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Tractor Talk Discussion Forum

Is it enough

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old

03-25-2007 07:23:07




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On a hay barn roof is a 2 foot drop in 20 foot enough. Or does it need to be more like 3 foot. Reason I ask is a 2 foot drop in the 20 foot is real easy to set up but more will take about 10 times more welding to set up. This will be with metal roofing.
Thanks




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MGTPa

03-26-2007 16:59:53




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
If you will be using metal roofing the rain will run right off. We have several farm buildings with various pitch roofs, all of them standing seam metal roofs. The main barn has had standing seam metal roof (replacing the original wood shingle roof) on for over 75 years and not a single drop of water gets in. The underside of the meatl roof is just as new when it was put on. As to a metal roof sweating, if the barn or pole shed is tighly enclosed so that the building can't breathe, yep, probably will sweat.
Those huge old bank barns built years ago weren't airtight, so condensation amd dripping was a problem. Our barn was built in 1830 with wood shingle roof that lasted a hundred years when the standing seam roof replaced the shingles. Looks like the metal roof will easily last till the year 2050 or longer.

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Janicholson

03-25-2007 10:38:30




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
Check the span for support, In MO with not terrible snow, but (Ive seen your) Ice, I think I would go with 3:12. JimN



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old

03-25-2007 13:03:25




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 Re: Is it enough in reply to Janicholson, 03-25-2007 10:38:30  
Ya I'm going with a 3.5 foot on that 20 foot span. I got to messing around and found I had to weld either way so I figure why not go with the steeper roof just to be on the safe side.



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kyhayman

03-25-2007 08:58:20




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
I've got one that drops 18" in 28 feet. Built it 10 years ago and never had a problem.



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Walt Davies

03-25-2007 08:44:26




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
The book says 3 in 12 is the minimum amount of pitch for a metal roof. also remember that metal roofs sweat and this will ruin any hay left under it. you need to add some type of insulation under the roof to stop the sweating. I have a corrugated metal roof on my barn and its sweats terrible. It leaves a lot of dark mold on the hay where it drips of the ends of the sheeting. My neighbor had a pole barn put up and they put insulation under the metal roof and no sweating. If tou live in snow country I would even want more than 3 in 12 as the snow causes ice dams that make the melting snow backup under the overlap at the pitch you want it would be way to little to stop this. Personally I would prefer 8 or 10 in 12 in snow country and maybe 6 in 12 in heavy rain for a metal roof after all the idea is to keep your hay dry and free of mold. Walt

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Bill in NorthCentral PA

03-25-2007 08:11:44




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
I'd personally like more, but have seen them at 1:12 on alot of steel buildings. When I install that low, I use butyl seam tape on every sidelap. I wouldn't have endlaps if I could help it. If you do need endlaps, stagger them so there is not a point where four sheets meet.

Bill



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Matt in TN

03-25-2007 08:06:09




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
On corrugated metal, 3:12 is the recommended minimum. I've successfully gone 2:12 with no leaks. I would not go that low on a house, but a porch or barn shouldn't be a problem.

However, 2:20 WILL leak in a good rain.

There are some standing seam profiles that can be as shallow as 1/2":12, but that's not cost effective for use on a barn.



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Paul from MI

03-25-2007 07:42:16




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 Re: Is it enough in reply to old, 03-25-2007 07:23:07  
Should be OK. We have metal roofs at the plant that have a lot less fall than that. I'd check with your steel supplier to be sure. Good luck,
Paul



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