With it mounted on your roof how are you going to brace the building to handle the wind load? a turbine prop is, from a load point of view seen as a solid disk or sail when the wind is hitting it, that can be alot of force.
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, just like if you put a turbine up in a forest you need to be 50 feet above the top of the tree line, otherwise you get turbulence and enough variation in wind speed that the machine will rip it's self appart, why? a 1mph difference in wind speed at 12mph is almost twice the force pushing on the blades, so if the top tip is seeing 12mph and the bottom tip is seeing 11mph that top tip, at 50 feet in the air this is not uncommon to see, at 10 feet in the air I can't say exactly what the difference is going to be but I'd like to see a video of it.
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