EddieWalker
Epic Contributor
The big advantage to not sheeting a roof when doing metal is being able to spread your trusses out farther. If you use OSB or plywood, you have to have your trusses every 2 feet on center, or closer. I've never seen or heard of anybody putting sheeting on purlins. I guess it's possible, but from what I understand, sheeting goes directly on the truss.
Positive reason to having sheeting is less sound when it rains. It also gives you that second layer of protection if there is a leak on the metal. I had a client with a metal roof that the screws were failing, but the tar paper on the sheeting caught the water and carried it down to the gutters. The only reason we knew there was a leak is that it rained after I had removed the gutters and we saw the water running out under the metal.
Positive reason to having sheeting is less sound when it rains. It also gives you that second layer of protection if there is a leak on the metal. I had a client with a metal roof that the screws were failing, but the tar paper on the sheeting caught the water and carried it down to the gutters. The only reason we knew there was a leak is that it rained after I had removed the gutters and we saw the water running out under the metal.
civilian
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Another second layer that I did on my roofs was to run ice and water shield all the way up to the peak. My roof was shingle because of weak cell phone signals arounf here. Metal roofs and siding effect the signl. Jon
pmsmechanic
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On most things Eddie I agree with you. Not all but on most. This is one where I disagree. I thoroughly enjoy the sound of rain on a tin roof. It's such a welcome sound in an area of low rainfall.
OP
hayden
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I'm not quite following... With the steel building, trusses are only every 13'. Then there are 6" purlins that run between them the length of the building on 24" centers. Without sheathing, the metal roof pans attach directly to the purlins. With sheathing, the sheathing goes over the purlins, then the roof pans screw to the wood. From what I've seen this is pretty common with steel building, but my experience is very limited.