Learn how to measure the total square footage of a residential steep-slope house roof in this InterNACHI home inspection training video for contractors and inspectors.
Man thank you after watching you break down every formula I realized on certain roofs I was only doing it half right, thanks for being precise in your explanation of the diagrams. One thing that did confuse me is when you said measuring a hip is base x hight, x1 half and that's your answer. Actually it's base x hight then divide your answer in half. Again thank you for breaking down how to measure the different roofs. My name is Jim Adkins I'm on my wife's you tube page. I work for durst roofing in Youngstown Ohio
Perfect! I want to thank you Sir for simplifying which in some cases can become a complex process. You have made it easy for me to calculate the square footage of my roof and converting that to the number of squares needed.
Ben this video most definitely refresh my memory, I almost grab my pen and paper and started to make up my own measurements 😂😂. Thank you for making this video. Very easy. Very simple
Omgosh, thank you, thank you, thank you.. This is exactly what I was looking for. Now I can go backup and measure my own roof correctly and accurately. Well as soon as the snow is gone. This has been very valuable. Now if I can just figure out how to sketch it in Xactmate with all the different roof elevations!! One step at a time!!! Thanks again!!
Excellent excellent presentation I sell renovations and roofing I'm still in the learning curve of how to measure roof properly this is very helpful thank you
Ben, great information and refreshers. However, I need to be refreshed as to how to do measurements without the roof plans, using the elevation plans. Do you have a tutorial for this?
A software package has been developed to make such measurements. But knowing how to do this manually is necessary. Knowing the basics first is necessary in any profession.
Nick, multiplying something by 1/2 or dividing by 2 equals the same number... Example : 100 divided by 2 = 50 or 100 x .5 (1/2) = 50... So, you can do it either way...
Yes expanding on what Eric Brennan Said when talking about trapezoid in the beginning you said Base 1+Base 2 divided by 2 at the end you in the final summary of all the calculations it says Base 1 + Base 2 x 1/2 and at the end you say the same thing but it shows Base 1+Base 2 divided by 2. Which one is it? Can you please correct this or can someone comment or leave a video note?
When you do trapazoids that are equal in length you dont need to multiply by .5.....16.3+10*5 gives you the square feet for both. What happens is when you divide by .5 you are just getting one side and then you do the same for the other and then add them, seems redundant. None the less great video, I learned something new today
Could you combine the overlap of A3 gable and main house as (60x10) and do the remaining gable as rectangular measurement (10x10) to avoid the subtracting step? Thank you for the very informative video.
Most welcome 😊. Thanks for watching. Interested in becoming a code inspector? Check out our free online course at forum.nachi.org/t/new-free-online-course-to-become-a-code-inspector/185930.
This works in simple roofs like a shed roof home but when you have gables and eves and rakes it's tougher I use this sky measure software whe 're you pay 40 to get the aerial Square footage of a home only thing it's not always guaranteed if there's alot of trees covering the home that's the only disadvantage
So the software that I'm using is Sky measure powered by core logic, so 80% of U.S. homes sold are included in property imagery, averaging 9 images per home so more than likely it could definitely save you time and money their fees vary I haven't paid but 40$ per home we've done, but it saves a ton of time in the long run they also have an app for easy login access
There is no need for this complexity in calculating the area - it is simply 60x10x2 = 1200 20x10x2 = 400 10x5x2 = 100 6x5x0.5x8 = 120 Total 1820 It is hard to believe that home inspectors would need training on such a basic estimation.
It's far beyond the scope of a home inspection to measure the squares or area of a roof covering. The scope of a home inspection is primarily based upon identifying indications of defects, not estimating or measuring areas of roof covering materials. That job is for the roofing contractor that would be recommended by the home inspector in their inspection report. But we do our best in training our home inspectors on just about everything a contractor would need to know.
In regards to the trapezoid measurements: At time 3:06 you stated (B1 + B2) x H) / 2 to get the sqft. Then at time 6:06 you stated (B1 + B2) x H) x 1/2 to get the sqft?? Which one is correct??
