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Roof nailing
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Fix the roofing iron to the purlins (m) with appropriate roofing nails/screws.
Fix to the top and bottom purlins at every second corrugation
and fix to the intermediate purlins at every 3rd or 4th corrugation.
Fix through the high side of the corrugation.
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Roof overhang
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Overhang the roofing approx 65 (2 1/2") past the fascia board (fa) or 50 (2") past the back of the gutter.
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Ridge flashing
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Usually standard about 130 (5") each side of the apex but can vary and any size can be made to order.
Have the ridge flashing in mind when positioning the top purlin. Fix to the purlin at every second corrugation.
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Barge flashing
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The barge flashing goes under the ridge flashing at the top. Fix to each purlin (through two corrugations) and also to the barge board (ba).
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