Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same.
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 tower ring dxf auto generated dxf cad file of rafter drawing each time script is run.
Supported octagon roof framing dimensions octagon 4 butt hip rafter dimensions.
Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results.
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.
Select and re calculate to display.
The octagon layout calculator is a handy carpenter s tool for laying out a perfect octagon.
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.