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Tractor Talk Discussion Forum

OT Metal Roofed barn insulation

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JackT

05-10-2005 16:53:07




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I"m building a barn that will have a metal roof over wood trusses. Since it won't be heated I hadn't planned on any insulation, but I've been told that I still need to insulate the roof to prevent condensation from forming on the underside of the metal. I'm building this in a very dry climate (SW Colorado). I'd appreciate all comments and insight on this.

Thanks!




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terryjd

05-11-2005 23:40:51




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 Re: OT Metal Roofed barn insulation in reply to JackT, 05-10-2005 16:53:07  
My old garage attached to my old house is tin roof, tin sides, wooden sliding doors, no insulation. Never a drop of moisture. I am in Ontario and all kinds of different weather from -40 to over 100 and high humidity. Its not real air tight so that might be why no problems.



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OK-AL

05-11-2005 19:53:55




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 Re: OT Metal Roofed barn insulation in reply to JackT, 05-10-2005 16:53:07  
Northeast Oklahoma, summertime high temps, high humidity. Shop is wood pole barn, metal siding and roof. Concrete floor. Absolutely no insulation. Never, ever any condesation. Neighbor told me about other metal buildings with moisture problems when I built mine several years ago, but i've never had any problems at all. However, it faces north, has 11' sliding doors on north and south ends that don't seal real well from the wind. Consequently, the air is exchanged often in the building. That could be the reason why no moisture problems since the wind never stops blowing here (or so it seems!!)

On the other hand, it's darn cold in there in the winter and extremely hot in the summer. The metal on the west wall is warm in the winter when the sun's out. I would insulate if for no other reason than it will make it easier to heat in the winter if you work in the building.

Good luck,

OK-AL

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Galen

05-11-2005 05:12:26




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 Re: OT Metal Roofed barn insulation in reply to JackT, 05-10-2005 16:53:07  
You don't need insulation as long as you vent properly. Use either a ridgeline/roof type vent, or vent at the eaves/gables. Where you're at, you may not need anything!



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Silver Pig

05-11-2005 04:05:01




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 Re: OT Metal Roofed barn insulation in reply to JackT, 05-10-2005 16:53:07  
My Morton building is completely uninsulated, (except for the office and bathroom), and there has never been a drop of condensation on the walls or roof here in West Central Texas.



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Mike (WA)

05-10-2005 17:16:43




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 Re: OT Metal Roofed barn insulation in reply to JackT, 05-10-2005 16:53:07  
In an unheated building, you do need something to prevent condensation, but the plastic covered yellow fiberglass insulation is overkill. There is some stuff in a roll called "Tri-Ply" that I have used with great success in that application- Its a black fiber-reinforced layer in the middle, with white plastic on each side. Thinner than tarpaper, comes in a roll. Works great- never any condensation, birds don't tear it up, etc. And of course, much cheaper than the plastic/fiberglass stuff.

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J. Schwiebert

05-10-2005 18:52:16




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 Re: OT Metal Roofed barn insulation in reply to Mike (WA), 05-10-2005 17:16:43  
You do need insulation. My neighbor and I built pole sheds in the same year. I insulated he did not. His drips all the time in the winter and spring ,mine will drip where the skylights are but that is it.



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Mike3501

05-10-2005 19:54:04




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 Re: OT Metal Roofed barn insulation in reply to J. Schwiebert, 05-10-2005 18:52:16  
Well , I built a pole barn here in Northern Colorado . No heat no insulation no condensation no drips .I think the humidity is just to dry



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txgrn

05-11-2005 06:02:33




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 Re: OT Metal Roofed barn insulation in reply to Mike3501, 05-10-2005 19:54:04  
I think you hit on it.

No moisture in the air, no moisture to condensate on cold surfaces, hence no drip. Makes sense.

I live in N. Texas at about 800ft ele. rel humidity seldom below 50%, usually more like 80. Insulate or get soaked.

Mark



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Chad Franke

05-11-2005 06:01:40




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 Re: OT Metal Roofed barn insulation in reply to Mike3501, 05-10-2005 19:54:04  
I agree with Mike, in Colorado, you won't need to do anything. Our main shop growing up was steel on trusses, barn was the same, storage sheds...never any condensation. Too dry.

Since the first of the year, my weather meter says they high humidity has been 49%. Typically runs 25-35% day to day...



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Mike w J

05-11-2005 07:35:37




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 Re: OT Metal Roofed barn insulation in reply to Chad Franke, 05-11-2005 06:01:40  
in south dakota with big temp changes we have a lester with no vents and no insulation and it can rain from the ceiling in there .on our morton with eve vents it never drips we also have a flat roof butler with roof vents and it never drips



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