Metal roofing details: Gap, air flow, and bugs
Hi. I live in Zone 4a – Nashville. I am helping my son build a small office building (storage shed). We have the roof sheathing and underlayment down. Next is 1×4 purlins and metal.
I have two questions:
1. How do you deal with that large 3/4″ gap between the metal and the roof (Bug paradise)? Not to mention the three ridges on every 3ft section of metal roofing.
2. Doesn’t the underlayment need a way to drain AND have air flow? How does that work with 1x4s running every two feet?
I am not worried about bugs getting into the vented attic as I have screen to seal the soffits and ridge from critters.
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