In our area, building code dictates that foundation perimeter drains are mandatory on new construction, but even if they were not required, I could not imagine building a new home without a perimeter drain.
In addition to protecting the footing and foundation walls from destabilization from water drainage, the perforated pipe installed in crushed stone utilized for the drain system is an ideal way to incorporate a passive vent system to eliminate potentially dangerous soil gases, like Radon from entering the building envelope. (Learn more about Radon at this EPA website.)
- We also typically tie gutter downspouts and basement floor drains to the gravity based system as well.
- Our systems rely on backfilling the foundation excavation with clean sand to ensure any water will drain through the sand and enter the drain rather than stand against the foundation walls where potential problems could occur.
- A sloped site will be ideal to lead drainage water away from the house through a well designed system.