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I am in the process of building a log home in Northern Vermont. Extremes are below zero temps, high winds, ect, and a lot of snow. My contractor is putting a metal roof on, and I have questions as to how he is installing it. The rafters are 2 by 10, 16 " on center. He nailed 1 by 8 spruce purlins over the rafters 12 " apart. He plans to screw the corrugated panels directly to the purlins. There is no osb or plywood.. Is this O.K. ? He also plans on installing the ridge vents, but will seal the gaps with insulation because of the amount of snow that will enter the vents. Typically the snow blows sideways. Is this also O.K> Please help ??
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My first advice is to track down the roofing manufacturer and obtain instructions from them.
Many metal roof profiles such as what I believe you're having installed are suitable for installation over purlin. I would assume he'll be using a screw with a neoprene washer and steel cap on top.
I am not sure what gaps he is sealing with insulation. There are profile strips which can be purchased to meet most roofing profiles.
Proper ventilation of the attic is very important. In no way should he do anything which impedes airflow out of the ridge vent.
Additionally, for the ridge vent to perform properly, you need soffit vents as well.
Good luck.
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I live in the same climate in Canada and in a timber frame home with a metal roof and I would not recommend what your contractor is doing.
The building code calls for underlayment (moisture barrier) under the roofing unless the manufactuer has tested that exact assembly otherwise. Follow Todds advise and contact the manufacturer.
If you are going to have an attic then make sure you ventilate it properly. These new profiled vent mesh strips work great against the snow. If any heated air escapes from your ceiling in the winter it will condensate under the metal and can drip. Read some of the last communications on underlayment to understand consumers with problems that you may experience.
If you are going to have a vaulted ceiling, the new codes call for a minimum 1"air space under the roof material. Again make sure you use a moisture barrier. Additionally make sure you use a miminum 6 mil air barrier to the warm in winter side and caulk all laps.
1/1/2003
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1/2/2003
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