How much frost protection should I have?

Foundation systems should be four (4) feet minimum below grade to protect from frost.

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1. How long is a permit valid?
2. How many person(s) are allowed per habitable room?
3. Can my roof support the installation of a solar panel?
4. What are the stair riser and tread requirements?
5. When is a guardrail required?
6. When are graspable handrails required?
7. How much frost protection should I have?
8. What R-Values should I insulate to?
9. What are ground snow load and wind speed requirements?
10. What size does a bedroom egress window have to be?