Beltzington
Platinum Member
I am amazed, not really, on the disagreement amongst installers on the best way to install metal roofing panels on top of sheathing. So what does TBN folks have to say. Existing construction not changing so not allot of value in this thread to discuss why it is better to not use sheathing under metal roofs in the first place.
1/2" ZIP OSB sheathing, metal panel approved 1st layer moisture barrier.
I was going to just screw the panels to the roof, hitting the 24" OC rafters if needed, however this method seems to cause a great amount of gas buildup if you google on the internet. Their preferred solution is to screw 1x4" strips to the sheathing to keep the metal off the roof which they believe will prevent moisture damage from condensation. Thinking this through, a problem of mine, any condensation will still end up on the sheathing so I do not see how this is a solution any better or worse than screwing it directly to the sheathing. Actual experience greatly appreciated, opinions will be tolerated.
1/2" ZIP OSB sheathing, metal panel approved 1st layer moisture barrier.
I was going to just screw the panels to the roof, hitting the 24" OC rafters if needed, however this method seems to cause a great amount of gas buildup if you google on the internet. Their preferred solution is to screw 1x4" strips to the sheathing to keep the metal off the roof which they believe will prevent moisture damage from condensation. Thinking this through, a problem of mine, any condensation will still end up on the sheathing so I do not see how this is a solution any better or worse than screwing it directly to the sheathing. Actual experience greatly appreciated, opinions will be tolerated.