Carpenter Math : Roof Pitch & Slope Gain Factor

Carpenter Math : Roof Pitch & Slope Gain Factor - Pt 2

Рет қаралды 43,902

6 жыл бұрын

A few simple Math tricks can greatly improve your carpenter, handyman or DIY skills. I run through how to calculate fascia length on a gable end house. After that we dive a bit deeper and I show you some old school rafter framing and the fundamentals you need to know!
Do I dare say Pythagoras Theorem?! These are fundamentals that I use everyday and understanding how and where to use the math is highly valuable.
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I'm Kody Horvey, owner of Up To Kode; a full service carpentry, contracting and consulting company that proudly serves Red Deer and all of Central Alberta.
We are committed to being Central Alberta’s most sustainable and energy efficient builder with a strong focus on quality and innovation.
Our vision is to continually implement and increase the use of high efficient building practices and products to create sustainable, multi generation structures.
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Пікірлер: 54

@donniehowattzer2759 2 жыл бұрын

Thank you for this! For me this a fun math problem to do for fun. Nice pass time 😉

@uptokode 2 жыл бұрын

😉

@JoseSanchez-xd1oz 2 жыл бұрын

Thanks Kody Horvey it's nice the way you teach.

@uptokode 2 жыл бұрын

You’re welcome! And I appreciate the comment.

@Unaomnia01 3 жыл бұрын

This is awesome!

@stevesargy1771 5 жыл бұрын

Inspired me

@eboyelec8138 4 жыл бұрын

Thanks

@kevingarcia-tc9kg 5 жыл бұрын

How do I get the top plate for take wall

@bradevans7107 4 жыл бұрын

Pretty handy. One of the corky things that bothers me is when using the common "rise /run" system is WHY they (whoever was behind its use) decided to exceed a 45 degree pitch by simply increasing the rise after 12/12. If I was the behind the way "rise / run" was used I would have increased the pitch after 45 degrees by holding the rise at 12 and reducing the run back. (12/11, 12/10, 12/9 etc.) Not only would it give you horizontal to vertical in 26 increments (0/12 - 12/0) But the difference in degrees from 12/12 & horizontal/ vertical would be an exact match both ways...you could memorize it. IDK. just a thought. *Technically there's too many increments involved in the current system....(not that its nessesary) bit a true 90 would take beyond a 12,000,000 /12 pitch.

@jimmyreid6516 4 жыл бұрын

And you don't have to waste time on the math time is money

@jimmyreid6516 4 жыл бұрын

Your framing square is your best friend run multiple by rise gives you the total rise,every pitch has a formula so know the formula per rise whether it be from 3 to 12 and just take the run and multiple it with the rise time run formula example the 5:12 formula is about 13 point something inches so if the run is 10 feet just multiple it with the 13 something inches and that would be your total length plus the additional length for the over hang at your preference

@photojournalist1194 3 жыл бұрын

Great job Kody. In fact exactly what I needed, the only thing I missed somehow. Where do you get the 1" for the slope gain factor for the top of the rafter? If the beam is 2x10 where the one inch is come from can you explain that please? thank you.

@ellynkwama8603 5 жыл бұрын

Noted

@extremekicklee6269 5 жыл бұрын

good job

@j3ff840 Жыл бұрын

Where did the 22 come into play

@uptokode Жыл бұрын

I would have to watch that part again. What time was it at?

@clay100 4 жыл бұрын

I comprehend the first part. Didnt quite get the last part tho

@thestruggleisreal581 5 жыл бұрын

Very helpful buddy

@uptokode 5 жыл бұрын

Glad it helps!

@vincentcastro5013 4 жыл бұрын

How would I get a slope from using two known heights?

@uptokode 4 жыл бұрын

You need your horizontal dimension (aka your RUN). You already have your Rise or height. Then just convert that into a ratio of x:12. X is rise over a run of 12. Does that help?

@markleeks1116 Жыл бұрын

36.869° is the pitch

@uptokode Жыл бұрын

🤙

@mikewinter87 2 жыл бұрын

I really appreciate the video, but I would certainly revisit this one. There is a much easier way of explaining Pythagorean Theorem and how it applies to our speed squares and our framing squares. I completely understand the math and the formulas used. The math you have is correct. But if you explain that you have a 9/12 pitch on a 22’-0” run of a house. Just do a2 + b2 = c2 on the slope given. 9^2 + 12^2 = c^2 81 + 144 = 225” (which is c^2 - 15x15 = 225) Now take 15 (c2) x 22 (your total run) and you get 330” which converts to 27’-6”. I would use a framing square and also I would break down the math, step by step. Explaining why you use a radical to remove a squared object. For example. 9 squared. If you just put 9 in a calculator and use the radical (the squiggly line with an x underneath it) you’ll get 81 because 9 squared is 9x9.

