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Hip Roof Lengths & Cuts Calculator

Plan Dimensions

Half Span

mm

Overhang

mm

Rafter Thickness

mm

Ridgeboard Thickness

mm

Top Lengths

Birdsmouth

Total

Rafter

- -

End Jack

- -

Hip & Valley

- -

'Top length' measurements are applied to the tops of the specified members.

The lengths include deductions for rafter and ridge thickness, plumb cuts and add any specified overhang.

Cuts

Plumb

Side

Rafter & Creeper

- -

Hip

- -

Down

Side

Purlin

- -

The 100 × _ mm values can be scribed to create a diagonal line to set your bevel angle.

Creeper Rafter

Spacing

Length Difference

Creeper Length Difference

mm -

For each pair of creeper rafters with the spacing above, the length difference is provided. Spacing is measured between the rafter edges facing the same side.