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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...

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...