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interlock repair

Interlock can sink over time due to settling of the house, constant pressure from where the tires roll each day, and from standing water that can erode the crushed limestone base that the interlocking stone is laid on. Most commonly: Where your driveway meets the garage floor, where it meets the sidewalk or curb, and along tire depressions. Fixing sunken interlock and relaying the stones is our specialty!

Typically a repair job will include the following steps:

  1. Power Wash stone to remove stains and to remove mud from 4 edges of interlock stone. Ignoring this step sets up (unsightly) uneven lines when relaying the stone because the brick spacing is uneven.
  2. Check the old base to see how much existing bedding there is: patios should be about 4 to 6 inches; driveways should be about 12 inches.
  3. Scrape away top lawyer of old base and compact.
  4. Using string lines, straight pipes and levels, set grade of new base at approximately 1.5 degrees away from home (driveway usually has a bit more slope).
  5. Lay first layer of limestone screenings (crushed limestone), following new grade and compact.
  6. Lay second layer of limestone screenings following new grade and compact.
  7. Lay third layer of limestone screening following new grade and compact.
  8. After the stone is re-laid we run the compactor over the top of the stone one last time to “set” the stone onto the base. After four & five compactions the new base looks solid, concrete-like! These steps are time consuming but essential to establishing a solid base. This base should last you about 15 to 20 years. Some of our competitors will ignore many of these critical steps to save money and increase profits – at the risk of sagging stonework in just a year or two.
  9. Polymeric Sand: we use a high quality polymeric sand to fill in the gaps (joints) between the stones. When activated with a mist of water the sand hardens which strengthens the stonework and prevents unsightly weed growth.
  10. Edging: All stonework must be retained. Otherwise the stone will quickly splay open and move towards the softer lawn & garden edges. As the perimeter edge of the stone moves toward these soft areas the interior stone starts to follow. We use 8 foot strips of L shaped edging strips pinned in place with 1 foot spikes to keep your stonework firmly in place.