Site clearing and excavation methods for raised floor systems are no different than for any other conventional foundation system. Compacted backfill should be free of organic materials, including tree stumps or other vegetation, voids, chunks of clay, and should be no more permeable than the surrounding soil.
Raised Floors Can Save Trees
Root-severing slab construction often demands the removal of existing trees in close proximity to the structure. Near a raised floor, however, valuable, beautiful, and energy-saving shade trees can be preserved. Only the footings of a raised pier-and-beam structure penetrate the root system, allowing trees to thrive.