@uptokode 2 жыл бұрын

I appreciate your input! I’ll have to watch this again. Sometimes for the viewers I start at the beginning and just teach 1 Concept. Then I advance from there. If one doesn’t understand WHY or how to do it, they won’t understand how to speed it up. I’m talking the real beginners.

@mikewinter87 2 жыл бұрын

@@uptokode for sure! And like I said, don’t get me wrong. I definitely appreciate what you’re doing. Because it takes real courage to share these concepts online, by putting yourself out there and let the world see and criticize or praise your work. I guess I’m doing both lol but like I said, I’m glad you’re doing it because someone out there is going to benefit from it. Thus, making the world a better place. So keep on keeping on. Thank you for starting your channel and sharing carpentry with the world.

@uptokode 2 жыл бұрын

You betcha Mike! I appreciate the support.

@nm3547 Жыл бұрын

@@uptokode I really appreciate the effort put into this. Newly trying to understand, so I'm a beginner here appreciating your work. I used to love math and was always very good at it, til I stopped using it. Your video helps me recognize I may need to sit down to remember the division of work, but it helps me get started in how yo utilize the concepts and formula. Thanks Kody!!!

@chevy1986 4 жыл бұрын

198" is 16'-6" getch a little more accurate.

@balloney2175 5 жыл бұрын

Hey Kody, Are you a carpenter or a teacher? Just asking.

@uptokode 5 жыл бұрын

I’m a carpenter.

@kevingarcia-tc9kg 5 жыл бұрын

How do I do the math for a top plate rakewall

@kevingarcia-tc9kg 5 жыл бұрын

I got it bro thanks

@uptokode 5 жыл бұрын

Ok cool. You can use Pythagorean’s theory or use a slope gain factor multiplied by the horizontal run dimension.

@adv.nileshnikole6379 3 жыл бұрын

I have 28 ft horizontal house...what should be ration?

@uptokode 3 жыл бұрын

Not sure if I understand the question. Need more info.

@adv.nileshnikole6379 3 жыл бұрын

@@uptokode sir..i have 26ft horizontal. and 28ft vertical house then what should be slope ratio...is 4:12 a good slope for 1 st floor metal roofing?

@uptokode 3 жыл бұрын

4:12 is a very common pitch. Works great for all applications. Low and safe to work on. Works great for metal. The only reason to go steeper is cosmetic and sometimes to protect against weather or snow build up.

@adv.nileshnikole6379 3 жыл бұрын

@@uptokode thank u sir

@cgstrek2861 2 жыл бұрын

I'm planning to build a pavilion this summer, to hangout and use as a carport during Winter. 12' by 16' outside posts dimensions with 6" overhang on all sides. What is the perfect slope? Thanks

@TsiRoadkill 6 жыл бұрын

Construction master calc

@uptokode 6 жыл бұрын

Yes they are extremely handy. I’m just trying to show the basics so people understand HOW the math works and WHERE to use it. Then the calculator can help them after they know the fundamentals.

@AliBinSun 5 жыл бұрын

@@uptokode They don't make em like you anymore. Kody keep it up man. Not to many Carpenters have brains anymore.

@chevy1986 4 жыл бұрын

@@AliBinSun agreed

@forwardhomeenhancements2622 3 жыл бұрын

Hey man, I appreciate what you're doing, but I think that you just made figuring a plywood take off a lot more complicated than it needs to be. How about rake times Eve equals total square footage needed for the plywood per side(for an up and over). Add in your waste factor and I think you'd be all right 🤷. I don't know about, a squared, times b squared equals c squaref for plywood take off, or shingles for that matter. Calculating rafter length while building absolutely. Also if you already have the buildings run, chances are you either have a set of plans, an eagle view, or have been to the site right? And that regard them what are you doing unnecessary math for? Not trying to bust your balls I'm just saying.

@MikeSmith-li8fs 4 жыл бұрын

Does he look like a younger El Chapo?

@uptokode 4 жыл бұрын

Not the first time I’ve seen that. Haha.

@jimmyreid6516 4 жыл бұрын

Dude all that maths is a waste of precious time,you come on my job with that and you are gone there are fast and easy ways to figuring a pitch roof with out all the brain busting diyrs must be on here scratching their heads