Backfilling for basement waterproofing projects

Materials needed: pea gravel or crushed stone, sand, gravel, felt paper, top soil, cart, shovel, rake

After the drain pipes have been laid and connected to an outlet, double check the system using a four-foot level to make sure the water will flow toward the outlet.

The material used for backfilling should encourage rapid drainage to the pipes. DO NOT shovel dirt back into the trench.

Backfill with these materials:
-6″ of pea gravel or crushed stone on top of the pipe
-12″ of sand travel filled to within 24″ of the surface
-a layer of felt paper
-24″ of topsoil graded at the surface away from the house

After the first several rains, inspect the area for any slight settling and have enough extra topsoil to fill in any small holes or depressions. Minor settling is expected as the gravel and sand work their way into permanent position.