The design of the octagon was dictated by property lines and the deck it sits on. The structure was designed to enclose a 7’x7′ therapy pool for my wife, who has MS. It is complete except the roof. I have two 16 gauge eight sided center connectors for the tops and bottoms of the rafters.
Side 1 = 63″ in length
Side 2 = 72″
Side 3 = 61″
Side 4 = 74″
Side 5 = 55″
Side 6 = 53″
Side 7 = 54″
Side 8 = 66″
All walls are 92 3/4″ high and the tops are 2x8s. An image of the structure is attached.
I believe a birds mouth cut at the 2×8 will work, but the cuts have to be angled to attach to the center connectors. This is the point that has me at the limit of my woodworking experience.
If anyone can help me with this project it would be greatly appreciated. Thanks in advance for all help.
Montysan
Replies
Note that knowing the length of the sides does not tell us the shape (which appears to be kinda "squashed").
I think what you need to do is pick a center, erect a temporary pole there, then measure/cut your rafters to reach a standard mark on the pole. With the irregular shape you have it's probably best to attach the centers to a round collar or piece of pole, rather than to attempt to miter them to nest together.
Irregular Octagon
Thanks DanH,
I will remove the pool and erect a pole to find the center by utilizing the center connector on top of pole.
Will let you know my progress.
No need to remove the pool -- you could jury-rig something supported by planks across the top. You just need a reference point at the center.
Irregular Octagon
Hi DanH,
Got an idea last night. I have a umbrella stand and a dowel which will fit it. I will attach one of the center connectors to the top of the dowel and place it and the stand in the pool to find my center. I have jury-rigged a plank across the pool supported by two ladders. Utilizing this setup I should be able to determine lengths and positions for my rafters.
Thanks again for the idea. It is the start point I needed to complete this project. Will post my progress.
irregular octagon
Montysan,
If it would be a help to you, we can 3d model this you. This is a pretty complex undertaking, with several different ways to arrive at a solution - kudos for taking it on!
Let me know if you need assistance. Gratis.
Brent Green
http://www.digiconsoo.com