[jeff5may]

There is a big difference between pushing the envelope and pushing your luck. It is in the architect's hands to tell the difference. Pushing and stacking the odds with a device made to last 50 years or so sounds rather unwise to me. Redefining the envelope doesn't mean what you're doing is wise. A prudent judgement must be made by a competent professional as to whether or not a specific site is suitable for the conditions at hand.