Rooflight in dormer flatroof

[al145]

Hi! I’m looking to install a rooflight on a dormer flat roof. I believe a 150mm upstand minimum is required to hold the rooflight. Having that 150mm takes me right up to the ridge of the roof which id like to avoid as after the skylight it’ll probably be above.

Is there some design where I can use a smaller upstand - perhaps through some other clever roof design?

 

[Mw Roofline]

I don’t think you can have anything protruding the ridgeline if it’s facing a general highway. I know it might only be a few inches but might be worth checking with the local authority first.