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.

Octagon roof framing calculator.

Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. The octagon layout calculator is a handy carpenter s tool for laying out a perfect octagon. Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries. 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.

Use it to calculate your gazebo layout. Very simple to use. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. 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.

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