cutting rafters, what is the formula?

macafee2 · 6th May 2021, 21:23

Cutting rafters, really interesting video but a bit I dont understand.
watch this video from 13.00 https://www.youtube.com/watch?v=gz-Ej0qY1pQ

He uses a calculator to work out the length of part of the rafter but what is the formula behind the answer?

Also, from 15.00, when he draws the plum line, wont the angel change if the rafter is not, as i'll say, wide ? How will it stay accurate?

Is the answer in his left hand at 21.349? was I looking in the wrong place for his 7 inch measurement?

If I could remember all of what he said I could build a roof. An excellent video

macafee2

6th May 2021, 21:23	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,928 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	cutting rafters, what is the formula? Cutting rafters, really interesting video but a bit I dont understand. watch this video from 13.00 https://www.youtube.com/watch?v=gz-Ej0qY1pQ He uses a calculator to work out the length of part of the rafter but what is the formula behind the answer? Also, from 15.00, when he draws the plum line, wont the angel change if the rafter is not, as i'll say, wide ? How will it stay accurate? Is the answer in his left hand at 21.349? was I looking in the wrong place for his 7 inch measurement? If I could remember all of what he said I could build a roof. An excellent video macafee2