Problems With Concrete Pavers

Rotated Pavers

• If you choose to install concrete pavers over a bed of sand instead of mortar, the pavers could rotate or slide out of position over time. Installing edge restraints and filling the joints with sand help prevent this from happening. If a section of pavers have already rotated, remove the damaged section and repair the bed of sand so it is smooth. Re-lay the pavers in the existing pattern, and then fit metal, PVC or wood edge restraints against the borders. Use fine sand for the sand joints and pack them down with a broom.

Cracks or Pits

• Cracks and pits can create an eyesore on any concrete surface, including pavers. Sealing pavers with an acrylic sealer prevents this from happening by filling the porous surface and repelling water. Acrylic sealer is one type that allows water vapors to escape so underground moisture doesn't become trapped beneath the surface. If the pavers are already damaged, clean and patch them with vinyl patching compound. Most sealers are applied with a roller brush or spray pump, and should be reapplied every other year.

Frost Heave Damage

• Frost heaves occur when underground water freezes and expands. If the gravel foundation is not below the frost line, the tension can force the pavers to dislodge from the surface, creating a trip hazard. When this occurs, return the paver to its place until the ground de-thaws. To prevent this from occurring again, pry the pavers from the sand bed and excavate the gravel foundation. Contact your municipal office if you don't know the frost line of your area, and dig the foundation at least four inches below the line. You'll need additional gravel to fill the added depth, and it should be compacted so it can better absorb ground tension.

Chipped Pavers

• Concrete pavers can chip if something heavy is dropped on them or if a section is not sealed well. Chipped pavers detract from the appearance of the surface and can get worse if not repaired or replaced. Pry damaged pavers from the sand bed, replace them with new ones, and refill the sand joints. Once replaced, seal the surface to strengthen the concrete so it's not so brittle.