How to build an Octagon Roof
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- เผยแพร่เมื่อ 8 ก.ค. 2024
- Learn the secrets to framing octagon roofs using Roof Framer’s Bible.
To buy Roof Framer’s Bible: roofbible.com/
To buy: Roof Cutter's Secrets, by Will Holladay
www.amazon.com/Roof-Cutters-S...
0:00 Intro
0:18 The easy way with Roof Framer’s Bible
1:00 Octagon chart explained
5:13 Building walls of octagon
8:34 Two ways of framing center point
11:14 Laying out common rafters
12:50 Hip rafter run
13:33 Pitch of the hip rafter
14:12 Cutting hip rafters
15:40 Roof sheathing cuts
16:04 Polygons are easy
16:34 Get Roof Cutter’s Secrets
Author’s Bio:Barry Mussell started framing houses over forty years ago. He built over 300 homes and commercial buildings with his own hands, before taking on the role of Framing Manager for a large home builder. He trained and supervised hundreds of framing crews who built more than 18,000 homes across the southeastern United States. Thirty years ago he wrote Roof Framer’s Bible - The Complete Pocket Reference to Roof Framing. It has been sold all over the world. He is now focused on training the next generation of carpenters and tradesmen. - แนวปฏิบัติและการใช้ชีวิต
Thanks for watching! Be sure to check out our playlist for all of our videos.
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Strongly consider putting this info into an app for your cell phone. I wish you success and want to thank you for helping me be a better carpenter. I have been at it for 33 years and still try to learn and hone my craft.
Can"t wait until you do a video on sheathing the roof .I love the videos
Thanks for watching!
Another Excellent Video!! God Bless
Thanks for watching!
Ordered the Roof Framers Bible to support your channel, enjoy the videos
Thank you! I'm glad the videos are helpful.
you are the man
Got the book and it's a great go to to have.
Great! I'm glad you like it.
I'm going to build a tree house for my daughter and this video was invaluable, I presume the roof framers bible uses imperial measurements? Thanks for the video.
I'm glad you liked it. Yes, it is imperial measurements in the book. Thanks for watching!
Great video , I would’ve loved to see how you sheet the octagon tho , thanks for the video
I was worried the video was getting too long and didn't want to bore everyone. Thanks for watching!
Very well explained, im learning a lot from this master carpenter. I will have to get hold of those two books. I noticed that your bible comes in hardcopy and soft copy. Whats the difference between the two and which one do you recommend? Thank you again
They are basically the same book. The only difference is the hardback has a Spanish translation in the back of the book. The paperback is English only. Most people buy the hardback because of it's durability. It is made tough to be carried in a nail bag. It has a vellum cover and a stitched binding that holds up great. Thanks for watching!
Tried purchasing it on Amazon but they won't deliver to my country (Ireland).
Is there any other way I could get a hard copy? Cheers
Impressive
Thanks for watching!
I guess I would have to go to an engineer to see what he would say about this… I am interested in building a gazebo type building with 7 foot sides. An octagon with 7 foot sides. That’s a little bit over 200 ft.² of floor space. my question is: how much tension ring do I need to build into the structure to keep the 2 x 6 rafters solidly in place. There will also be a octagonal compression ring in the center, which will form a octagonal skylight. Approximately 1 foot on a side. Is this something that your book can compute or do I need to speak with an engineer?
No, the book addresses rafter lengths, etc., not load capacities. Of course the capacity of the tension tie would depend on the total load imposed, both dead load and live load. The dead load is the weight of the materials used. Of course this can vary greatly depending on the type of roofing material that you select. The live loads would also include wind loads, which of course vary greatly by location. It is an engineering calculation, however for a small structure like yours it generally is readily attained. Thanks for watching!
You got my attention elder tradesman
Thanks for watching!
