Internal Hip Drain

Old 05-17-09, 05:44 PM
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Internal Hip Drain


I have an existing house with an L shaped floor plan. The existing roof is configured in a hip structure over the whole plan area
I wish to extend the house by building an additional room, filling in the space made by the L and resulting in a rectangular plan view of the house in total.

I want to minimise the roof integration required by this additional extension to the existing roof in order to minimise cost and complication.

I am after some advise as to whether it is practical to integrate the new part of the roof in a hip configuration and by doing so create an internal V drain along one edge of the existing L shape roof at roughly eve level, about 6 metres long. Hence the resulting x sectional elevation view through this area would resemble an M shape, with the centre of the M, a V drain and trusses on either side. While I can construct it in this fashion the issue I want to underatnd is whether this configuration will cause me future problems with potential leakage into the house in and around the V drain due to drain overloading in times of high rainfall or joins etc. There do not seem to be many practical examples of this type of roof design out there but I have seen some examples.

Can anyone advise me on this issue?
Old 05-18-09, 04:12 PM
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filling in the space made by the L and resulting in a rectangular plan view of the house in total. You lost me there. Yes, it does sound like a leak, for sure. Be safe, G
Old 05-18-09, 05:24 PM
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If I understand you correctly, you may want to install a cricket at the intersection of the two adjacent fields in the middle of the "M":

and appropriately sized conductor boxes and downspouts at each end (the roof in the picture above is not a good design as a directs concentrated water flow across the shingles each end, in your design presumably the intersection of the roof planes would extend to the eaves).


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