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With it mounted on your roof how are you going to brace the building to handle the wind load?
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I plan to involve several of the adjacent roof trusses to spread the load. My initial thoughts have been to furl near 25mph. At 25mph I've calculated around 27 lbs of turbine thrust. If I decide to furl around 30mph, forces are around 40lbs. Furling will then tend to have a governing effect on most of the turbine thrust.
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Also the basic rule of 50 feet above anything within 500 feet treats the top of the roof as you would treat the ground level
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That maybe ideal, but isn't practical for me at this time. Eventually a tall tower out in my back field will be great.