How to Calculate the Height of a Ridge Board

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This is part 2 of our rafter basics training. Today we're doing a little review, adding some new ideas and concepts, and learning something completely new, which is how to calculate the height of a ridge board. If you have questions or need help, be sure to leave a comment below.
RAFTER BASICS PART 1: • Beginner Rafter Layout...
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My name is Josh Fedorka, and I’m the founder of Training Hands Academy™. I have been a carpenter and woodworker for over 25 years. I have also held certifications in home energy auditing and have built several LEED certified homes in New England.
God has gifted me with many “hands on” skills and it is my calling and purpose to share those skills by teaching others. Whether it is to seek a career in carpentry, become a general contractor or improve one’s DIY skills and knowledge, the motivation behind THA is to help others successfully learn how to work with their hands.
#Calculate #ridgeboard #rafters

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31 май 2024

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Комментарии : 248

@samuelmandarelli2645 Год назад

I’ve been an owner of a structural framing company in Florida for 30 years. You Sir, would be an awesome carpentry instructor. Your delivery is extremely simple and you take the time to go around the back to show and explain what you are teaching so visual learners can grasp these concepts easily as well. I’m sure that you will make a lot more money working in the trades… but I believe you would be much more greatly appreciated and rewarded in a vocational training center teaching young men and women a trade that is quickly slipping away. You have a gift… and I’m not one to give complements easily.

@TrainingHandsAcademy Год назад

I really appreciate the complement Samuel. God bless you.

@byronjenvey2101 3 месяца назад

37 year carpenter here...great presentation ! In the field we do simplify some of these steps but your theory is nicely explained. Roof pitch is actually the ratio or fraction of the total roof span to the total height of the roof from the top of the top plate. Roof slope is the angle measured with 12" as the horizontal and the vertical rise given in inches. 6/12 slope is 6" rise or vertical for every 12" run or horizontal. A roof with a 24' span and 8' height to the peak would have a 1/3 pitch.

@passingmongoose Год назад

Very well done. I appreciate your annotations and demonstrating the math.

@erikroman3447 3 года назад

Wow thanks alot on all of your videos that are perfectly explained and demonstrated.its educating me on alot of details that I didn’t know and can now better understand thanks to you! Thanks and keep it up for all of us wanting to learn more🙌

@sooshrholes647 11 месяцев назад

Your explanation is so good, great teacher! Thank you!

@carsonfreckleton7719 2 года назад

Soooo clear and concise! Straight to the point and makes so much sense now. Thank you!!

@TrainingHandsAcademy 2 года назад

Great to hear! Thanks for letting me know.

@joshuaberkoff9936 4 месяца назад

I have recently needed a refresher in rafter and stair layout .I have been wood framing for years and since stepping away from layout a few years ago needed exactly what you reviewed and showed on your training videos.They were very informative and right on procedure taught straight forward and was very impressed.

@TrainingHandsAcademy 4 месяца назад

Thanks for the comment Joshua.

@josephpuchel6497 3 года назад

Hey I’m glad I came across your tutorials. Best explanation. I built my shed and now I’m going bigger and build a garage.

@TrainingHandsAcademy 3 года назад

Hey Joseph! Thanks for the comment!

@ShamsAzeem 4 года назад

Thank you for working so hard on making these videos. I hope you get appreciated enough for this. The amount of time you take on creating your content like labelling every part, breaking down the content itself is phenomenal.

@TrainingHandsAcademy 4 года назад

Thank you Shams for the kind words! Your comment was timely... thank you for the encouragement!

@vinic8687 4 года назад

Very interesting seeing this being taught again! When I did my apprenticeship we were told that the birdsmouth / measuring line should always be 1/3 of the depth of the rafter. Also, as the ridge board does not take any weight it was okay to use 1 1/2" timber - no need to use 2" or thicker timber. One other thing that we were taught was to allow for say 1/2" of the ridge board to project above the rafters as the straightness of the ridge could never be guaranteed - the end rafters could be fixed and then the intermediate rafters fixed using a string line to provide a level finish. The quality of the timber might have improved since then though!!

@TrainingHandsAcademy 4 года назад

Fave, thank you SO MUCH for sharing your knowledge with us, it's all still relevant and very useful! Cheers!

@vinic8687 4 года назад

@@TrainingHandsAcademy Not sure if you have ever heard of it but there is a book called the Roofing Ready Reckoner by Ralph Goss - very helpful!

@TrainingHandsAcademy 4 года назад

I have not, thanks for recommending it!

@tystallard Год назад

Thanks for the update, I was actually building a green house and I used one of your other videos and started making a cut into a 2X6, it seemed off because I did not have the exact ridge height where I had my two ridge support jigs at the right height. This updated video helped me out quite a bit. Thank you.

