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Cut & Feather Technique For Driveway Overlays

Standard specifications for installing an interlocking pavingstone system over an existing asphalt or concrete driveway do not require a gravel base except where the driveway meets the street and/or garage apron. In these areas, a necessary amount of the existing material should be removed and replaced with a dense base of quarry process gravel that has been feathered to meet proper grade (3" minus at garage floor/3" minus at curb).

After ruts in the old asphalt or cracks in the old concrete have been filled with stone screenings, follow four simple steps to cut and feather points where the pavingstone system will meet the street, curb or apron. Signs of pumping areas in the asphalt should be addressed with standard vehicular base preparation. Here's how to achieve proper butting and grade:

Step 1. Locate 3" point between a level string line and the existing pavement. See Illustration A.

Step 2. Cut and remove asphalt or concrete between the 3" mark and the garage apron and/or curb.

Step 3. Excavate to 11" minus and prepare 8" (two 4" lifts) of compacted DGA (dense graded base) of quarry process. See Illustrations B and C.

Step 4. Lay SRW® SS5 woven geotextile filter fabric over entire area of existing pavement and added base. The filter fabric will prevent the bedding sand from migrating into future cracks in the underlying asphalt or concrete. You are ready to complete the installation.

Place 1" of C-33 washed concrete leveling sand. Next, lay the pavers. 2 3/8" thick pavers are recommended for residential driveways. Set pavers
1/4" high before compaction for proper compacted finish grade. Compact the pavers into the leveling sand and secure edge restraints along the perimeters of the new pavement. See Illustration D.