Octagon Roof Framing Calculator

The octagon layout calculator is a handy carpenter s tool for laying out a perfect octagon.

Octagon roof framing calculator.

This octagon tower rafter script calculator will return the octagon rafter geometry angles and trigonometry rafter measurements for octagon tower roof framing with a structural ring support. Fraction precision set 1 8 1 16 1 32 1 64 decimal inch metric all inch inputs and dimensions are actual physical finished sizes unless otherwise noted. Select and re calculate to display. Supported octagon roof framing dimensions octagon 4 butt hip rafter dimensions.

Very simple to use. Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. Octagon tower ring dxf auto generated dxf cad file of rafter drawing each time script is run.

The hip rafter pitch is the common rafter pitch over 13 in like 8in 13in for an 8in 12in roof pitch.