Frame Octagon Roof

The tangent of 22 5 41421 laying out an octagon using a framing square we would take 12 on the blade and the number to be taken on the tongue is 12 41421 which is 4 97 or nearly 5.

Frame octagon roof. 6 159 on the tongue and 10 on the body to draw out the plumb and level cuts of the octagon hip rafter. Using the chappell master framing square line 1 under 8 12 6159. Framing an octagonal turret roof fine homebuilding there s no denying that an octagonal turret roof is a challenging project. The central angle for an octagon roof is 45.

An octagonal plan in this example the octagon segments are 4 ft. For instance if your roof has a steep pitch you may be able to use 2 inch by 4 inch rafters but if your roof has a low pitch building code may require that you used 2 inch by 6 inch or 2 inch by 8. How to draw any polygon with an compass straight edge. Or they could have purchased a chappell master framing square that has the hexagon and octagon roof framing information printed on the square.

Learn rick s method for framing an octagonal turret roof. For low pitch roofs building codes may require larger dimension rafters. For builder rick arnold taking a little more time to understand the framing was all he needed to get started on a successful project. The entire gazebo is constructed out of rough sawn not dressed smoothed or surfaced lumber which in most parts is readily available and cheaper than dressed lumber.

Due to the turret s location only half of the rafters are extended into tails that form the soffit. A total of eight common and eight hip rafters make a roof with a 20 in 12 pitch. Long and combine to create a base width of 9 ft. One half of 45 is 22 5.

Watch this video for a virtual tour of an octagonal roof framing model created in sketchup for the exploring octagonal roof framing tutorial at the digital.