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Tool Talk Discussion Forum

Barn Roof

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Carol Martin

01-23-2004 11:40:36




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Hi I built a 30X50 Barn a few years ago. This was built from Salvage Insulated Steel door pieces. The roof panels are 1 1/2 Thick by 5' X 2 1/2' I trimmed the metal back 2" on the long edge and 3" on the ends only on one side so that they would overlap. I was sure that I would never have any leakage problems ( I used silicone on the end seams.) I have tried fibre coating all the seams but still get (random) leaking. I have finally decided that I will put a metal Roof over this..I am wondering if I need to put Purlins on top of the flat roof or can I just go right over the Fibre coated metal roof that is there now. I am thinking maybe it would cause a Mositure problem between the two layers due to condensation. Any Ideas would be appreciated..

Carol

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Jared in VT

01-25-2004 17:13:30




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 Re: Barn Roof in reply to Carol Martin, 01-23-2004 11:40:36  
Carol, capillary action chases water all over tin roof's. You are on the right track; apply strapping directly to the exhisting roof, and apply the new tin roof product to this strapping. It will insure a uniform surface application and a sure purchase for your roofing screws. Have fun. Jared



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costman

01-24-2004 12:05:16




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 Re: Barn Roof in reply to Carol Martin, 01-23-2004 11:40:36  
My feeling is that you dont need purlins if using the manufactured roofing with overlapping ridges, where you nail through the ridges. In fact if you use wood purlins directly on the existing surface - I cant picture just how flat this is - you could actually block any possible moisture from running away. Air movement under the ridges, though slight, will be enough to dry out any condensation. This type of roofing does move in the sun and cold - which is why I rejected it for a house converted from a barn but used it on an adjacent shed -, the main thing is to use correct nails with washers and nail in center of ridges.

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big man

01-24-2004 00:06:20




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 Re: Barn Roof in reply to Carol Martin, 01-23-2004 11:40:36  
a metal roof has to breathe so it wouldn't be a bad idea to strip the old roof with 1 inch boards spaced about two feet on center then fasten new roof to this to allow for some air circulation. tha tarpaper under the lathe is also a good idea to help seal up the holes from the screws



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old

01-23-2004 19:53:07




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 Re: Barn Roof in reply to Carol Martin, 01-23-2004 11:40:36  
You might put tar paper down first



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