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Frequently Asked Questions

May 27, 2015

Q. What is the base made of? What type should I Use

A. The base is typically made of compacted, crushed stone that varies in size from one inch (25 mm) down to dust. Base materials used under asphalt street pavements are acceptable for use with interlocking concrete pavements. Some parts of the country use cement stabilized or concrete bases due to very weak or slow draining soils. However, most applications use a crushed stone base that’s compacted.

Q. I recently removed old pavement, and there is already stone underneath. If properly compacted, can I lay pavers over it?

A. This is not usually recommended. If the existing pavement is rutted, deformed, uneven or severely damaged, the base or sub-grade underneath the original installation is likely inadequate. Remember that the subgrade and base are the most important part of an interlocking concrete pavement. ICP’s are flexible pavements, and as such, rely on load distribution in the base and adequate support from the soil subgrade. Sometimes the stresses on the pavement are from below, especially in freeze thaw areas of the country, so even residential patios and sidewalks need to have a proper base.

ICPI recommends a minimum base thickness of 4 inches (100 mm) for residential patios and walkways and 6 inches (150 mm) for driveways in non freeze thaw areas. In colder climates these base thicknesses are increased and most contractors will use 6 and 10 inches (150 mm and 250 mm) respectively. Gradation is another factor. The ICPI only recommends the use of base material meeting gradation requirements of ASTM-D2940 with 6 to 12% passing the no. 200 (80 micron) sieve.

If you have any specific questions, feel free to contact one of our knowledgeable sales representatives.

CastleLite Block-Proudly serving the San Francisco Bay Area(North Bay, South Bay, East Bay & Peninsula), Sacramento, Redding, Reno/Lake Tahoe, Monterey & surrounding areas.

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