@TrainingHandsAcademy Год назад

Thanks for watching!

@strokerace4765 3 года назад

Thanks for the video, I used this information for a ramp for my mom’s wheelchair

@martinlandscaping4696 Год назад

Great tutorial. I am building a 16x16 storage shed with a 5/12 a-framed roof and could not seem to figure out the ridge height. With your help I have it all figured out and will soon be setting rafters!

@TrainingHandsAcademy Год назад

Fantastic!

@JeffSwal 3 года назад

That was AWESOME. Best explanation on this EVAR!!! Thanks

@TrainingHandsAcademy 3 года назад

Glad it was helpful Jeff!

@jayeshnair877 3 года назад

Video Simply resembling a teacher who is too late to cover his portions before exam. What a bloody speed. Must see video and pause button is my only friend.

@TrainingHandsAcademy 3 года назад

LOL. Yes, we make fast-paced content here on RU-vid, and slower paced content in our online courses.

@BIKEMAN21 2 года назад

i just built a ridge beam and installed 2 rafters... and i watched this video several times and still dont get this explanation... introducing variables such as F , G ... very confusing

@deniscronin4131 2 года назад

Absolutely brilliant

@deanperry8390 Год назад

hell yeah brother keep teaching👨🏻‍🏫👷🏾‍♂️💪🏾 them visual aids help a lot

@TrainingHandsAcademy Год назад

Thanks Dean!

@shauna6140 2 года назад

When calculating the rise do you measure from wall plate to the top of ridge beam? Thanks

@arcesiobustamantesanchez5963 5 месяцев назад

Eres el mejor, te agradezco por compartir tu conocimiento

@lukestevenson7358 Год назад

Wonderful Tutorial!!!

@TrainingHandsAcademy Год назад

Glad you think so!

@leleiththelwell5478 2 года назад

Thank you ....very helpful

@teddyjones3055 2 года назад

Nice job. Love these videos. I was thinking about the first equation used. Although it may seem obvious to some, I think of the first equation at (D/12)*B. D/12 means that the total run - half the thickness of the ridge board is being converted into foot increments. 23.25/12 = 1.9375 ft, Since the rise is 9 inches per foot we can calculate 1.9375 ft * 9 inches/ft = 17.4375 inches, or 17 and 1/2 inches. From there it's a simple step of adding the HAB to get the actual ridge height.

@TrainingHandsAcademy 2 года назад

I don't know you Ted, but I sure do like how your brain works! You must love math?!

@user-ow7dx8nf5y 8 месяцев назад

So wonderful love it so much

@TrainingHandsAcademy 8 месяцев назад

Much appreciated! If you want to support my work, please drop some more comments on my other videos! This helps to wake up the YT algorithms. :)

@rigobertomurillo5814 Год назад

Excellent video

@TrainingHandsAcademy Год назад

Glad you liked it

@moisesrobles7884 3 года назад

My first time I see your show and like it I'm smashing my like botton yahoooooooooo kaboooooooooooooom

@noelguevara2350 4 года назад

Thanks for the video it is a great video was wondering could you make one of how to make a dormer in a existing roof

@TrainingHandsAcademy 4 года назад

Noted! Thanks for the comment Noel!

@easy-steps-carpentry5745 3 года назад

Another good video! Normally I work in degrees but it's the same principle . Another practical way is to lay a pair of rafters on the ground with a piece of ridge board in place and with the span measurement set in-between the birds mouth cuts then just measure up from a straight distance piece or a string line pulled across if it's a big span. This gives the height to the top of the ridge or the required measurement if cutting a prop to temporarily hold the ridge in place.

@TrainingHandsAcademy 3 года назад

More great info... thanks for sharing your knowledge! 👊

@stephenwatson1873 3 года назад

That’s what exactly the way I was taught at college too

@rawrbowser Год назад

3:49 Thanks man I wanted to build a tool shed. I’m not sure house building yet!

@Sharmanworkout 4 года назад

Hey would you make a video on hip rafter please? Your way if teaching is very good compared to others I've watched. Thanks :)

@TrainingHandsAcademy 4 года назад

Yes I plan on doing one...I just don't know when yet. Thanks for the suggestion! 👊

@genemack4470 3 года назад

Agreed!

@johnf1973 4 года назад

New subscriber to your channel. Very informative videos 👍

@TrainingHandsAcademy 4 года назад

Welcome aboard John, I'm so glad you are here! How can I help?

@ATappin 2 года назад

Would be awesome if you have a video on how to calculate when you want to tie into an existing roof. For example, an A frame patio cover that ties into the roof, 6:12 pitch for both. Some calculations being making sure the gutters line up for both, etc.

@TrainingHandsAcademy 2 года назад

I do need to do one of those.

