TOPIC: I Have An Existing Metal Roof and Have A Question
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This is a transition roof that has very little pitch. There is no offset cleat. The bottom ends of the panels just have sealant to keep the water out. In fact there is sealant all over this metal roof that will need to be maintained. Once sealant disolves in the Texas heat water will run up these panels.
There are numerous places that allow water to run behind or up seams to be trapped behind the metal. My roofer says its OK for water to be under the metal panel, as long as it does not leak inside. He says since Texas has no licensing requirements for roofing, so he believes there is no industry standard, so he can install any way he wishes (very sloppy, incorrect install all around).
Is it OK for water to be trapped under metal roof? Should these panels have an offset cleat?
These are always tough situations. Water truly trapped behind any roof covering will eventually rot the underlayment and be a problem. Yes, industry best practices for standing seam will have a cleated starter of some sort. There often will be some sealant visible but it should not be the sole line of water defense. Metal roofing manufacturers generally have installation instructions. Also, Metal Construction Association offers a best practices guide to metal roof installation.
Thank you Todd. I'll check out the Metal Construction Association as well.
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