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Concrete foundations around the perimeter of a building serve two functions. First, they support the building. Second, if they are constructed correctly and deep enough, they will maintain the soil under the structure at temperatures above freezing, thus avoiding the heaving that comes with unprotected soils.
I'm not familiar with the system you mentioned, but I can tell you that any structure built on a slab without frost protection of some kind may be subjected to movement of the earth during the freeze/thaw cycle. Here in New England (Greater Boston area) we have many homes that were built on slabs in the latter part of the 50's and early 60's. Incorporated into the design of these homes was a poured concrete foundation extending into the ground only far enough (48") to protect the soils under the house from freezing, and not deep enough to provide a basement.
[This message has been edited by treebeard (edited April 14, 2003).]