Someone recommended that I use a fabric under my installation. When and where is it used?

EP Henry recommends a geotextile separation fabric (e.g., Mirafi® 500x) under all paver installations. The fabric is laid on top of the compacted soil in the excavated area and keeps the aggregate base material from working its way into the soil subgrade. This is especially important where the soil contains a lot of clay. At a cost of pennies per square foot, the separation fabric provides an insurance policy against base failure.

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