How To Calculate And Layout Hip And Valley Roof Rafters Using Math Formula And Framing Square

www.homebuildi... Visit our website today to learn more about roof framing, new house construction and home repairs. Here's another helpful video that will show do it yourselfer's how to calculate and layout a hip or valley roof rafter. It will include the math formula and framing square measurements for marking and cutting the roof framing components. Keep in mind that larger pieces of lumber might be required and you will need to adjust your calculations for roof pitch ratios and angles to match your building projects.
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[@lisalaughter1416]

I seriously thank God for you....I want to learn how to build things properly but do not always neccesarily have the needed mentality for complicated explanations....although sometimes I wish I was sharper in that regard....you are a blessing to me and Im sure many other people....you are truly a roof whisperer.....or a roof massage therapist or something akin to that....thanks, Lisa

[@gregvancom]

You are so welcome

[@gregvancom]

I solved my problem with a little help from a viewer. Instead of 17 inches use 16.97 to make the math formula more accurate.

[@glaistermuschett9693]

P0

[@OSAS726]

That is absolutely correct. The Pythagorean theorem at work. The square root of 144+144 or the square root of 288 = 16.97056274847714

[@fouadboutiche69]

Where the 5 and 17 came from

[@Viral_MediaClips]

Awesome video glad I found this, learned a ton about laying out and calculating hip and valley rafters. I already understood how to calculate and layout common rafters using Pythagorean theorem but was curious how hip and valley’s worked and this video provided all the information I needed. Your explanations were great and easy to understand, from what I got from the video this is very similar to the common rafter except for your 12in in the common rafter formula you would sub it for 17 inches and subtract for half the distance of the width of the peaks of the common rafters. I will be subscribing keep up the great work👍

[@gregvancom]

Awesome and thanks for letting me know.

[@rednissan96]

Just wow. So simple the way you explain it. I have done construction for over 30 yrs. and this method is great. Many people will benefit from this video.

[@gregvancom]

Great to hear and it sound like most viewers have given it a good thumbs up!

[@Outrunninaround.]

A 1.5” wide board is bisected at a 45 angle, that chord measures 2 1/8”. Half of that is 1 1/16. So that should equal the measurement adjusted from the tip of double 45 bevel to the theoretical center on ridge board.

[@wabznazam]

Great video of you live in America. Imperial measurements just muddles things. Degrees and millimetres are better suited to mathematical calculations.

[@jack460able]

Good videos just a side note when cutting the hip overhang to match the rafter thickness it has to be measured on the hip plumb cut line and not square to the board cheers buddy

[@hughlancaster7187]

I have watched many videos on building a hip roof . I am redoing a hip built years ago adding a wrap around porch. It was built out of real 2 by 4s. I tried using the calculator and use the framing square to make my cuts. I am adding a wrap around porch using 2 by 6 and my run 70 1/2 inches. My height about plate for my rafters is 5 inches on 2 by six to match the design of the old build. If my king rafter height above plate is 5' and my HIP rafter height above plate is 5, it should be level. To check if level, I took a straight 2 by 6 place on top of the rafters in line with the plate all the way to the hip; It is showing the hip is about 3/4 inch to low. My plate is level all the rafters up to the king rafter are level.

[@gregvancom]

It will be difficult to answer your question, with out being on the job site. It does not make sense, if you have 5 inches on both hip and common rafters, unless you measured from the wrong spot. I would simply re cut hip or add shim under to raise hip.

[@kicha_tm9020]

Hypotenuse of 10x10 square equals to 169.705. Just calculate 120√(2). √(50^2+(120√(2))^2) is 176.91. The reason is 5/12 does not translate to 5/17 exactly, it's just very close approximation.

[@gregvancom]

You're a life saver. All I need was a little kick in the pants. I've took it for granted that 17 inches was the hypotenuse when it is 16.97 and if I multiply .03 ( the difference, then I can find my .3 or 3/8 inch almost difference. Thank you for solving my mystery.

