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TOPIC: Roofing over existing roof

New metal roof over existing barn metal roof?

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I purchased a cabin in the mountains of Colorado 10,000 ft. elevation - it is an old warehouse with an old barn metal roof. The roof consists of 2 x 6 trusses 4 ft o.c. with 2 x 4 (runners) approximately 4 ft. o.c., with no plywood or decking material. I would like to put a new metal roof over the existing barn roof. I have been told by one contractor that I can't do that without having moisture problems due to "vapor lock" - is this true? Is it advisable to put metal over metal?
Guest User

10/16/2004
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First of all, if this is to be used for a living space, I would suggest forming an attic, insulating on top of the ceilings, and ventilating the attic. I would also suggest removing the roofing and applying decking followed by new roofing. Installing metal over metal can be done though I would generally suggest spacer purlins between the two with a vented airspace. It is really critical that you contact and work with the manufacturer of your new roofing to make certain that you are within their installation recommendations.
Guest User

10/17/2004
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