How To Calculate The Ridge Height And Rafter Span On A Gable Roof With Two Different Pitches
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- Опубліковано 22 сер 2024
- www.homebuildi... Visit our website today to learn more about roof framing, house construction and home remodeling. This video will help you figure out the ridge location for a gable roof with two different angles on each side or two different roof pitches. It will provide you with the height and span location also which are the numbers needed to calculate the roof rafter lengths.
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Hah! I watched a lady give a basic trig class on YT last summer, and it was interesting how it all made so much more sense now. Fast forward to me trying to use trig to get my ridge height last week, and couldn't quite get it too work. Well, only tried it on and off for 5-10 min.... But this video works perfectly, and it takes a bit of thought as to why it works, because the inital rise/run is already based on inches, so the multiplacation and division by a divisor of 12 works. So, even though I now see how to use trig to solve, this is looks easier and almost faster.
Still doesn't work because he's not taking the height above plate into consideration. Try building this and then what are you going to attach your gutters to? Buildings are mathematically perfect, but then again, it's the rare mathematician who can build a perfect building.
took a drafting class once assignment was to identify roof pitch on 10 buildings in different towns without tape measure or calculator. i used a polaroid camera photos of gable ends then back to the drafting table with t square & diagonals found degree of pitch
I'm sure you know this, but you can also build with those same mixed pitches and have your ridge board in the center of the building. To get that, the wall on the lower slope side will be built higher than the wall on the higher slope side. The difference in the wall heights will be the difference in the total rise for each pitch.
so how do you add length for the eaves
I’m not a fan of asymmetrical roof designs. I have to admit I’m ocd regarding classical architecture. Nice video.
What is the best way to frame something like this?
How does this, or does this effect the rafter extension to allow for overhang?
It would depend on the design, for example shorter rafters might not allow for longer overhangs.
This is the question that people should be asking about this video and the answer is that he's not taking into account the height above plate dimension at all. His rafters are coming down mathematically perfect to the edge of the top plate as if houses were perfect triangles. Nope. You will have a height above plate which will demand a higher ridge. With a higher ridge beam now the seat cut of your birds mouth makes your perfect triangle and... although the surface of your roof will follow your desired pitch (9/12-5/12 or whatever) it is not the actual line C = the square root of A²+B².
Literally hundreds of videos here on UA-cam and no one is getting this right (that I've found.) One guy talks about it, but even he says that you determine what your height above plate thickness is on your rafter to find your ridge height... dude, news flash... rafters come after ridge boards or beams. This is like saying we determine what our first floor stud length will be by measuring down from our second floor.
Do you have a video on caul roofs
I'm interested in the differences in load on each side of the ridge board. which means, can you use a ridge board here or do you need a ridge beam? you could have a massive snow load on the flatter pitch side - what does that mean?
Good question and you can use ridge board or ridge beam if you need more structural strength. The load transfer from snow might need to go down through walls, purlins or beams that support rafters and transfer all the way to the foundation. The ridge won't always be transferring all of the load.
Nope. You're not taking into consideration height over plate. You're building is too short and your rafters aren't going to work unless you have absolutely no birds mouth, no over hang, and no soffit. Looks great as a computer model until you try to build it out of wood and you want something like gutters around your building
Yeap. Show me one thing by using a time stamp in the video that is incorrect. If it looks great in my model, it usually works perfectly.
I'm a born and bred American and maybe I'm a minority on this, hell maybe even a stereotype millennial by now, but I weep for our forefather's not having adopted the metric system way back when.
Was it just for being made by the French? I don't remember what reason I heard as a kid, or if it was actually French made. Whatever the cause, I think now we can swallow our pride and implement it. Especially since pride is no longer the reason we dont. If it is then why was our monetary system decimal based?
Seriously though, why should we continue to use imperial to measure everything literally not dollars nor cents? Other than the conversion costs. Which is more like an inherited debt, a penance, passed down with each generation not willing to learn.
Btw, if you even want to say it's because of tradition, then please do a traditional facepalm and evaluate your personal life-perspective.
As for conversion costs, there are literally NASA missions, AKA multiple-millions of dollars, that have blown up because we still won't learn it. That's more than enough to prove why we should convert.
Amen! We need to go metric.