How To Fill In Cracks In Concrete Floor. How to Caulk Concrete. If the crack is deep fill the crack in layers.
When adding these materials fill the crack to within a ΒΌ inch of the surface to allow room for the filler. Give the product time to cure dry between applications. As you can probably tell by the name of it this material is designed to expand just like insulation foam for walls.
As the urethane is injected it begins to foam and expand to completely fill the inside of the crack.
Feather the edges to get the best appearance. Just before carpeting I had to get these cracks and holes sorted. For small cracks that dont require a backer rod you will need only to fill the crack with several applications of concrete sealer. If the crack is deep fill the crack in layers.
