I've replaced some DWV lines under my slab (2"-4"). New lines are PVC and the old stuff is CI. The backfill that was there was just the native clay soil (plus several large pieces of leftover cinder block). This was topped with plastic and a thin layer of gravel.
If you were going to backfill, what would you use? I am not sure if it matters, but the ground water level can come above the pipes. This is a walkout basement and water has come a few inches above the pipes while the trench has been open during heavy rains or after a good snow melt.
House is about 40 years old. I'll be having the inspection and doing the pressure test (water) early next week and will then be ready to backfill.
Thanks.
If you were going to backfill, what would you use? I am not sure if it matters, but the ground water level can come above the pipes. This is a walkout basement and water has come a few inches above the pipes while the trench has been open during heavy rains or after a good snow melt.
House is about 40 years old. I'll be having the inspection and doing the pressure test (water) early next week and will then be ready to backfill.
Thanks.