Lol the lazy stupid modern American worker Vs the old Disappointed jerk Old School worker who complains about the new generation Or the Hispanic workers. That’s what construction is today
Ben, when you show the East gable at 6:08 in the video you explain the base as 2 different lengths. Why do you show 10 foot and 16.3 and not just a 3rd line showing 26.3 length total. This looks confusing when looking at the roof design. So what your saying is that from the edge of the main roof to the end of the gable is 10ft and the triangular portion length is 16.3 feet? why would you double a length just to subtract the triangular portion. Couldn't you just measure the triangular parts of the roof and do it separately? Then subtract the triangular portion from the main portion of the house? it confuses me how you take two lengths add them together then do your base X height X 1/2. Please let me know why its done this way
Ben Gromicko oh my goodness. I saw it as 2 bases of 10 and not 2 separate bases due to the triangle outlining on the roof example. I see where you are coming from now
The calculation is not A1, A2 and A3 is not as complex as described. It is simply 60x10x2, 20x10x2 and 5x10x2 or 2100 total. No need to add and subtract the common triangles.
Home inspectors may report degree of slope in their inspection reports, but it's not required by the Standards of Practice for Performing a Home Inspection. I submit that most home inspectors would use a ratio to express slope instead of a degree, such as 2:12 or 4:12.
+Ben Gromicko if I measure a roof let say 1000 sq ft I add 10% waste for a gable roof and 15% waste for a hip roof otherwise I would be short on material
We have Certified Master Inspector® Instructors who provide online and live classes about roofing. You may be interested in the roof training resources at www.nachi.org/3c.htm
Okay, Magdalena. I'm not sure what you are trying to say. But if you want to take the online exam again, you may. Our online inspector exam can be taken again and again, as many times as you want. Members have unlimited access to all of InterNACHI's free, online training and Continuing Education, our recommended list of home inspector courses, our free certification programs, the members-only forum, amazing membership benefits, the Online Inspector Exam, our free Inspector Training App.
So going by this equation for hip roof I only need 1.5 square for one trap, b1 42ft b2 15ft H 15ft, b1 plus b2 x H ÷ 2 for one trap. I need 5 sheets of plywood for bottom course, that 1.5 sq of shingles, total thumbs down
Hi, Michael. If you new to the roof inspection business, you may be interested in the online roof training courses we have made available for free to our members at www.nachi.org/3c.htm
I've measured alot of Roofs, in my day. I personally think; you made this sound, more complicated, then it really is. Your graphics, for the trapezoid, were useless. I stopped watching there.
Man thank you after watching you break down every formula I realized on certain roofs I was only doing it half right, thanks for being precise in your explanation of the diagrams. One thing that did confuse me is when you said measuring a hip is base x hight, x1 half and that's your answer. Actually it's base x hight then divide your answer in half. Again thank you for breaking down how to measure the different roofs. My name is Jim Adkins I'm on my wife's you tube page. I work for durst roofing in Youngstown Ohio
Thanks for the feedback. Glad it was helpful.
Perfect! I want to thank you Sir for simplifying which in some cases can become a complex process. You have made it easy for me to calculate the square footage of my roof and converting that to the number of squares needed.
Glad it helped! Thank you for watching. Feel free to reach out to us for help any time at www.nachi.org/contact.
Hi Ben, excellent job with the videos. You are a true teacher!
Thank you for the feedback.
Ben this video most definitely refresh my memory, I almost grab my pen and paper and started to make up my own measurements 😂😂. Thank you for making this video. Very easy. Very simple
Thank you. I'm glad to hear that you find it a valuable.
Best roofing measure video I've seen, thanks for sharing
Thank you for the feedback. We appreciate it.
Omgosh, thank you, thank you, thank you.. This is exactly what I was looking for. Now I can go backup and measure my own roof correctly and accurately. Well as soon as the snow is gone. This has been very valuable. Now if I can just figure out how to sketch it in Xactmate with all the different roof elevations!! One step at a time!!! Thanks again!!
You're welcome.
This video was just what I needed! Thank you!
Thank you. Glad to liked it. We have more on www.nachi.org/tv/
Thank you for taking the time to show this sir!
You're welcome. Thanks for watching, Junio.
Thank you so much Ben! IT's so easy and to the point!
You're welcome.
very straightforward and professionally done. Bravo ! kiss
Hm. Yes.
