Am I correct that the soil compaction test is performed after the hole is dug for the basement? How much can I expect to pay for the test?
So it looks like no one is doing a soil compaction test before the foundation goes down.
Re-bar is cheap insurance and not a bad thing to do anyway. Years ago I dug many foundation holes and ran a compactor around and that was all that was needed as long as you were on virgin soil. If you have to bring in fill to level a foundation hole, that is where you need testing.
Absolutely on any fill. I would also "assume" that in freeze climates rebar probably is a code requirement.
These guys give good advice Hank, on virgin ground, soil compact tests are kind of reinventing the wheel, as local codes account for local soil compression. The answer to any questionable scenario is re-bar, so just add it if you have doubt.
Frost is irrelavant, even in slabs, as code has you go below 24" or more for footers ( under frost level).
The only problems with foundation I am familiar with in my experience,(not my project thank God) was a house built to code, but built on a coal mine filled in 30 years prior.
Ray you are correct on your answer. I know in NC in my zone we only have to go 8 inches below frost. I have heard of some zones that require 36 inches. In Southern VA near the Blue Ridge its 18 inches and two bars of # 4 are required. If you take a probe and you can penetrate 2-4 inches into virgin soil I would be installing rebar. If It is significantly more than that a soil scientist should be consulted.