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Tool Talk Discussion Forum

Insulating metal roofs?

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Truck

11-15-2005 05:23:37




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Still in the planning stage for repairing this ole gas station I live in. The back two rooms did not have a lot of headroom, and The main section of the house is roofed with the standing seam steel common a hundred years ago, with no provision for venting. Currently the main section of the house is standing and only the foundation for the back rooms remains. I had to tear the rotted roof and floors out and the walls weren"t real good so they left as well.

I was reading somewhere that one could lay down foam insulation on the roof deck before installing the steel...Would this be a decent way to insulate the roof on my back rooms?(I"m near ALbany, NY in hill country and we have fairly bad winters here on top of the hill.. Ski areas are only a few minutes away if that helps describe the climate.

Picture a hip roof building 18 by 28, with a shed roof addition of 9 by 28 on the back. With enough pitch to the shed roof to drain, the ceiling will end up being slanted to provide enough headroom at the back wall...No room for the usual fiberglass and nowhere to vent to keep the roof cold and ice dams down. Currently the attic has two layers of fiberglass but still melts off snow quickly and creates ice dams over the main section of the house..Lots of icicles sure are pretty but they arent the best thing in the world for the roof or people walking by. Any thoughts, besides calling the home makeover folks with their bulldozers?

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Bill in NorthCentral Pa

11-16-2005 07:42:52




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 Re: Insulating metal roofs? in reply to Truck, 11-15-2005 05:23:37  
There are several schools of thought. The main two are provide airflow to dry possible condensation and the other is to insulate full to prevent condensation (like in a mobile home.)

I would investigate two ideas. 1. 2x4 with 1.5" rigid insulation, either standing seam or screw down with tape mastic at edge and end overlaps. 2. Standing seam with rigid insulation between the clips. "They" make taller clips to allow for rigid insulation of various thicknesses.

Note on SS roof. True standing seam is a lost art. Fortunately, the manufacturers have modernized this to a fairly simple yet good system. For your location, I would check out VicWest steel in the Wilkes-Barre area. Outstanding product, great service, fair price (not free, but fair).

Let me know if I can help with any other questions. I know enough to be dangerous - and know when I'm wrong.

Good Luck,

Bill

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steveTinNY

11-15-2005 16:19:34




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 Re: Insulating metal roofs? in reply to Truck, 11-15-2005 05:23:37  
truck,
where are you near albany,
I am in Altamont and am restoring a farmhouse in Montgomery County/Town of Florida...
just curious.
You puting the new roof on yourself or hiring someone to do it? Good standing seam people in this area are tough to come by...



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joe from ny

11-16-2005 05:01:56




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 Re: Insulating metal roofs? in reply to steveTinNY, 11-15-2005 16:19:34  
I'm going through almost the same engineering process you are. Southern tier between Binghamton & Elmira. Lot's of standing seam going on now, especially fast food places. Have heard all kinds of stories about foam under the steel too. But nothing concrete. Farm show in Syracuse at the fair grounds, February I think. There will be dealers there. One guy gave me a quote and was going to use 2x4 stringers and drop foam between the stringers. Too many choices. Joe in Chemung

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Truck

11-16-2005 04:39:47




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 Re: Insulating metal roofs? in reply to steveTinNY, 11-15-2005 16:19:34  
I'm in Stephentown....about an hour away from ya. I was planning on using the modern steel for the two room addition, unless I can find the materials to do real standing seam somewhere. I do know for sure there will be no more roll roofing on this house!
Yes, I am a do it yourselfer.



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Mike M

11-15-2005 06:37:26




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 Re: Insulating metal roofs? in reply to Truck, 11-15-2005 05:23:37  
Check into the spray in foam type.



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Truck

11-15-2005 13:13:37




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 Re: Insulating metal roofs? in reply to Mike M, 11-15-2005 06:37:26  
I thought spray in foam was illegal somehow because of the fumes produced while curing or if burned...At least I have a remodeling book here that says it was illegal....but no references to back it up. ?????



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Richlizzy

11-15-2005 15:37:54




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 Re: Insulating metal roofs? in reply to Truck, 11-15-2005 13:13:37  
Sprayed in place polyurethane foam is still available. My brother is in the business. You maybe thinking of the old urea-formaldehyde (bad stuff). The new formulas for the poly foam are even friendly to the enviroment. Do a Yahoo or Google search. Sounds just the answer to your problem



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Truck

11-16-2005 04:42:41




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 Re: Insulating metal roofs? in reply to Richlizzy, 11-15-2005 15:37:54  
So I should have the foam sprayed in between the rafters in both the main section of the house and in the new section I am rebuilding? Should I do anything to vent the roof areas or should I leave it unvented? I do not plan on replacing the main standing seam roof as it still has plenty of life left.

Thanks for the info guys!



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