Roof pitch, rafter length and roof area

Set the span, pitch, building length and overhang to see the rafter length and the roof area to cover.

Works in metric or imperial units.

Learn roof pitch properly

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Questions students ask

What is the minimum pitch for iron sheets?

About 10° for corrugated sheets; tiles usually need 22° or more.

What formula does it use?

Rise = ½ span × tan(pitch); rafter = ½ span ÷ cos(pitch).

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