Posted by George Marsh on August 27, 2014 at 11:32:43 from (50.121.114.103):
In Reply to: Barn roofing posted by Dave H (MI) on August 26, 2014 at 15:14:19:
Dave, It sounds like you have already made up your mind and are going with metal.
Well I thought about you when I picked up a 5 gallon bucket that was upside on the ground for a few days. We've have dew points in the 70's and night time temps below dew point. Inside the bucket were drops of water, condenstation.
So if you are going with metal, I would recommend trusses on 2 ft for snow load. OSB instead of perlins. That way if you do change your mind, all you will have to do is remove the metal and nail shingles. Locally a roofer is advertising on TV a 100 year metal shingles that look like regular designer shingle.
In my younger days, I had an all metal shed. That's when I learned to hate metal roofs. The condensation inside shed, everything rusted, wasps would find their way in the shed because the roof had bends in it.
I looked at many pole barns before I decided I wanted to put an end to condensation, not by using a plastic or foam barrier that birds could carry away. I also noticed that all the metal pole barns have no overhangs. I wanted a 1 ft vented overhang, no rain gutters that I would have to clean, and most importantly, I didn't want rain dripping from gutters on siding creating green mold. I also wanted light panels installed under eve so the pole barn wasn't a dark cave.
So if you are going to put metal over OBS, I would strongly recommend putting something between metal and OSB and making vented eves. I even have a vented ridge, along with a 1500 cubic ft/ min power vent. I have yet to have rust or condensation. Even park a snow covered truck in pole barn in winter, no condensation. No floor drains either, don't need them. Snow melts and drys up on it's own. My barn isn't insulated or heated. Just used to keep things out of the rain. George
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