@truthisnotanopinion71 3 года назад

Could I not just have a random measurement for ridge height ? For instance, I have a 2.4 mtr span from end of wall to end of wall. Could I have a total ridge height of 1mtr or 1.5mtr from top of wall plate and work around that ?

@MrRainmanly 3 года назад

Fantastic videos, thank you! I saw you measured the HAP with the tape measure and then add that measurement to your calculated ridge height for a total ridge height. Is there a way though to calculate out the HAP instead of physically measuring it?

@TrainingHandsAcademy 3 года назад

That's a great question Ranman! I honestly don't know the equation(s) behind that. There are charts available online that do the math for you... they factor in the pitch, material width (2x6, 2x8, etc), and the length of the seat cut to come up with the HAP. Google height above plate calculator to see some of them. Hope that helps!

@MrRainmanly 3 года назад

@@TrainingHandsAcademy Thanks, I went and checked out several calculators online as you suggested. Also, on Google SketchUp I created a 2 x 6 rafter at a 8 12 pitch, 33.9 slope. Then intersected that into my 3.5" + 19/32" top plate without cutting a seat more than 1/3 the width of the rafter. Then I just measured the theoretical HAP. Thanks for your help.

@spencerhall4452 3 года назад

Good video

@faithhuisman5073 3 года назад

So for 10x16 a roof with an 8/12 pitch, would my ridge height be 3.65 ft?

@richardrogers6596 3 месяца назад

Thanks for your methods. I like your channel as the tools are more simple. I watch other youtubers with shops full of 100,000 dollars of equipment maybe more. Useless for me who only can afford simple tools.

@TrainingHandsAcademy 3 месяца назад

Thanks for the support!

@Birtyfurry 4 года назад

greting from chile! english isnt my main language but still always interesting learning how things like that are made. and your way to explain sounds super confidence! . always when i see people framing homes . my big question its how they figure to make the roof right shape ! and those how those who create custom roofs mixting different lenghts haha i was always bad for maths at schools but when things like that interest me. i try my best haha

@TrainingHandsAcademy 4 года назад

Hello Birtyfurry! Thanks for commenting.

@Birtyfurry 4 года назад

@@TrainingHandsAcademy hihi and your welcome! anytime buddy! very nice channel u got there !

@MGLunpluggedTV1 2 года назад

I wanted to know if you could do video on circular double walk in circular stairs and gronin vault ceilings. The main reason is finding out the formula used in the process. I can send a blue print if you want an example to go off of.

@TrainingHandsAcademy 2 года назад

I've never done one of those, so I'm afraid that is above my pay grade. :)

@user-qk7lj8sq2n 10 месяцев назад

Excellent videos thank you. Can you confirm that the 1/3 rule overrides the wall plate length when cutting the birds mouth? Ie I maintain a minimum of 1/3 cut into the rafter, and reduce the length of the the wall plate thickness cut to achieve that.

@TrainingHandsAcademy 10 месяцев назад

Hello, I would up-size your rafter material to maintain the 1/3 rule first before doing anything else.

@user-qk7lj8sq2n 10 месяцев назад

@@TrainingHandsAcademy ok thanks. Great videos.

@harrysidhu9608 3 года назад

.. you are the best

@jb7069 4 года назад

Any future upcoming videos on building trusses? That would be awesome

@TrainingHandsAcademy 4 года назад

Sorry James, not in the near future. Thank you for watching!

@pmaceastoakland645 3 года назад

Its 3 in the morning and i got my phone as a night light and my moms phone to watch the videos. I got my notebook and i cant put the phone down. Besides being informative its easy to grasp the information. Thanks for the video.

@TrainingHandsAcademy 3 года назад

LOL, nice!

@chrissumrall3345 2 года назад

I just want to know when using a framing calculator is the rise it gives you from the top plate to the bottom of ridge?

@hudsonsoul1121 2 года назад

Top

@robertparsons8849 2 года назад

A good video as usual. Could you demonstrate how to do a roof when you have 24" run and total ridge height required 23" if they are the only dimensions you have. In other words you only know your run and required ridge height.

@TrainingHandsAcademy 2 года назад

My other rafters videos will give you great insight into that. The biggest factor is something called height above plate (HAP). Let me know after you watch them if you still have questions.Thanks for the comment Robert. Talk soon.

@naheedramzan2648 3 года назад

For me as a woman building 1st ever greenhouse, Your video was really easy to understand. I'm trying make a 10x6 greenhouse. I was going to use 4x2 for plate and ridge. 3x2 for rafters. The greenhouse frame will sit on a concrete block wall that I built 1.5-2ft in height and the roof will be polycarbonate sheets. I'm not sure if i should use 4x2 for ridge or not?? Any reply would be much appreciated. Thanks

@TrainingHandsAcademy 3 года назад

Hello Naheed, thanks for the comment! Unfortunately, I can't answer that question because I don't know enough about the project or your local building codes. I apologize that I can't help you out more. Sound like an amazingly fun project!!

