Pitched roof calculations. Part 2 - Calculations

Calculating the triangles in a pitched roof

[@fongbrothers]

100 percent the most understandable explanation. THANK YOU!!!

[@buhaysolarista2275]

Perfect! Just what I needed. Subscribed and thank you!

[@DesmoProfundis]

After spending a solid work day messing around getting this wrong using all the right math, and then hours on KZbin looking for someone with the answers I was looking for, finally here I am watching your video. Honestly, I'm glad I had this so twisted because now I will never forget what right looks like. I'm looking forward to going to work tomorrow and looking like a dang super star. Thanks!!!

[@mattthechippietrainer]

I’m glad you found it helpful. Thanks for the comment.

[@amosmathias7051]

Thanks Matt , love how you explain the formula 👍

[@apatterson8128]

Extremely helpful and well thought out.

[@stevenhughson1]

managed to work out my rafter size using your formulas many thanks steve.

[@jacobbinoka2541]

Hey Matt thank you so much for this.

[@eliantonioscaldaferri8465]

Excellent explanation, good.

[@OG_Sasquatch]

great stuff. thank you

[@milwenguerra3666]

Thank you! You did explained very well! 😁

[@barrygaynor1025]

Thank you. Well done!

[@ladytradiej8027]

So, if I'm in a roof and want to figure out the rise where do I put my tape measure? The X Y line? or the underside of the ceiling joist? Then where do I measure vertically up to? The Apex?

[@aaron-hk8zg]

Thanks for the video really helped

[@macasachristianp.8537]

thank you so much sir, it really helped me a lot.

[@scottfroud678]

Hey mate. I love the video, easy to understand, Thanks! What program did you use to draw those diagrams? I would like to drawer out some stuff like this.

[@mattthechippietrainer]

This is just a power point that I have used so I could flick through while recording. On other videos I have used Sketchup free. That might be better for computer modelling.

[@vinopit]

so on a speed square if we have 30 degrees i can use 6 pitch for common rafters?

[@arifcankal3562]

Perfekt and very good 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

[@vinopit]

my question is about metric speed square? in imperial pitch is rise per 12 inch run. whats how is it in metric?

[@SurajSobhanaTrolls]

Thank you👍🏻

[@JoseSanchez-xd1oz]

Thanks for good video.

[@ramadossvenkatesan8872]

easy to understand, god bless

[@adebad1]

Thanks Matt. I'm designing a roof but only have the run and not sure the angle or the rise. İs there a metric formula to determine those factors?

[@mattthechippietrainer]

If you are trying to match an existing structure then hold a level against the roof at one end, then measure how high the level is at the other. Then you can calculate the angle.

[@connorramm1038]

Great video, is the a formula to work out the angle using rise and run which includes the size of timber being used, example a 6x2

[@mattthechippietrainer]

No. The calculations are just geometric lengths. The size of the timber is then marked from the backing line.

[@connorramm1038]

@@mattthechippietrainer thanks for the reply

[@jaileermakers3362]

Hey Matt, how do you work out the overhang geometric length? What is the formula? Cheers.

[@mattthechippietrainer]

Same formula, watch from the 6 minute mark. just use the overhang from the plan for the run.

[@fidelnefy]

30º degrees is a standard angle or why did you use this angle?

[@mattthechippietrainer]

I selected this angle at random. There is no special reason for it.

[@aaronbenz3694]

What is a common birds mouth size? Taking the birds mouth to maximum depth which would be a third of your timber ? Does that change the pitch?

[@dadattitude5918]

No it doesn’t change the pitch. You only need a bird’s mouth cut big enough so that the rafter sits on the top plate properly.

[@jamesthomas2130]

What about the bird mouth doesn’t that change the size by 20mill

[@cameronhesling6189]

Hello mate I’m building a little porch tomorrow and need to work out my top ledger to attach my rafters to my wall plate how do I work out how high the rise is for me to put the ledger at with it being 40°

[@olegoleg8652]

perfect

[@vinopit]

What software are you using

[@mattthechippietrainer]

It's just a power point that i recorded on screen.

[@gaganpreetchahal4390]

Hey I am planing to starting my business of roofing can you how to messure roof for charge

[@aldrinpadua28]

What if there is no given degrees at the moment? how to get the degrees. I have only the RUN and the SPAN?

[@mattthechippietrainer]

Normally a set of house plans will give you the pitch. If you are trying to match something existing and you don’t know the pitch then you can get a height measurement and work out the pitch from that. Watch the video from the 10 minute mark for the formula.

[@markleeks1116]

I use a calculator most of the time. Yes from bird's mouth to ridge is 5.773 m. ( Less half the ridge) Rise = 2.885 2.885 / 5 = 0.577 INV ARC (tangent) 0.577= 30° Love mathematics!

[@matingpamathew1986]

Halo do u have any drawing foe this.

[@silvanskodingo5221]

What calculator are you using because my Samsung calculator gives me 166.6666666667 when I divide 5000mm by 30 degrees? Am not good in mathematics and I find calculating the pitch of a roof as one hell of mathematical conundrum that has outstretched my foraging mechanisms.

[@mattthechippietrainer]

Samsungs work differently to other calculators. You may have to put brackets in the right places to get it working. You can also use a triangle solving app. Trigsolver or something similar are very easy to use.

[@mrrmut57]

Hi Matt, If my span is 5200mm and my geometric length is 7100mm what is my angle and what is my rise please?

[@markleeks1116]

I d help but what do you mean by the 7.1 m

[@victorinteriorpessah771]

Who type of calculate are you using iwant to download it

[@mattthechippietrainer]

I didn’t download it. It was just the one that was already on the computer when I got it.

[@victorinteriorpessah771]

@@mattthechippietrainer my calculator is working like yours but like your formula

[@philmyglass8103]

Good video Matt ... be better if you showed the calculation to find an angle/degree° using tan on a random set rise and run, just saying!

[@mattthechippietrainer]

This is covered in the video from about the 10 minute mark.

[@philmyglass8103]

@@mattthechippietrainer ahhh i didn't get that far in the vid....doooooh!

[@steveocampo5160]

3:55 someone explain??

[@DescendantsofBossaya-lj5ox]

Simple but difficult for some of us . I want you to help us without using calculator, how to find the height of a roof when the pitch angle is only given

[@mattthechippietrainer]

Have look at this series which shows how to cut a roof without the calculator. kzbin.info/aero/PLnaiMNCN8n7PZPn6TBpyiyWBspkR2HBf6

[@DADunkin200947]

STANDARD MEASUREMENT, PLEASE.

[@sathishjay8405]

How do i calculate......wall A 7 ft and wall B 6 ft......distance between wall is 4 ft,....now what is slope distance of the walls from 7ft to 6 ft?

[@mattthechippietrainer]

4ft is your "run". The difference in height is 1ft, this is your "rise". watch this video from the 8 minute mark. Hope this helps. kzbin.info/www/bejne/sGTdiKZ3r9uBpMk

[@E-E.ADVENTUREGEARS]

Are you based in aus?

[@mattthechippietrainer]

Yes I am. 😊

[@pardeepsaini5896]

I was looking for the same thing😊 Btw thanks