Home Construction Best answer on the web

I just had a standing seam metal roof installed on my house. My builder is concerned that it may not be ventilated properly. He believes there should be an air gap between my tongue in groove vaulted ceiling and the metal. He claims that an air gap is needed to provide proper ventilation for any moisture to escape, due to condensation on the underside of the metal. Is this necessary?

I work in the Home Improvement industry. I deal with ASC, Genesys (Formerly Vic West) and Metal Sales Steel Roofing on a daily basis. I cannot think of any reason why you should have an air gap between the sheathing (your t&g roof deck) and steel roofing. If you had your contractor put steel roofing over your existing 3-tab roofing, you would of course have some sort of skip sheathing (1x4's) anchored to the 3-tab. Now, when talking to my customers about insulation, an entirely differnet subject, you need a 1-2 inch air gap between your insulation and your T&G. This you cannot do with your application since you actually see the underside of your roof decking. I do not believe that you will have any problem with condensation with your home.

There is a pretty good answer to your question in this previous question:

http://answers.google.com/answers/threadview?id=456334

I hope that you at least have 30# felt installed under your metal roof. I looked at several standing seam manufacturers websites and could find none that recommended an "air gap". The general consensus seems to favor a breathable membrane for best protection from condensation.

I am not a researcher, but have many years in the building trades. There are a variety of questions here: Is there a 'felt paper type membrane' put down between the metal roof and the plywood or OSB sheathing? Did the builder install ridge venting? Have you considered checking in with the manufacturer's website tech help? Has his builder done this type or roof before? Did he let you know of his concerns prior to starting the project or once it was under way? Were you acting as the general contractor or was the builder totally in charge?
Best of luck to you.

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Home Construction Best answer on the web