@naheedramzan2648 2 года назад

@@TrainingHandsAcademy Late reply but i finally did use 4x2 as felt more sturdy because of length of greenhouse. Adjusted length so finished project is 10x11 feet as wanted more space inside to grow vegetables.

@Morning_Rays 2 года назад

Thank you for wonderful video. I have a question please. I am replacing 4x2 rafters with 6x2 rafters. How can I make sure that my ridge height remains the same? This is because height above plate will increase by 2 inches. Do I lower the wall plate by 2 inches? Or do I cut a deeper seat cut? Thank you 🙏

@TrainingHandsAcademy 2 года назад

What type of structure is this? The problem is that you would have very little material left after cutting a deeper seat cut in the 2x6. It's always good and in some case code to keep the 1/3 rule. You can see the 1/3 rule in this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QV7hfQJ15o0.html

@MrGarry128 2 года назад

Thank you for your prompt reply 🙏. I am planning to do a loft conversion in the UK and the property is a semidetached house with gable roof connected with neighbours over the part wall. I guess my best option would be to lower the wall plate by couple of inches to accommodate new rafter height ? And then perhaps I can fix 4x2 blocks in between the rafters above wall plate to bring the floor joists to same level as before ? Thank you for your high quality videos.

@northeastcorals 11 месяцев назад

Wish I hadn't drank that case of beer before trying to watch this

@TrainingHandsAcademy 11 месяцев назад

LOL

@thatscrazy9139 3 года назад

Want to know if it’s better to take 3/4 off run for rafter or take 3/4 off the rafter measurement itself. They both come out slightly different but I want to know which one it really is

@eod9517 Год назад

Actually the measurements are Exactly the same. As long as you take 3/4 of the rafter measuring back from the plumb cut and not down the rafter

@stoneyj1a1 2 года назад

How do I get to the bottom of the ridge board so I can make a support board?

@user-wt7ph7of2w Год назад

16' total run, desired 6 on 12 pitch. If you're not cutting a birds mouth into your roof rafter, wouldn't the top of the ridge beam be 47.62? Great instructional information!

@pascalchimbonda7827 3 года назад

Just wondering how do you determine what way the ridge board will run for example I am building a 10 x 6 shed so should my ridge board run the 10 ft or the 6ft how do I know which way to run the board also if running it the 10ft am I measuring half of that which would be 5ft less half if ridge + any siding to get my height .so this would mean my common rafters are running the 6ft way .if that makes sense

@TrainingHandsAcademy 3 года назад

I'm sorry but I'm only following part of your question. Can you please email. josh@traininghandsacademy.com

@jrquidi2572 3 года назад

Good ..good...👍👍😎

@megakhan2005 5 месяцев назад

Can you make a how too video for a 24 by 24 garage. Total height from top of ridge 12 feet.

@MrMagsimus 3 года назад

Thanks for a great video , you explained really well, being that I’m stupid I still managed to get an idea of what you was saying , if I had a better brain I’d actually be able to make a dog kennel 👍👌 thanks bro

@BIKEMAN21 2 года назад

this is quite complicated. Pythagorean theorem looks easier

@rexolrexol7893 3 года назад

What i do to get ridge height .. say a building is 24 1- 1/2 with a 2x ridge.. so the run is 12' if you have a 6-12 slope multiply 12x6 eq 72 plus height above plate if you have say a run of 12 3 5/16 that again is 72 with the framing square draw a 6-12 slope on a board on the level line slide the square over to 3- 5/16 as you slide it you read the height of the square above the board plus the height above plate.

@jr6281 Год назад

I’m trying to stick frame a shed. Next step is to set the 2x6 ridge beam. To figure that height, and I know my building span(run), and my roof pitch, it seems like I should layout my bird’s mouth first so I know my height above plate. Is this correct? This way I can factor that into the total rise and height I need to set my ridge beam?

@TrainingHandsAcademy Год назад

Correct!

@jeandoojune 2 года назад

Thank you for these 2 vids on rafting. I will never make a real roof in my life ( that i’m aware of now)… but I’m making my son a playhouse out if cardboard and I got stuck at making the roof. So what to do… well I found your vids and now my task will be much easier. I just need to decide what material to use to make the structure work to put on sheets of cardboard and over it then “made belief” shingels. 😅 I know sahm with too much imagination and time well spent with her child.

@saifulnizam8644 4 года назад

Hi ...i wonder what if the rafter is on top the ridge beam? Is it the same method?

@TrainingHandsAcademy 4 года назад

The math would mostly be the same for the rafters... you would just have to figure out the connection at the ridge (notch or hangers).

