I wanna say thank you so much for this video. Im a 42 year old man that new this years ago but with time my mind went, lol. After 3 minutes of your video it all came to me. Thanks again.
Hi he said you could either use the Swanson book of rafter tables, or your framing square using the rafter square the pitch is 9/12 so o your rafter square the top line of engraving in words reads common rafter length per foot run, so you look for the number 9 above this writing which is gives you the number 15 you then have to times this number but half the span of your build the span is 12 feet so half is 6 do times 6x15= 90 inches you then have to add the 1 foot over hang so add 90 inches to 12 inches and you get 102 inches you need to divide 102 by 12 inch to give you the length in feet so 102 divide by 12 = 8.5 feet so 8 foot 6 inch so he used a 9 foot board, hope this helps
So he said you could use either the Swanson table guide or use a rafter square, using the rafter square (The skinny length is called the tongue. The thicker, longer section is called the blade.) the pitch of the roof is 9/12 so using the blade look up the number 9 underneath you will find the number 15, you then times this 15 by 6 which is half the span of the roof and get 90, these numbers are in inches, you then need to add the hang over for the eaves and fascia board which was 1 foot or 12 inches add 12 inches to 90 inches gives 102 inches divide this by 12 to convert to feet and inches you get 8.5 or 8 foot 6 inch so he choose a 9 foot board hope this helps
you have to take the HAP (height above plate) in your birds mouth which is the vertical distance 90 degrees from the horizontal seat cut distance and add that measurement to your total rise of your ridge board, and then subtract 3/8 of an inch due to the ridge drop.
Hello, I use the speed sq. to layout my rafters. I having a very difficult time with the birds mouth! These are my measurements: 143.25 span...71-5/8 run...3/12 pitch...17.91 rise...73-13/16 diag. I make my 1st plum cut 3/12...measure down the board to 73-13/16 make 2nd plum cut...add10.5" for overhang. I come back to the 2nd plum cut...measure up 1-1/2 inch for the seat cut, then 3-1/2 inch cut. I finish off with cutting 3/4 inch for the ridge board...it doesn't fit!!! What am I doing wrong!!!
In a 15/12 sloped roof, under the fifteen it is 19.21 in per foot run. This means that for every foot traveling horizontally the rafter is 19.21 in Long.
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Best simplified Explanation of cutting common rafters I've seen. Excellent instruction. 👍
Thanks this was the easiest way to lay out rafters compared to 20 other videos I've watched.
This is way easier and better explained than some other videos out there. Many thanks!
Thank you I’ll have to watch it again but as the other commenter,I would have to agree .very nice
Love how simple you made it for a simple man like me. Absolutely loved it!
I know how to do this but this is the best video I've seen no stupid music very very clear
Thanks for the simple explanation..
Great video sir very informative
I wanna say thank you so much for this video. Im a 42 year old man that new this years ago but with time my mind went, lol. After 3 minutes of your video it all came to me. Thanks again.
Like riding a bicycle, eh? lol
That’s one woolly looking piece of timber. Thanks for the great lesson old master
Easy explanation ... Thanks.
Very good instructions sir! Thank you!
Absolute legend
Thanks for the very informative and well explained video!
We need more videos from this master carpenter he teach good
Thank you man! Amazing teacher.
This video was very informative. Thank you so much!!
Nice Thant you
Thanks for sharing with us.
Very informative video. Thanks.
Hi he said you could either use the Swanson book of rafter tables, or your framing square using the rafter square the pitch is 9/12 so o your rafter square the top line of engraving in words reads common rafter length per foot run, so you look for the number 9 above this writing which is gives you the number 15 you then have to times this number but half the span of your build the span is 12 feet so half is 6 do times 6x15= 90 inches you then have to add the 1 foot over hang so add 90 inches to 12 inches and you get 102 inches you need to divide 102 by 12 inch to give you the length in feet so 102 divide by 12 = 8.5 feet so 8 foot 6 inch so he used a 9 foot board, hope this helps
Thank you for this information!
Thanks for your knowledge..
Excellent job!
Wao that is a great video thank so much for that infomation
Good explanation
Most videos I watched do not consider the thikness of wall which is usually 3/4" and has to be added to birth mouth/seat cut. At the plumb side.
That will be bird mouth.
How did you come up with a 9" ft board to start with?
So he said you could use either the Swanson table guide or use a rafter square, using the rafter square (The skinny length is called the tongue. The thicker, longer section is called the blade.) the pitch of the roof is 9/12 so using the blade look up the number 9 underneath you will find the number 15, you then times this 15 by 6 which is half the span of the roof and get 90, these numbers are in inches, you then need to add the hang over for the eaves and fascia board which was 1 foot or 12 inches add 12 inches to 90 inches gives 102 inches divide this by 12 to convert to feet and inches you get 8.5 or 8 foot 6 inch so he choose a 9 foot board hope this helps
How do you ensure that when cutting the birds mouth the rafter will meet at the top of the ridge
If you follow all the steps it will meet at the ridge board
you have to take the HAP (height above plate) in your birds mouth which is the vertical distance 90 degrees from the horizontal seat cut distance and add that measurement to your total rise of your ridge board, and then subtract 3/8 of an inch due to the ridge drop.
My teacher assigned this
Hello, I use the speed sq. to layout my rafters. I having a very difficult time with the birds mouth! These are my measurements: 143.25 span...71-5/8 run...3/12 pitch...17.91 rise...73-13/16 diag. I make my 1st plum cut 3/12...measure down the board to 73-13/16 make 2nd plum cut...add10.5" for overhang. I come back to the 2nd plum cut...measure up 1-1/2 inch for the seat cut, then 3-1/2 inch cut. I finish off with cutting 3/4 inch for the ridge board...it doesn't fit!!! What am I doing wrong!!!
You are getting to technical. If you know your slope which is 3/12 , and you know your run,which is 71 5/8" you need to determine your line length.
Consider thikness of wall sheeting for the seat cut.
Don't you have to take off more then 3/4 if the slope rises above a 4?
no, just half the thickness of the ridge board. Because the line length goes to the center of the ridge
@@mhughes555 do you not cut rafters?
Your plumb cut you said 9/12, but theirs only one of those on my speed square? The 12 is on the common rafter cut!
It could either be under the hip scale or the common scale don't get those confused.
Which # do I use on a 9/12 pitch for common rafters? The 9 or the 12?
@@herbertherbomoore415 use the 9
What about those numbers underneath 15" 19.21, 20", 30".9 5/8, & 10 5/8?🤷🏾
In a 15/12 sloped roof, under the fifteen it is 19.21 in per foot run. This means that for every foot traveling horizontally the rafter is 19.21 in Long.
What about the step off method?