Octagon Roof Framing Calculator

Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries.

Octagon roof framing calculator.

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. Select and re calculate to display. 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.

Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. Octagon tower ring dxf auto generated dxf cad file of rafter drawing each time script is run. Use it to calculate your gazebo layout. 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.

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