Gravel under concrete footing - GreenBuildingAdvisorApr 1, 2015 . I am trying to finalize several aspects of the foundation design for the . a poly vapor barrier under the poured basement slab (XPS will continue around . Crusher-run gravel compacts well but does not drain very fast -- at least.crusher run for slab base,What base material under concrete slab? - DoItYourself .Sep 10, 2013 . I've laid concrete slabs in the past. . The plan is 3 1/2" of concrete over a base material. . That picture looks like what we call crush and run.PA Stone Product Descriptions and UsesDriveway, parking lot base & farm lane, utility trench backfill, compactable; 4" or greater placement . Sewer system stone, drain pipe bedding, under concrete slabs and sidewalks, asphalt mixes. AASHTO # . CR-6 (Crusher Run)DELDOT &.
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