@jasonharris3557 2 года назад

I have a question about the ridge board. Is it necessary? Can you use gable plates and simply get rid of the ridge board altogether? Thank you

@TrainingHandsAcademy 2 года назад

If you are "stick" framing (which all of my rafter videos show) you need and ridge. However, what you are talking about is building a truss.. which works too but other framing members need to be used to make a truss work.

@nicholash8021 4 года назад

What purpose does the ridge beam provide if it's unsupported at the ends? Why not just use mending plates and rafter ties (and optionally, collar ties), sort of like a truss? This way, you can build a jig and create all your trusses the same. You can also temporarily align them with a 2x4 running across the underside of the rafters until the roof paneling is in place, then remove it. Alternately, you can overlap the rafters at the peak until you get your angles perfect, screw them to each other, then cut away the excess. Nice video, both 1st and 2nd parts btw. Thank You.

@nicholash8021 4 года назад

After thinking about this more, my idea to overlap rafters at the peak wont allow convenient installation of collar or rafter ties unless you are ok with using mending plates at one end and overlapping and using screws at the other. Also trusses have issues when you need to add functional dormers (not cosmetic dormers that just sit on top of the roof). In that case a rafter board can distribute the load to other rafters whereas compromising a truss to install a functional dormer can weaken the roof.

@BIKEMAN21 2 года назад

@@nicholash8021 building a truss seems alot more difficult then rafters and ridge board. as you mention there is also the issue of attaching mending plates. Then you also have the issue of storage space as the truss will interfere with the overhead space.

@nicholash8021 2 года назад

@@BIKEMAN21 I ended up using a ridge beam (VERSA-LAM) with 4x4 support at both ends, along with Simpson rafter ties (3-2/7-in 18-Gauge Galvanized Steel Ridge Rafter Wood To Wood). This allowed me to have a cathedral ceiling whereby I could raise my 3-person kayak to the peak as there is no need even for collar ties. Without a scratch, my 10x20 shed survived two severe micro bursts (2nd one looked like a mini tornado) each which threw an 80 foot oak tree at my deck--twice. Yep. Rebuilt it twice.

@BIKEMAN21 2 года назад

@@nicholash8021 wow that's quite a testimonial for the strength of that shed, wood of liked to see how you built it.

@andrademeza 3 года назад

How do you lay sheet on top of the ridge? Do you just leave a gap there?

@hudsonsoul1121 2 года назад

You could just raise the ridge to suit your roof covering.

@katherinemccarter8841 3 года назад

My question is after you get the total ridge height... does that include the depth of the ridge board itself? For example... my ridge board is a 2x6 so would I add 5 1/2 inches to that to have the real total at the top of the ridge board?

@TrainingHandsAcademy 3 года назад

Great question Katherine! You do not add 5 1/2 to your measurement. The ridge has little to do with the math here, but what does matter is the theoretical ridge measurement and the height above plate. I think if you rewatch the video it might become more clear to you. If you still need help, send me an email and I'd be more than happy to walk you through it.

@katherinemccarter8841 3 года назад

Never mind. I just watched the video 2 more times and I got it now‼️ I’m building a “she shed” and it my first ever construction of a building. I’m learning S I go and it’s so much.

@katherinemccarter8841 3 года назад

Sorry I cut myself off on that last post. But I think I got it figured out now. These rafters and ridge board have been the most frustrating and difficult part of my build so far. But I’m finally get things to work right. I finally got my rafters and birds mouth all cut right. That’s a miracle‼️

@TrainingHandsAcademy 3 года назад

Great to hear!!

@jaswindersoin4410 4 месяца назад

Hi from Kenya. I am really impressed by your channel. I would like to build a tiny cabin , with a 8 ftX 8 ft loft as sleeping space, with the BR and kitchenette under the loft, with an adjoining sitting area. With a not too high Gable open roof. Would you please design one for me? I will gladly pay for it. Have a great weekend

@TrainingHandsAcademy 4 месяца назад

Hello, thank you for the offer but I don't do design work.Wish I could help. :)

@porfiriogarrido398 4 года назад

a question a ceiling 8 12 how much for every 12 inches is 6 inches or is it 8 inches? Thank you

@TrainingHandsAcademy 4 года назад

Hello Porfirio! 8 inches.

@porfiriogarrido398 4 года назад

thanks for your answer

@romanopatrocinio9882 2 года назад

I have a total run of 4.05. Can you please give me how much pitch do I need.

@gerglynn5 Год назад

May 1st 2023 I set up a model of a shed. When I had the figures worked out, I cut the rafters, however the top of the rafter did not meet the top of the ridge board, rather it extended a short distance above it. What am I missing Ger

@TrainingHandsAcademy Год назад

Please share your math with me and I'll see if I can help.

