Roof design to maintain South Facing roof

31 May 2016
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United Kingdom
I have a house with a conventional Box roof and a flat roof over the connected garage. The house is west facing, so the main slopes of the roof are North and South. I want to build out over the garage, but I want to maintain a south facing roof as its perfect for a PV install

It looks a bit like this


I really don like the idea of an M shaped roof as the gullies seem to be a recipe for leaks in properties I've seen.


any ideas?

As you are now allowed to go up, I was even thinking about extending the roof up and maintaining the single box roof, this would give me a loft extension option also.
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