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Easy Method For Calculating Rafter Lengths In Gambrel Roof
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- Опубликовано: 25 июн 2019
- www.homebuildin... Click on this link if you're looking for more helpful videos about roof framing, house remodeling and building repairs. This video will provide you with one of the easiest and simplest methods I could ever imagine for figuring out how to design a Gambrel roof by dividing the width into five sections and then dividing the center section in half to create intersecting points necessary to come up with the lengths of the roof rafters.
非常感谢。
我最近在玩 floor plan，
你的视频，教了我最清楚+简单的方法。
I am putting a gambrel roof on a small chicken coop. This is a great help. I may have to put everything in inches though. 😂.
Ok, I got the length size, now how do I know at what angle to cut them?
They’re all 22.5 degrees
Great info for the person building the traditional gambrel but I want a little steeper sides and a little less top height, I would have liked to see you discuss options to the "traditional".
How do you calculate it in a way that includes overhag at the eaves?
I will add that I do it differently. I take a 12/12 from Wall to midpoint/ridgeline. Or 7 or 8/12 I can remember for shorter barn. 12 gives 14ft high, the other 12ft. But I take half that length and draw a perpendicular line and if I want a top part to say be a 5/12, I go from Wall to mid line then to peak to give me four pieces the same length and same angle being 67.4 for a 5/12. This works with any top pitch if you base your height on a 45 and draw out a triangle from Wall to peak being the base. If you need a shorter barn with same width then I use same method but the 4 pieces are same length but there are two different angles instead of both ends being the same. So with a 45 or 12/12 from Wall to peak, if you want it to be a 4/12 for top part then all angles should be 71.6 and length the same.
very informative video. Just what I was looking for however, with a 12 x16 shed 4' 3 15/16 give me a 6 foot peek height? What are the angles of the roof pieces. Thank you very much
Very helpful thank you!!
You're welcome!
Your video are really informative, glad I found them.
I do have a question and was hoping you could help.
Do the roof angles need to stay the same? Meaning, say if we wanted the interior sidewall taller. That in turn would make top roof angle flatter and the side angle steeper pitch.
Does that have any detrimental effect on structure strength?
Much thanks
I think you can change the angles, but you might need to design the roof different and I don't have any videos on that. Email me a design and I will take a look.
One issue of note would be the slope of the top roof. You would need to keep that at least 3/12 or more or the roof might leak.
This is cool, I plan on building a small barn in my back yard, It is going to be 14 feet wide and 20 foot long, I want a loft 50 inches to the top with the rafters to sit on top plate, built out from 2 x4. Can you help out on that truss.. Big thanks
No, that would fall into the category of structural engineering.
Greg, great video. I'm a first time shed builder and this made it so easy to understand. I saw another commenter ask about the angles being 67.5 degrees. Is that the same angle for your 12'W x 8'H example?
The bottom or lower roof is 56.3 degrees and the upper is 33.7 degrees.
So if I want a 12 inch overhang use 2x6 material and make a seat cut with a 3 1/2in ripped tail and figure the span 7 inches longer? Probably more like 7 1/2 because of the pitch.
Great video. I am curious how you would add a roof for a wrap around porch ? Thanks
I don't have any videos on that, but will put your suggestion on my list.
Thanks
That was awesome 👏🏻.
Thank you! 😁
If the angles are the same when you flip them 90°, or rather the triangles are the same just rotated, then it has to be a 30°/60° triangle. And I was taught that although a very popular and easy "gambrel" style, it is not a true gambrel. Still love your channel and vids. Thank you for your works.
These are for big projects and don't explain pitch angles.
I'm trying to design one for a 8'6" wide tiny house and I can't tell if this works for something that small, especially since there's a height limit
It should work.
So, regardless the size of the building, as long as you use this formula, the cut angles will always be the same, I think? And so what are those angles.? Thanks & Cheers! Chris.
I've never built a gamble roof, but believe that you would be correct in every angle being the same, because of the ratios used. If I have time, I will figure them out and let you know and very good observation.
gregvancom Thanks Greg. Good stuff.
Any recommendations for a 10’ wide shed with an 8’ wall only want to a peak at 12’ max. Love what you do.
Glad you like videos and the same formula should work for any sized building. Let me know if something doesn't make sense.
gregvancom are all the angles 67.5 degrees?
every time i work the math on 10 foot 9 inch and 13/16 length rafter my answer comes out 10 feet 13/16 inches where do you get the 9 inches from love your videos thanks i look forward to your answer i know i am wrong some where
when i do the math i get 10 feet 13/16 where you get the 9 inches from
I was looking in a magazine once and there was a gambrel roof that had the outside sections slightly curved and the effect was quite beautiful. The roof was shingled. Can you show how that might be done and how the eves might be implemented? I have not been able to find that picture again but the memory of it stuck. I am building in northern Idaho.
I would be glad to add your video suggestion to our list of videos to be made in the future.
How do you know what angle the rafter lengths should be cut for the gambrel roof?
I think I have construction math videos at our website that might help. If not, let me know.
Greg, any thoughts on using the metric system for drawings, plans and construction?
If you're asking for videos using metric system, I might make some in the future, but keep in mind the same principles and math formulas should work with both measuring systems.
Could you add a ceiling holding onto the studs of the celing across if its only 9 feet across?
I can't picture in my mind what you're referring to exactly, but imagine that it can be done. Feel free to email me some pictures of your project for more information and you can get our email address at the website.
How do you figure what width lumber to use for your trusses?
You would need to contact an engineer or learn more about engineering. I don't have that information.
How would you do a barn style roof AKA gambrel roof on a play house where the span is only 5 feet?
The same method should work just fine. If it doesn't make sense, then provide me with a little more details and let me know what you're having a problem with.
@@gregvancom fishermichael542@gmail my email ill pervade prints i have
So what if I need the upper section to be taller for the possibility of having a second floor?
Then you could either raise the exterior walls supporting the roof or simply redesign the roof so that it resembles a gambrel, but also fits your needs. Let me know if this didn't answer your question.
What is the 10' mark on the side?
It represents the height of the wall which is 10 foot tall. The wall height can be shortened or increased, depending upon the project.
I'm sorry. I don't understand how you got the 10' 9 13/16 measurement
See if this helps ruclips.net/video/NiYAxQGRCTo/видео.html
Hi Buddy
What's going on Mr. Mac?
I had to remove your political based comment.
@@gregvancom Why do you want to hide the truth, but you must do as you see fit.
@@MrMac5150 I hope you understand, but I try my best to keep all other comments that are not related to home building or repairs off of my channels.
@@gregvancom I understand completely.
How do we do rafter tails with a gambrel roof?
The roof would need to be designed little different and even though I don't have a video on that right now, will put it on my list of videos to be made in the future.
I’m figuring one now, did you use 2x6 material, make a seat cut with a rip down rafter tail 3 1/2, then measure your span bout 7 inches more. Is that bout rite?
You don't explain why you come up 6' (at the 1:21 timestamp).
Is it 6ft universally or are you dividing the 18' span by 3? You never explain it so anyone not building with your same measurements isn't going to know.
It's in the video, watch it again and look for me pointing to the 30 foot width divided into 5 sections or 5 - six foot sections. Let me know if you still don't understand.