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Old 11-26-2008, 10:21 PM   #1
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problems with my shed....


i am building a shed in my yard , its going to be 12 x 16 . its going to have 8 ft walls and the roof is going to be a " barn style " my question is i know the angles that i want my roof joist the top angle is going to be 60 degrees and the bottom angle 70 degrees . the angle in the middle will be 140 degrees ( 2 70 degrees cuts ) if I want the center hieght to be 7 foot......what would the lengths of the roof joist be...thanks


Last edited by brack; 11-26-2008 at 11:11 PM. Reason: corrections
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Old 11-27-2008, 10:08 AM   #2
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problems with my shed....


Not sure; might buy cheap plans (<$15) similar to:
http://daveosborne.com/dave/plans/pl...mbrel-Roof.php
You should be able to get a high school geometry student to figure it out.

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Old 11-27-2008, 10:25 AM   #3
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problems with my shed....


google gambrel rafters
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Old 11-27-2008, 12:36 PM   #4
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When I built my shed, I had the the same problem. At the time, I had no source for layout instructions.
I assumed that the rafters actually formed cords of an arch.
I had plywood sheeting on hand for the roof, so I layed these out and drew a circle with the radius equal to half the span of the shed, plus the birdsmouth width.
Then using a 2X4 as a straight edge drew the rafter template on the quarter cord of the arc.
This was back in 1978, and the shed has with-stood 30 years of 50 lb. snow load, without failure!
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Old 11-27-2008, 10:52 PM   #5
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yep,take some of your potential sheathing and lay out a template for your rafters and make them all the same
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Old 11-29-2008, 08:02 AM   #6
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problems with my shed....


I may have taken the easy way out when I built mine about six years ago. I just took measurements, laid out the first one on the ground, nailed it together, and put it in place. It fit just right so I just duplicated the rest of them.

Something else I did (as an afterthought) was cut out rectangular holes on either side, just under shoulder height, so that I could insert 2" X 4"s and secure them to the studs inside. I left about 4' sticking out. That's where I store the canoe. Lazy as I am, I don't have to pick it up off the ground. Just get under it, set the yoke on my neck, and walk away.

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http://www.icanfixupmyhome.com
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Old 12-18-2008, 12:33 PM   #7
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Dude! Don't waste your time with a template and all of that other stuff, that's why we have math! Can you imagine them trying to make a template of a sky-scraper before they built it?

Post a simple diagram with your dimensions so I can get a better understanding and I'll do the math for you.
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Old 12-18-2008, 12:52 PM   #8
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problems with my shed....


farmerede:
IMO there isn't enough info in the original post to provide the answer with math. I get the feeling the OP needs what is missing so if he had a diagram, he would have the answers without posting. What is missing is how long he wants the roof segments to be and/or how high these segments are. The 7' height dimension doesn't really help without breaking it down into segments.
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Old 12-18-2008, 01:09 PM   #9
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Quote:
Originally Posted by farmerde View Post
Dude! Don't waste your time with a template and all of that other stuff, that's why we have math! Can you imagine them trying to make a template of a sky-scraper before they built it?

Post a simple diagram with your dimensions so I can get a better understanding and I'll do the math for you.
Reminds me of the mathematician who worked his constipation problem out with a pencil!
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Old 12-18-2008, 01:23 PM   #10
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"Reminds me of the mathematician who worked his constipation problem out with a pencil! "

That's too funny! Yeah there wasn't enough info, that's why I asked for a diagram, but I think this thread might be dead, I noticed it was started last month. Oh well.

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