[@mariekiraly100]

Jesus Jones who still uses math? lol - great video!

[@OSAS726]

@@mariekiraly100 I do. Lol.. I’m an electronics engineer and mathematician. I have written many mathematical proofs for the Pythagorean theorem in my career. Currently I tutor algebra and calculus to college students. I can solves many of the mathematical problems in construction or other related trades and fields quicker with calculus by the use of a derivative or an integral than I can with algebra. That’s simply because of the time consuming rigors of algebraic calculations. I can find the area of various sections of a triangle by the use of an anti-derivative faster than somebody using algebra to find the same areas.

[@mariekiraly100]

@@OSAS726 I was just kidding. I had a hard time w math in high school because I was/am ADHD, unfortunately. I actually did well in Calculus 1 in college, but could NOT understand Calc 2. That was because I just didn't understand/memorize the basics from High School. That's ok - I'm always thankful for people like you!

[@joshuadenney8436]

What cad are you using and is there a free one that I can use

[@stevegoulding1613]

Clear as mud. I’m sure if you did that same calculation in decimals it would be easier to understand and that imperfectional gap wouldn’t be there? Come on America, get with the times and go decimal. Steve from Australia.

[@joshuaiverson9125]

I mentioned 2in buy 3 and 3/4 to 2 and 7/8s

[@StevenWernerCS]

What is the best way to nail the 8 rafters together at the peek?

[@gregvancom]

I use 16 d nails and fasten the components together in a way to were they can be nailed. For example, the common rafters fist, then the hips or the hips, then common rafters.

[@tillmansr2002]

Great video again. At 11:03 you have the measurement 1-13/16. Is this number calculated or 'measured in the field'? Because without that number, none of the subsequent math can occur. confused..

[@gregvancom]

Measure in the software I'm using and it's pretty accurate.

[@TheJudgeJuryExecutioner]

My home is a 29 x 29 colonial and the roof is framed exactly like in this video.

[@gregvancom]

Yes this is a common form of home building.

[@Brandon-no3vc]

what dementions does the house have 2 be to have no ridge?

[@jessedevlin9489]

equal sides and width

[@Tina-h8r]

Actual dimension of a 2 x 8 is 7-1/4" not 7-1/2"

[@babuvengat5790]

Good

[@robertoinvests]

very good

[@gregvancom]

Thank you! Cheers!

[@adrcamacho1]

So hip rafters are always 45 degrees to the hip?

[@gregvancom]

For the most part yes, but can be used with different angles.

[@Brandon-no3vc]

How do you get the hip length without a calculator?

[@gregvancom]

I put your suggestion on my list. It's to long to write out and explain.

[@jessedevlin9489]

multiply your rafter run by 1.414 (square root of 2), Then multiply it by your LHPUR (Length of HIP per unit of run) Which is found by solving for the hypotenuse of your roof-rise/16.97 using Pythagoras.

[@bunnylewis6557]

Got any A frame cabin videos?

[@gregvancom]

No I do not, but I will put that on my list of videos to be made in the future. There doesn't seem to be a big demand for this type of construction anymore, but it one time it seemed like everybody was building them.

[@bunnylewis6557]

Would be appreciated. I am planning to build one up here in the NW.

[@jorgevazquez462]

I had watched other videos where they take 3/4 of in inch for the hip drop why is that

[@gregvancom]

If you can provide me with the title of the video I will take a look at it and answer your question.

[@jessedevlin9489]

Im not sure you have to do that if you bevel rip the length of the Hip- Otherwise the corners will sit up high and bend your sheeting material upwards at the hip

[@jeevajeeva8033]

God plan

[@gregvancom]

You're welcum

[@RamenPlease]

Is this a kit?

[@gregvancom]

No, most roof framing components are cut to fit specific projects.

[@joshuaiverson9125]

That might be why your a 1/4inch gap showed up.