@gerglynn5 Год назад

Ridge board at 12 inches high. Run at 12 inches minus half the thickness of the ridge board 3/8 inch. Used the Pythagoras method to find the length of the rafter. Made the two vertical cuts and the birds mouth. Birds mouth fitted fine but the top of the rafter rested above the top of the ridge board. Rafter rested flat against the ridge board but as I said the top of the board sat higher than the top the ridge board. Must be something small I'm missing. Thank you for your interest. Ger

@gerglynn5 Год назад

@@TrainingHandsAcademy Hi Another sample of my actions ,leading to incorrect result. Rise squared+ run sqd = rafter length 7sqd+ 11 5/8= 13.56. 11 5/8 represents run length minus half the thickness of the ridge board. Ger

@TrainingHandsAcademy Год назад

@@gerglynn5 Should like you didn't take into account the height above plate.

@Ratz_ow 10 месяцев назад

i know that this video is very old but i am a newer carpenter and I havent done too much fresh framing. mostly repairs. im only 17 but im getting into it. i understand everything from your first video and i get this one too I just want to know why you need to know the height of the ridge? it seems that you didnt need that to lay the common rafters so what is it for?

@TrainingHandsAcademy 10 месяцев назад

Hello, great question. You would need to know the height of the ridge if you where say building to a specific height... say trying to match something else, or even making sure that what you're building isn't higher than say codes allow. Does that help you?

@billscannell3876 3 года назад

HI. So in your example, the height of your ridge board is from the "top of plate" to the" top of the ridge" which is 21 5/8? Not from the bottom of the bottom 2x4 you have in your example to the top of the ridge. I like to be certain I know what I need to do before I venture into something like this.

@TrainingHandsAcademy 3 года назад

Hey Bill! Yes, ridge height is measured from the top of plate (which is the top of the second plate) to the top of the ridge... and not from the bottom of the bottom 2x4. Hope that helps

@freemansame8062 Год назад

First , Thank You. love your explanations, great work ! my quetion is if i want to reverse things... lets say i have a fixed height of 1000mm (right on the wall, no ridge board..), my total run is 2000mm and my HAP is 150mm. now ..if I want to find my 'measuring line', can i just subtract from my 1000mm fixed height the 150mm HAP and do my math on measurements of 850x2000 (Pythagorean theorem) ?

@TrainingHandsAcademy Год назад

If I'm understanding you correctly, yes, once you subtract the HAP you are back down to the theoretical measuring line... which is where the Pythagorean theorem gets you to. Check out more of my rafters videos if you haven't already... start maybe with this one. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fNX430YLuN4.html

@freemansame8062 Год назад

@@TrainingHandsAcademy You understand me correctly buddy (despite my English :), if you stumble upon RU-vid or Google, you will find that most of the time the explanations starts with a pre determined roof pitch or angle thats leads you eventually to your `total ridge height'. the reverse process, when the total ridge height is given, and you need to go down to the wall plate with your rafter, is hard to find. love to see the reverse process involving the other factors like the 'theoretical ridge height' (F) and how ridge thickness affecting it in the way of getting your precious 'measuring line' (with basic calculator). Thank You So much for your lightning fast reply. i have watched all of your rafters videos and learned a lot, you're awesome !

@TrainingHandsAcademy Год назад

@@freemansame8062 Thanks for the feedback and the great video idea! You rock!

@freemansame8062 Год назад

@@TrainingHandsAcademy It will be great to know how to deal with odd roof pitch (eg 4.23/12 and so..) and when its time to convert to angles (if at all..?), the average Joe or hobbyist who takes his total run/rise measurements to an online ‘roof pitch’ or ‘rafter length’ calculator (stringers to..), will get frustrated with the results, some are simply measuring from ridge to plate, assuming that this will be their roof pitch or angle, will eventually bang their heads against the ridge board. If they just knew about the ‘measuring line’ , they will save a lot of time and headache (or even guesses like this...ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YSTzGRs1UW0.html&ab). I think that the precious measuring line, should have a chapter of its own 😊 Thank You for your efforts !

@danielyeroshalmi7492 Год назад

see, if i wanted to lean a chicken rung on wall, how would I know what angle to cut the wood in order for it to be flat on the wall while the bottom is say, 1 1/2 feet from the wall.... i wanna learn how to do that. like could it be a 41 degree angle?? like is there a specific angle? idk

@mwa1252 10 месяцев назад

I was listening to this while trying to make calculations on a paper but was getting confused by the calculations. So I looked up to watch what you were doing and noticed at around 2:43 you said "B is the unit run" but you were pointing at the "unit rise." Am I correct in assuming that you misspoke?

