I have recently purchased an older home (1970) with foundation issues. I have remediated most of the interior issues with either epoxy or urthethane injections, along with anchors. I have also installed new gutters and ran the drains 15+ feet away from the house. However, the house was built without any type of drainage system, and I am planning on excavating one wall to waterproof the exterior of the foundation wall. While performing this excavation I thought it prudent to install 4″ drain tile alongside the footing of the foundation, the issue i have is that I have no where for the water to drain (no interior sump system, and can’t run to daylight), therefore I was going to put in an exterior sump system. The footing runs about 5-6′ below grade. My questions are:
How much deeper should I dig the pit to allow for proper drainage and fill (2-3′ was my assumption filling with gravel).
If the pit is this deep (8′-9′), do I have to worry about the pit water freezing or the pumps breaking in the extreme cold temps? will a well insulated cover and the depth of the pit help these situations? (frost line has never reached below 36″ in my area)
What can be done to keep the evac pvc line out of the pit from freezing (if I am pumping straight to the surface and away from the home)? – one idea i Had was to keep the evac line below the frost line, and pump to a dry well further out into the yard? although this would require two rather large holes and a large trench?
I really appreciate any help in this matter.
The soil type is a hard clay.