Backfill Calculator
Material like limestone, sandstone, crushed concrete, seashells or shale should not be used as backfill, because it may break down over time. To begin: Select the backfill material you wish to verify. ... Crushed stone or gravel should be washed, with angular particle sizes no larger than ½" (12.5mm) with no more than 5% passing a #8 sieve ...