@TrainingHandsAcademy 10 месяцев назад

Yes, I misspoke.

@tillmansr2002 3 года назад

Good video, however I don't understand the possible sequence. It seems the ridge height was determined after the HAP was determined. However the HAP was determined after the rafters were in place, which attached to the already placed ridge beam. How is this possible? In summary how can the HAP be determined without already placing a ridge beam and setting at least one rafter?

@BIKEMAN21 2 года назад

you make an error. HAP can be established without determining the ridge height. To lay out a rafter you need only 3 lines drawn at the pitch of your roof. if your rafter is 2x4 then 1.5 inches could be the depth of your seat cut. then 90 degree from that you measure along a 90 degree line whats left. thats would be your HAP.

@felalungtau5255 Месяц назад

Sir,please tell me standard formula of rafter

@jonienglish3231 3 года назад

@2.50 when you did the Math to Get 17.5" looks like you Rounded the Number up ? Actual Calculation = 17 7/16" ( 17.4375") 1/16" Difference

@mariomacias4551 2 года назад

I got the same thing

@jonienglish3231 3 года назад

21 5/8 - 7 1/4 = 14 3/8" FOR RIDGE POLE !!!! CORRECT ????? you Forgot To Mention That ! Good Visual Break Down Keep up Good Videos

@AppleKid Год назад

What is the formula to find the height above plate without using your tape measure? Example: 2 x10 is 9 and a quarter?

@TrainingHandsAcademy Год назад

This video should help you ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fNX430YLuN4.html

@AppleKid Год назад

@@TrainingHandsAcademy Thanks. I get it a little better but I would like to know how to do it using a construction master pro calculator. I see that you can plug the numbers into a website that works. But when I am on the job, I would rather know the formula and plug it into my calculator.

@luxigels_bymia9821 Год назад

I think The formula to calculate the height above a plate without using a tape measure is: Height = (Number of inches in the nominal size of the lumber - 1.5 inches) For example, a 2x10 board has a nominal height of 10 inches. Subtracting 1.5 inches from this nominal size gives a height above the plate of 8.5 inches.

@007_Damo 3 года назад

Here is how to get the pitch if you don't know the ratio i.e. 12/12 = 45 deg. A= Top Ridge, down to top of wall plate . (Horizontal) B= Half span (Vertical) A/B eg >>>> 1220/2075 = .58 tan-1 of .58 = 30.11 so the pitch will be roughly 30 degrees

@ElJoeRN 3 года назад

Anyone know what language this is?

@calcollier7366 3 года назад

@@ElJoeRN Joe, tan-1 is ATAN, a geometric function to calculate the angle of the Hypotenuse-to-Base, or Rafter-to-Run in this case. I think Damien got his Horizontal and Vertical labels mixed up though... too much multi-tasking?

@reigngage 2 года назад

@@calcollier7366 my 10th grade geometry teacher can go soak a toa...if he would've used carpentry to show the relevance of it all the hot pants and sizzle skirts wouldn't a been so distracting.

@rm4305 2 года назад

Hello all ! My common rafters are 8 ft long , I want a 2 ft overhang and a 6/12 pitch . Can someone help me calculate the run ?

@tcidevelopment5996 Год назад

85.867 run or 7'-1-13/16"

@tcidevelopment5996 Год назад

Minus 1' 9-7/16" I forgot you Have a 2' over hangs

@user-zc7ck3qo8d Год назад

Podria aver una traduccion

@deaowsooknanan1934 2 года назад

I have roof length 16 ft what is height of cutting rafter

@bazamali6123 3 года назад

Thanks it’s good informative video but your so fast my friend please go slow that every one who is learning can get this very easy thanks

@TrainingHandsAcademy 3 года назад

Thank you for the comment. I will have long-form classes coming soon on my website.

@bazamali6123 3 года назад

Training Hands Academy good one mate

@percedog 3 года назад

Agreed, way too fast for me as a novice

@tZydeco 2 года назад

@@percedog - while viewing the video (not the gomments) click on the three dots to the upper right, there is a setting to reduce the speed.

@samuelmandarelli2645 Год назад

Watch the video over and over and over… just like carpentry… you must do it… over and over and over in order to master it.

@sandradelgadillo9430 Год назад

I watched the previous video and i'm still trying to understand...All i want is to learn how to do a cat house, extreme weather safe, good quality, cat house. Some numbers later & this is what I understood.. Pythagorean theorem, He saw a bird he was trying to save, he spun, no, he span, instead he runs halfway. Meanwhile the dog ruffs out loud (pure Raughfter) at some length needless to say. And the poor bird he was trying to save ended up in the cat's mouth or was that the other way around? 🤔 I think I got it, thank you.