I love your video ..but it is too much information for my old brain. I have a question and I hope you can help me ... I am making a little lighthouse lamp and the roof is an octagon --I know it is a mini roof --I would appreciate it if you could give me some advice I tried with 22.5 degrees and it won't work --I tried with 11.5 it seems to work better .but when I tried to make it hang a little bit it only got higher pointy. I tried fewer centimeters it got less pointy but nothing hung outside. I made each panel 12 centimeters from the center up and a base of 6 centimeters( 8 panels)/ the other panels are 10 centimeters x 6 centimeters 8 pieces. I want each panel to hang 3 centimeters and not be so pointy... I really hope you can give me some advice ...what I need is the roof 9 centimeters high with 3 centimeters hanging .....
Thanks for watching. I'm not able to help you with this project. You are the second person to contact me about a lighthouse lamp. I can't tell exactly what you are trying to accomplish as far as pitch is concerned. You want to use the factor of 0.828 to get the length of side from the common rafter run (horizontal length from center of side to center of octagon). You then need to determine how much slope or pitch you want for the rafters. As far as the angles, all octagon regardless of size will have 45 degree corners and the "working angle" will be 22 1/2 degrees. This is on the horizontal at the base of the octagon. It does not reference the angle of the side of each "panel" or facet of the roof surface. It is all just geometry. Once you determine the pitch of the roof then you can get all the other length and angles. Good luck.
@@RoofFramersBible thanks
I left the one book on the job and went to another build to install doors and do some inside work on account of rain. 2 is one and 1 is none. Just ordered another. One in the truck and one at home. I'll try and dry it out, we will see.
I've seen a lot of them get rained on. They swell up, but the pages stay together and are still functional. Thanks for watching!
How did you calculate hip drop?
Actually I didn't calculate it. I just placed the hip into position and noted how high the shoulder of the hip was sticking up above the common rafter. I then dropped the hip by that amount. Which brings up a good point. There is a time to quit calculating. Sometimes a practical approach is better. Now if it is an issue that you are going to do often, then it is probably worth the head scratching to figure it mathematically. Otherwise I recommend to take the easy approach. Thanks for watching!
Curious on how you calculated the drop. My understanding is the formula is pitch x 1/2 the thickness of the material / the hip run. So for example 2 x material on an 8 pitch would 8x.75/16.97 ..353565 which rounds to 3/8 of an inch. So using that for this scenario I put 14 x .75 / 12.875 (unit run of octagon hip) = .815534 which rounds to 13/16” drop. The difference is stark from the 3/8 mentioned in the video and was hoping you could explain why maybe that formula doesn’t work there?
I didn't actually calculate it. I just set the hip in place and marked where it intersected the side of the common. I presume the reason your formula doesn't work is because it was designed for a 45 degree hip. The angle of the hip on an octagon roof is 22 1/12 degrees from the common and therefore the formula is not applicable. Thanks for watching!
The closest I could get mathematically is by using the formula on page 69 of A Roof Cutters Secrets. It comes out 1/32 over 3/8
We are framers not machinists
@@randallmouser5609 will check it out thanks for the comment
🙏
Thanks for watching!
very interesting video , clearly explained....now i have a question and i hope you can give me some advice...i am doing a little project ( a lighthouse lamp) ,and i need to make an octagon roof ,so far i fail getting it right ( lets say the runners are 12 centimeters in length,i had the whole lighthouse finished but the roof ,or it is to flat or it is to pointy jijijiji 🤣....there are no runners obviously,it section is 12 centimeters in leng x 2 centimeters thick. they are 8 triangle.
Thanks for watching. I'm not able to help on that project. I'm unsure of your specific question. It sounds like you haven't decided how steep you want the roof pitch. Even though you are in metric, the relationships are the same. Just evaluate it piece by piece and I believe you can figure it out. Good luck!
You didn’t get into anything about the deductions needed at the top.
I presume you are talking about the deductions from the common rafter run. In the example we used a "ridge pin" octagon at the center. Doing this required a deduction from the common rafter run and therefore changed the common rafter length. If you look at points 9:42 and 11:20 in the video you will see where we explain that deduction. Thanks for watching!
you are the man
Thanks for watching!