I just wanted to say thanks for your efford and i saw many videos and on your videos everything started to make sense.very helpful and i would say probably the best people can find on net..you dont need to do a metric video with angels cause who wants to learn can do it on their own.greetings from croatia
Thanks for the kind words. Glad someone is interested in learning the math. If you'd like to download a free excel based roof framing calculator that I created, please see: www.dropbox.com/scl/fi/7jg91w83i8vsxqn2x334s/Rafter-Calculator.xlsx?rlkey=3ywhejty0sjjma54bagctor5x&dl=0
I have copies of the Velocirafter DVD, which you can order through the website. There is an excellent book by Marshall Gross which covers irregular hips.
The roof framers bible states that to calculate ridge length you add the total ridge thickness to the length, you're stating you add half the rafter thickness (for double hip roof). What I don't understand is the the center line doesn't change the thicker the ridge becomes... who is right...
Hi Jesse, take a look at the illustration at 0.47 part 4. Grow the ridge at each end by 1/2 the rafter thickness. That would total the rafter thickness (2x 1/2 the thickness)
@@musvolk thanks, I understand your explanation it’s rather i forgot that you have to add the material back to the ridge because you deducted half the ridge thickness from your common rafter run. I was concentrating on the ridge to much to zoom out and realize the steps prior. You half to add half the ridge back to simply have an accurate measuring line which enables proper hip installation etc or the rafters would come up short
great and informative but i think your 'mathematical run' is incorrect. if a line is bisecting a 90 degrees angle at 45 degrees, any horizontal and vertical lines from the same point will form a square. therefore the hip rafter is automatically the hypotenuse. so 2' squared plus 2' squared equals 8'; the square root of which is the distance along the hip rafter if the jack rafters are set at 2' center. 2'x2' + 2'x2' = 8'. the square root of 8' is 2.828' ( 2' 9 15/16" ) the mathematical run.
Hi Peter. For common rafters use this formula: a^2 + b^2=c^2. Ex: 9^2 + 12^2= 225 sq. rt = 15 (unit run). For Hip rafters use this: a^2 + (b x 1.414)^2 = c^2. Ex: 9^2 (81) + (12 x 1.414)^2 (287.9) = 368.91 sq. rt = 19.21 (unit run). Multiply the span by the unit run to get your rafter length. Hope this helps
I just wanted to say thanks for your efford and i saw many videos and on your videos everything started to make sense.very helpful and i would say probably the best people can find on net..you dont need to do a metric video with angels cause who wants to learn can do it on their own.greetings from croatia
Thanks for the kind words. Glad someone is interested in learning the math. If you'd like to download a free excel based roof framing calculator that I created, please see: www.dropbox.com/scl/fi/7jg91w83i8vsxqn2x334s/Rafter-Calculator.xlsx?rlkey=3ywhejty0sjjma54bagctor5x&dl=0
I have copies of the Velocirafter DVD, which you can order through the website. There is an excellent book by Marshall Gross which covers irregular hips.
Good thanks for the information
The roof framers bible states that to calculate ridge length you add the total ridge thickness to the length, you're stating you add half the rafter thickness (for double hip roof). What I don't understand is the the center line doesn't change the thicker the ridge becomes... who is right...
Hi Jesse, take a look at the illustration at 0.47 part 4. Grow the ridge at each end by 1/2 the rafter thickness. That would total the rafter thickness (2x 1/2 the thickness)
@@musvolk thanks, I understand your explanation it’s rather i forgot that you have to add the material back to the ridge because you deducted half the ridge thickness from your common rafter run. I was concentrating on the ridge to much to zoom out and realize the steps prior. You half to add half the ridge back to simply have an accurate measuring line which enables proper hip installation etc or the rafters would come up short
Hi Mark
Got a challenge for you
Can you do it in metric with a pitch of 20 degrees
Them inches just can't get it
How to make 6×4 feet roof
Where is the valley rafter video
Purchase the DVD for the valley rafter videos, 60 page pdf book and more. Visit www.velocirafter.com
@@musvolk does the DVD cover irregular hip
Not this DVD, sorry.
@@musvolk ok you have one
@@musvolk p
great and informative but i think your 'mathematical run' is incorrect. if a line is bisecting a 90 degrees angle at 45 degrees, any horizontal and vertical lines from the same point will form a square.
therefore the hip rafter is automatically the hypotenuse. so 2' squared plus 2' squared equals 8'; the square root of which is the distance along the hip rafter if the jack rafters are set at 2' center.
2'x2' + 2'x2' = 8'. the square root of 8' is 2.828' ( 2' 9 15/16" ) the mathematical run.
Hi Peter. For common rafters use this formula: a^2 + b^2=c^2. Ex: 9^2 + 12^2= 225 sq. rt = 15 (unit run). For Hip rafters use this: a^2 + (b x 1.414)^2 = c^2. Ex: 9^2 (81) + (12 x 1.414)^2 (287.9) = 368.91 sq. rt = 19.21 (unit run). Multiply the span by the unit run to get your rafter length. Hope this helps
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