Over the last 2 days we have set out and constructed a half octagon roof. To start of with i thought it was really easy and things were going good but then we found out we had been led in the wrong direction. We decided that 3 sides had to be exactly the same for this to work and that it wasn't the half span. The other 2 sides were the returns going back towards the ridge and it made sense to have them half the length as the other 3. The length of the sides worked out to be about 40.5 percent of the full span but that's not how we figured it out.
Once all the plates were set out we cut the rafters and because the ridges was already up the rafters centered the plates. We then did the 2 hips which had to have a side cut of 17 degrees. after that we did the jack and then cut the last 2 hips. Once the last 2 hips were in we cut trimmers for between 2 of the hips on each side to pick up another 2 jacks. After all that the only thing left to do was cut the under purlins But we had to work out the cuts first. I managed to find out that the down cut and the side cut were the same at 16 degrees.
Once all the plates were set out we cut the rafters and because the ridges was already up the rafters centered the plates. We then did the 2 hips which had to have a side cut of 17 degrees. after that we did the jack and then cut the last 2 hips. Once the last 2 hips were in we cut trimmers for between 2 of the hips on each side to pick up another 2 jacks. After all that the only thing left to do was cut the under purlins But we had to work out the cuts first. I managed to find out that the down cut and the side cut were the same at 16 degrees.
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