Frost-protected shallow foundation near sloping landscape
i am building a house with a frost-protected shallow foundation (see attached) in brandon manitoba canada (49.8485° n, 99.9501° w) and the particular area has a very high water table. because of this, the engineer included the following note: “design assumes ground water level is consistently no less than 3’ below bottom of footings”.
so, just to be on the safe side, i am building up the area for the house approximately 3’. my plan was to have a 4:1 slope from the house to the surrounding landscape (see attached). however, i was starting to wonder how that might affect the ground temperature underneath the slab.
would the frost line push further under the slab due to the lack of soil depth near the edge of the horizontal insulation? if so, is there information available to determine the horizontal insulation required to compensate for that effect?
any information greatly appreciated. thanks!