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Thanks Ron, I'll stick with the standard guidelines.

Thanks Mike & TXStructural. I was hoping for an answer that said yes, more turbulent flow on the roof would reduce the airspeed and therefore likelihood of it detaching, so that I could reduce the structure but .. its better to know the answer than not. Cheers

Would creating turbulence on a flat roof by installing multiple small ridges reduce the likelihood of the roof lifting in a strong wind?