Thank u so much,i just can't stop watching you.This help my knowledge
So nice of you
Nice video keep it up this video was crystal clear on how to learn to estimate a roof. Thank you
Thank you, HardGamer. We have a ton of roof training resources online at www.nachi.org/3c.htm
You rock. Very simple. Very informative. Very educative
I appreciate that!
Thank you for this easy to understand instructional!
Glad it was helpful!
Thank you for making this so simple even some one like myself can understand it.
Glad it was helpful!
Very help full. Thanks for sharing your power.
You're welcome.
You're welcome. It's not often I share my power. :)
THAT WAS HELLA INFORMATIONAL!!!! THANKS SO MUCH!!!!!
You're welcome, J B.
Good evening sir
Thank you for demonstration & it will help me a lot you doing very your good job,keep up your demonstration & tutorial thank you,
Thank you, Shofiq Ali.
Thank you sir this is what i need today in urgent.
This benefits me greatly. Thanks a million
You're very welcome!
Thank you can't believe how many years have been doing this and I still forget this equation
Nice. Thanks for the feedback, Devon.
Simple and well done. Thank you
You are welcome!
Wawww thank you sir I feel like you push my life forward after I take my time to understand
You're most welcome.
Very informative, thank you so much.
You're welcome.
That was very helpful, Thank you
You got it. Glad you enjoyed it, Josh. We have a ton more videos on www.nachi.tv
Excellent excellent presentation I sell renovations and roofing I'm still in the learning curve of how to measure roof properly this is very helpful thank you
Glad it was helpful!
Awesome video pal.
Thanks, pal.
Ben, great information and refreshers. However, I need to be refreshed as to how to do measurements without the roof plans, using the elevation plans. Do you have a tutorial for this?
Great suggestion! We'll have to develop a video for that.
A software package has been developed to make such measurements. But knowing how to do this manually is necessary. Knowing the basics first is necessary in any profession.
Agreed.
+RoofLogic what software is that
Moises Perez www.roofcad.com
RoofLogic thanks.
Agreed.
Nick, multiplying something by 1/2 or dividing by 2 equals the same number... Example : 100 divided by 2 = 50 or 100 x .5 (1/2) = 50... So, you can do it either way...
Thanks, Matt.
Thank you.
Thank you sir for this video you shared
So nice of you
Yes expanding on what Eric Brennan Said when talking about trapezoid in the beginning you said Base 1+Base 2 divided by 2 at the end you in the final summary of all the calculations it says Base 1 + Base 2 x 1/2 and at the end you say the same thing but it shows Base 1+Base 2 divided by 2. Which one is it? Can you please correct this or can someone comment or leave a video note?
Hi, Nick. Dividing by 2 and multiplying by 1/2 is the same thing.
Nick Jumpa (base1 +base2) ×height x 1/2 Note that whenever you multiply by 1/2 you are simply dividing by 2.
Thanks for watching.
Thank you Ben.
Welcome!
So helpful!!
I'm so glad!
When you do trapazoids that are equal in length you dont need to multiply by .5.....16.3+10*5 gives you the square feet for both. What happens is when you divide by .5 you are just getting one side and then you do the same for the other and then add them, seems redundant. None the less great video, I learned something new today
Nice.
You make it very easy :)
Thanks, Flores.
That's our goal. Thank you, Flores x 2.
Could you combine the overlap of A3 gable and main house as (60x10) and do the remaining gable as rectangular measurement (10x10) to avoid the subtracting step? Thank you for the very informative video.
Yes I can, Thanks for watching.
Well done.
Thanks, RJ.
Nice and easy , thanks
Most welcome 😊. Thanks for watching. Interested in becoming a code inspector? Check out our free online course at forum.nachi.org/t/new-free-online-course-to-become-a-code-inspector/185930.
This works in simple roofs like a shed roof home but when you have gables and eves and rakes it's tougher I use this sky measure software whe 're you pay 40 to get the aerial Square footage of a home only thing it's not always guaranteed if there's alot of trees covering the home that's the only disadvantage
You're correct, Sean. Can you please post the link to the software that you use (for others to check out and possibly use)? Thanks.
@@BenGromickoSure thing !
well said very good
Thank you.
You said multiply several times for the trapezoid measurement when it's actually dividing by 2.
