Hi Im in the process of designing my extension, currently i have a rectanglular house with a pitched roof with the ridge running front to back. Now im looking to install build a two story extension directly to the right of the house. Now if i was simply going out from a point, ie at right angles to the ridge i could come stright out, the problem occurs that i am going the full lenght of the existing property. Therefore i was wondering if any one knew it you could have a pitched roof with a flat top. I suppose its on the same basis as a dorma except it has pitched sides. Any help would be great! Scott
Why would you want to put a flat roof on it? What's wrong with two new hips running from the corners of your new extension and a new ridge meeting the old one at the centre?
I think what you mean is a gambrel roof. It would be, in my view, virtually impossible to place a flat roof on a pitched roof in the way you describe. The reason being that water would penetrate on the verges where the pitch met the flat roof. A gambrel roof is a roof that has a pitch beginning at a steepish pitch perhaps 45' and then about 2/3rds up it becomes a shallower pitch say 20'. The advantage of this type of roof is that it gives a lower profile where height may be a problem from a planning point of view. It also gives a very good usable area in a roof for conversion into living space. I hope this is of some use.
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