cracks in my garage floor.
Another reason for cracks on the floor of your garage is an improperly placed expansion joint.
Chip away at loose concrete and brush off the debris.
Sweep away any loose debris then vacuum the crack.
This will weld the crack together creating an excellent garage floor.
This is easily repaired by injecting silica sand and a compound for floor crack repair into the garage floor crack.
Othertimes the crack will continue getting worse and worse until a structural issue is addressed.
If you see a cracking or rusting pattern in the garage floor that looks like the cracks are 12 to 24 inches apart running in one or two directions it may be an indication that the rebar was place a little too high and doesn t have enough concrete to properly cover the rebar.
One of the best garage floor crack repair epoxy kits is rust oleum s epoxyshield concrete patch repair.
In the first example you fix it and you re done.
This is a two part kit consisting of epoxy and sand.
This mostly happens during the thawing and freezing cycles of the months of winter.
If grease oil or dirt remains in or near the crack clean it thoroughly.
Follow up with a vacuum to make sure the area is dust free.
With a wire brush clean the crack.
Repairing small cracks to repair a small crack in a cement garage floor use regular cement.
In the second example the fix is more of a band aid.
For bigger cracks you can use either an epoxy kit or a polymerized concrete mixture.
Using a hand grinder i leveled the floor on each side of large crack and widened it to the wide of the grinder.
Here s a look at some of the most common reasons for cracks in garage floors.
Apply this to the crack with a putty knife and smooth the surface off to be level with the rest of the floor.
Mix the powder with water to form a paste about the same consistency as toothpaste.
As with repairing garage floor cracks you will need to make sure the damaged area is clean.
Then i filled the deep cracks with cheap fine grain sand to make sure it was full all.
Epoxyshield has a good reputation and is easy to use.
If you think the floor is done moving you can repair those cracks and the shrinkage cracks with a material you inject into the crack and add silica sand for a filler.
Check for stains sealers and wax as these will inhibit adhesion of your chosen material.