Octagon Roof Framing Detail

How to draw any polygon with an compass straight edge.

Octagon roof framing detail.

The hip rafter angle is not the same as a 90 plan angle. In this example the octagon segments are 4 ft. First i figure out the framing dimensions with a calculator. The octagon plan angle is 67 50.

The central angle for an octagon roof is 45. 1 8 pitch is given so 24 x 1 8 equals 3 or unit of rise in inches. The octagon you are framing is an irregular octagon i conveniently choose 24 as the overall width of the square as well as the octagon to make the run of a common rafter 12 bc in the square ef in the octagon to find the run of the hip rafter ab in the square we could use the pathagorean theorem or we could use some simple trig. What more could your heart desire in a gazebo.

But once you step inside it has a great space for sitting resting or even sleeping. It has a raised floor and an interesting roof line that catches your attention at first glance. Line length is the hyptenuse of the triangle whose. 18 use 2 x 6 etc.

If the unit of rise in inches is 3 then the cut is the unit of rise and the unit of run 12 inches or 3 12. 8 10 roof rafters are 2 x 4. 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. 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.

The drawing shows standard details for an octagon wooden gazebo. There are many differences between the gazebo shown and others many features will change between. Long and combine to create a base width of 9 ft. Figure 2 2 roof framing terms.

6 159 on the tongue and 10 on the body to draw out the plumb and level cuts of the octagon hip rafter. The hip rafter pitch is the common rafter pitch over 13 in like 8in 13in for an 8in 12in roof pitch. One half of 45 is 22 5. Or they could have purchased a chappell master framing square that has the hexagon and octagon roof framing information printed on the square.

Oval octagon rectangular and square gazebos number of pieces and framing of floors and roofs larger and smaller gazebos i e. Using the chappell master framing square line 1 under 8 12 6159.