Octagon Roof Framing Calculator

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

Octagon roof framing calculator.

Select and re calculate to display. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. Very simple to use. 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.

Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. Use it to calculate your gazebo layout. Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. 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.

This calculator will also calculate the king post radius the king post rise the king post minimum height and the octagon hip rafter to king post length.