I am not a builder by trade but I am building my own house & shop on the outskirts of the Phoenix metro area (two separate structures). I am going to be backfilling soon so figured I better get some input on waterproofing.
Both buildings are dug into a hillside in a daylight / walkout fashion. They are constructed of Rastra which is an ICF type product.
Obviously, since we are in the desert, ground water is not really an issue. We do get some tremendous monsoon weather and some winter rains, but that rarely soaks in more than a few inches. With that in mind, waterproofing is probably unnecessary. But much cheaper to do now than wish later.
My plan is to coat the exterior with a smooth coat of stucco. Then apply waterproofing material of choice. A perforated foundation drain is in place. Site drainage will divert runoff away from the uphill side of the buildings.
So now to open the can of worms… what products do folks recommend considering the local climate. Is rolled/sprayed on asphault based adequate? What is the price premium for one of the membrane products? No matter what the product, do they need some sort of protection during backfill?
Thanks in advance.