You can divide by 2 or multiply by 1/2. It's the same.
This is absolutely the worst explanation of how to measure a roof. You should remove this video immediately
You can divide by 2 or multiply by 1/2. It's the same.
So the software that I'm using is Sky measure powered by core logic, so 80% of U.S. homes sold are included in property imagery, averaging 9 images per home so more than likely it could definitely save you time and money their fees vary I haven't paid but 40$ per home we've done, but it saves a ton of time in the long run they also have an app for easy login access
Thank you for the feedback, Sean.
nice video
Thanks
Awesome.hey what's up buddy.i have a cuestion .how many bags of ridge are on 92 feet.
Nice video . master.but is so much for me brain.ja
Thank you for the feedback, Juan.
There is no need for this complexity in calculating the area - it is simply
60x10x2 = 1200
20x10x2 = 400
10x5x2 = 100
6x5x0.5x8 = 120
Total 1820
It is hard to believe that home inspectors would need training on such a basic estimation.
It's far beyond the scope of a home inspection to measure the squares or area of a roof covering. The scope of a home inspection is primarily based upon identifying indications of defects, not estimating or measuring areas of roof covering materials. That job is for the roofing contractor that would be recommended by the home inspector in their inspection report. But we do our best in training our home inspectors on just about everything a contractor would need to know.
Great video! What if the rectangle has four different measurements??
Good question!
So for the trapezoid is it times or divide cause I got two different formulas that’ll give me massively different answers
Hm. I'll take a closer look.
thankyou!!!!!
You're welcome.
Same to you sir
You're welcome.
In regards to the trapezoid measurements: At time 3:06 you stated (B1 + B2) x H) / 2 to get the sqft. Then at time 6:06 you stated (B1 + B2) x H) x 1/2 to get the sqft?? Which one is correct??
Hm. I'll look again.
Regarding trapezoid. Why can't you take the two triangle areas. Add them to the rectangle area.
Could, yes.
MY HEAD HURTS
Heh. Yep. We tried to make it simple.
get back down to go pick up the trash ya bum! lol
bet you can hardly lay them shings
Lol the lazy stupid modern American worker
Vs the old Disappointed jerk Old School worker who complains about the new generation
Or the Hispanic workers.
That’s what construction is today
Ben, when you show the East gable at 6:08 in the video you explain the base as 2 different lengths. Why do you show 10 foot and 16.3 and not just a 3rd line showing 26.3 length total. This looks confusing when looking at the roof design. So what your saying is that from the edge of the main roof to the end of the gable is 10ft and the triangular portion length is 16.3 feet? why would you double a length just to subtract the triangular portion. Couldn't you just measure the triangular parts of the roof and do it separately? Then subtract the triangular portion from the main portion of the house? it confuses me how you take two lengths add them together then do your base X height X 1/2. Please let me know why its done this way
The two bases are 16'3" and 10'. (Base1 + Base2) x height / 2
Ben Gromicko
oh my goodness. I saw it as 2 bases of 10 and not 2 separate bases due to the triangle outlining on the roof example. I see where you are coming from now
Jeff W how do you measure one square? 16 squares have to be replaced on a roof how many feet is that
@@Va757P-City 1600. Square is 10x10. 1600 divided by 100 equals 16
So how did you multiply that because I got 12.6 x 12.6 = 158.76 ??
Hm. I double check the numbers.
@ 4:00 you said 10 times 8 times 2 = 40 squares. Was that an error or am I all wrong?
Never mind. I got it thanks. I’m thinking divided by 2 for half of the square
Great.
Don't the roofing tiles need to overlap at least a little bit? How is this accounted for?
Yep.
The calculation is not A1, A2 and A3 is not as complex as described. It is simply 60x10x2, 20x10x2 and 5x10x2 or 2100 total. No need to add and subtract the common triangles.
+Mick Mac Thanks, Mick Mac.
Go away, go run your calculations by someone who gives a rats ass. He explained it just fine, your just being petty at this point
That's for you Mick Mac
You also don't mention starter shingles and roof caps so whoever uses this as a home owner to attempt to do his roof will be short.
Good point, Allen. This video was produced as part of a series of training videos for home inspectors to quickly estimate how big a roof is.
