Proper Drainage & Waterproof Membrane For New Concrete FoundationFebruary 27th 2007
Q. We are building a house in a low lying area which is sitting on 22 feet of sand before it hits the clay. I intend to slope the ground away from the foundation and I am wondering if it is necessary to put in weeping tile. We have a 4 foot crawl space.
A. Yes, please plan on drain tiles as well as applying a water proof membrane over all below grade concrete foundation walls. Drains may be drained to the down slope at the rear of the lot. There are services available that specialize in drainage. Contact your local Home Builder's Association to find a reputable company in your area.
Also, please consider insulating the concrete walls in the crawlspace with 1 1/2" rigid foam insulation, application using foam adhesive.