@garymccann9395 Год назад

How do I calculate location of Birds Mouth on Rafter

@TrainingHandsAcademy Год назад

I have other rafters videos that explain this. Please check them out here. ru-vid.com/group/PLCUwe6NrnQaNPCJl4y7nGaAyzWNuF0dpz

@russsterns2656 3 месяца назад

You meant unit rise not unit run? Correct...otherwise, a great demonstration!

@donatellocomunica6386 3 года назад

Do you have 48 we can do on 12/12

@brodefineportraiture446 2 года назад

easiest way is height = the square root of rafter length squared - run squared. This is the height to the bottom of the ridge. Dont forget to subtract half the thickness of the ridge from the run measurement. Then subtract your desired HAP

@TrainingHandsAcademy 2 года назад

Thanks for sharing. When you say bottom of the ridge do you mean the measuring line?

@brodefineportraiture446 2 года назад

@@TrainingHandsAcademy bottom of the rafter not accounting for ridge extra size

@brodefineportraiture446 2 года назад

its just calculating for a=height of a right angle triangle which is the air space in our rafter triangle

@walterrichardson43 Год назад

Reminds me of road runner

@brucestuart9947 Год назад

"Crown" facing up. What is the crown?

@GosmoreDaley-lb5ux 6 месяцев назад

I'm like it I need to no more

@ricardodelpozo2486 Год назад

Are u still helping with questions? On rafter hieghts?

@TrainingHandsAcademy Год назад

Yes, I'm always here to help. Have you watched all of my other rafter videos? Most likely your question will be answered in one of those. If not, ask . :)

@BerzerkerXking 2 месяца назад

Your videos are awesome but I'm a dumbass and I'm dying trying to wrap my head around it all 😂

@TrainingHandsAcademy 2 месяца назад

Ha! Did you watch my other rafter videos... like the step-off method, it's easier to follow. Let me know.

@BerzerkerXking Месяц назад

@TrainingHandsAcademy checking them out thanks buddy and really appreciate the work

@t.glover3096 Год назад

I agree the speed is too fast for beginners like me

@calcollier7366 3 года назад

If I'm just using 2x4s for my rafters in a playhouse, I've read the seat-cut of the birdsmouth should be no longer than 1.5 inches, less I compromise the integrity of those rafters. Does that sound right? Also, my ridge board was going to be a 2x6, but that board is so warped I've given up on it - and I want to use a 2x2 below a 2x4 as a "ridge board". I'm using simpson ties to keep them together. Would this be ok, do you think? (My building is pretty small, mostly a 4x8 floor plan, with one wing extended out, but not too far). Finally, in the video, you meant to say "B is the Unit Rise" @2.42, you accidentally said "B is the Unit Run". You never use the phrase "Total Adjusted Run", which I've heard used as "Total Run - Ridgeboard width". I've watched too many carpentry videos trying to nail the rafters and roofing. I think your approach to using just the speed square and calculator are pretty simple.Thanks again for your videos.

@TrainingHandsAcademy 3 года назад

Yes, 1.5" sounds about right, just as long as you're around the 1/3 mark of the rafter width. I would personally use a solid piece of ridge material, and yes, I did mean to say unit rise, good catch! :) If you get building and have more questions, find me on Instagram so that you can share photos or videos with me.

@brandonbrown2533 Год назад

The height is acutely 17 7/16”

@LifeAdventurer1 9 месяцев назад

Maybe a stupid question, but I can't figure it out...If you weren't going to put in a bird's mouth for some reason, wouldn't the angles and other stuff be wrong? Thanks for any clarification!

@TrainingHandsAcademy 9 месяцев назад

I'm not quite understanding your question. Can you ask it a different way? I would also recommend watching my other rafter videos because your answer probably lies within one of those. Either way, let me know if you still need help. Thanks for the comment.

@deaowsooknanan1934 2 года назад

16 ft roof what is hight cutting ridge

@JohnDoe-kp3sw Год назад

When it comes down to it ,it's simple geometry.what 7th maybe 8th math

@jamesakins8795 3 года назад

how to get rise

@TrainingHandsAcademy 3 года назад

On plans or you choose what will work.

@darrenjowett8032 8 месяцев назад

I got 21”9/16

@stevegambino9226 Год назад

so in fact, a 9/12 pitch roof is never really 9/12. your example would be height of ridge divided by run. which is not 9/12. 9/12 would be .75 and your calculation works out to be 21.625/24=.9 If you draw it as a true 90 degree right triangle you will see the slope (hypotenuse) and that the roof rafter is at a different slope. Seems to me the only way to get an ACTUAL 9/12 pitch, or any other pitch, would be to use a pattern with actual rise and run layed out, then lay your intended lumber over it and mark it out.. The only way you can use the step off method is if the roof rafter is a line, not a board. let me know your thoughts. Thanks,