Why couldnt you measure the A1 and measure A3 as LxW and not subtract two triangles per gable?
You could and save several steps and it comes out the same. I believe he showed it his way for those that new.
Yes.
Don we consider the roof angle when measuring roof.. 45 deg, 30 deg.. like that.
Home inspectors may report degree of slope in their inspection reports, but it's not required by the Standards of Practice for Performing a Home Inspection. I submit that most home inspectors would use a ratio to express slope instead of a degree, such as 2:12 or 4:12.
@@BenGromicko Solar people would be interested in knowing this...
So the total roof area must always be divided by 100 does this goes for all the roof?
Hm. I'll have to double check what was covered in the video.
@@BenGromicko great
You mixed the trapezoid area up do we divide by half or multiply. You straight up did both for trapezoid. Fix this
Hm. Not sure about that mix up. I'll double check.
Just one thing didn't mention adding wast percentage for different roofs different percentages
Hi, Syed. I don't understand. What wasn't mentioned?
+Ben Gromicko if I measure a roof let say 1000 sq ft I add 10% waste for a gable roof and 15% waste for a hip roof otherwise I would be short on material
Right. This video has nothing to do with calculating the amount of roofing material needed for a roof job.
too advanced for youtube lol
Why multiply 10 & 20 ft by 6 ft 3 in, because I thought it said 16 ft 3 in?
square
I never knew how many bundles to buy
Cool. Thanks for watching. Hope it was valuable.
6:40 that's wrong, you have to get the slope and multiply by the sloped length, not the projection
At that point in the video, we were calculating the area of the planes. Not the slope.
@@BenGromicko this means you would get the wrong number of squares at 7:58 🙄
I've got a roof with a bunch of different combinations of shapes...
That's a challenge to measure all those shapes on a complicated roof.
@@BenGromicko Yes. I did a best estimate by simplifying the shapes.
Your supposed to add 10% for shingles right
Hm. Not sure about that. For like extra mistake coverage?
@@BenGromicko no for some reason i was thinking you added 10% on shingles I am just asking
A-fucking-maxing. Thank you
Okay. Thanks. I think.
Di you Givin Roofing Classes?
We have Certified Master Inspector® Instructors who provide online and live classes about roofing. You may be interested in the roof training resources at www.nachi.org/3c.htm
Yes I did already the exam bout I'do not pass,I'm very apse
Okay, Magdalena. I'm not sure what you are trying to say. But if you want to take the online exam again, you may. Our online inspector exam can be taken again and again, as many times as you want. Members have unlimited access to all of InterNACHI's free, online training and Continuing Education, our recommended list of home inspector courses, our free certification programs, the members-only forum, amazing membership benefits, the Online Inspector Exam, our free Inspector Training App.
Can you provide for my the good answers abaut the test,Illinois is the Estate where I living,I wonts the Roofing license
Ok can you please tell my abaut the website I apreciate tha
I was just asking Google how many squares is in 1,000 cuz I want to get back to working for myselfp
Okay. What was the answer?
Well... I guess I won't be applying for a roofer position anytime soon... I might accidentally overcharge customers with calculation
It's a critical part of running a successful business: calculating profitable fees.
Ok
Ok. Thanks for watching.
Wtf do u mean by half
Not sure, Emmanuel. At what point in the video are you referring to?
@@BenGromicko what do you mean by 1½ with the triangle 📐 formula please explain
So going by this equation for hip roof I only need 1.5 square for one trap, b1 42ft b2 15ft H 15ft, b1 plus b2 x H ÷ 2 for one trap. I need 5 sheets of plywood for bottom course, that 1.5 sq of shingles, total thumbs down
Gotcha.
you lot me at trapezoid.
Ha!
I'm shingles work
Good.
Hi sir
Hello, sir.
18 yr old roofer
Hi, Michael. If you new to the roof inspection business, you may be interested in the online roof training courses we have made available for free to our members at www.nachi.org/3c.htm
Best to learn here first so you don’t look so stupid learning on the job
Cool. Thanks for watching.
Isn’t this 5th grade math?
6th.
I've measured alot of Roofs, in my day. I personally think; you made this sound, more complicated, then it really is. Your graphics, for the trapezoid, were useless. I stopped watching there.
Sorry about that, Marsh.