I am trying to find some type of map which show the actual depth of frost for different areas, maybe a break down by county (USA). I am from Mass, the state building code states 4'-0" foundation depth accross the entire state. I am looking for something that would give some actual depth of frost for the coastal area. Inaddition, I am finding that older versions of the building code allowed a foundation depth of 3'-6", now as people add on to their house, we find that their foundation depth does not meet the current code. As a structural, I feel the need of a Geotechnical review. For a home owner who wants to add say a 20'x20' addition this is complex and costly problem. I have searched every web site I could think of. Thank You in advance.
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