Birdsmouth depth conundrum

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29 Aug 2022
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My building plans call for 150 x 50 mm rafters and 300 x 100mm hip rafters on an irregular bastard roof for an extension measuring 5.9m long by 3.5 m wide so the roof has a pitch of 20 deg on the short side and 15 deg on the long side.

To achieve these pitches the 150mm rafters require a 50 mm birdsmouth leaving the required 2 thirds height to sole plate of 100mm.

My conundrum is this means that the 300mm hip rafter must have a sole plate cut much deeper than 2 thirds it’s width. Is this ok, especially if the tail of the hip rafter sits on the outer wall?

I can send photos help explain the issue and look forward to your comments.

Could also attach photos to this thread if I knew how

Cheers
 

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