Roof Framing Geometry

However it has over 1 000 geometric roof framing drawings in the book as well for carpenters that are not comfortable using trigonometry.

Roof framing geometry.

You ll need to draw out the roof framing geometry. Gambrel roof framing geometry calculator metric this gambrel roof confines to a semicircle and starts as the top half of an equal sided octagon. For complex roof framing trigonometry or geometry must be used. With overhang selected drag slider to increment decrement birdsmouth seat width to suit.

There are smartphone apps available which can be used to sight a roof s pitch from the ground. The central angle for an octagon roof is 45. Roof framing geometry is empirical type knowledge. There is more trigonometry in this book than all of the roof framing books written in english combined.

The pitch or steepness of a roof is often referred to in terms of the amount of vertical rise over a 12 horizontal run. It will take more than just reading to understand roof framing geometry. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape. One half of 45 is 22 5.

For example a 5 12 pitch roof will rise vertically 5 for every 12 it goes back horizontally. Information gained by means of observation experience or experiment.