What is the type of fill that should be used to surround the chamber and fill over the top of a CULTEC Stormwater System?
Traffic applications are to be surrounded in stone. 1 2 inch diameter clean washed broken stone should be used for the stone base, to surround the chambers and exceed the chamber crown by 6 inches in a CULTEC Stormwater System Traffic and/or H20 Application. However, native soil or select fill may surround Standard Duty units for non-traffic applications as long as the storage is not calculated to include the storage provided by a 40% stone void. 95% compacted fill free of large stones and debris may be used as final backfill material.
