How to build a reciprocal roof

Coming Soon! In this page we will describe to you how to build a basic understanding of reciprocal roof construction with step by step instructions.


This page is intended to show the basic How-To's of installing a reciprocal roof on a structure.

The reciprocal roof lends itself to round walled structures. This structure is a hexagon, although, an octagon, decagon, or vertex-less/circular one would make installation easier. The reason being that the reciprocal roof pitch is determined by the x distance from the top plate to the tangent of the center ring where the rafters lay reciprocating over each other. If the x distance changes, ex: in a square with four corners the x distance from the center point of the square to the edges of the square box are not equal. It is a greater distance from the center to the corner than to the center of a face/side of the square. Therefore, the pitch of the roof will be shallower at the corners and steeper at the faces. In theory, the non sided circle is the best way to achieve an even pitch around the whole structure making a conical roof.
In this hexagonal structure built in a series of community workshops the roof pitch does vary slightly from vertex to face; but this can be mitigated slightly by placing the rafters a distance away from the vertices. It is good building practice to place the rafters a distance away from the vertices for strength in holding wood in attaching the rafter to the top plate or beam.
Enjoy this How-To for educational purposes, if this page does not help or if you are looking for more, here is another reciprocal roof how to with blog The year of Mud Reciprocal Roof Blog, enjoy.