Metal direct over open rafters.
What everyone pictures when they hear “metal roof.” Pole-barn assembly: panel screwed straight to purlins, no solid deck, no underlayment, attic open to the panel. Rain hits the panel and the assembly resonates like a drumhead.
- Open rafter cavity (no insulation between panel + ear)
- No solid wood deck behind the panel
- No underlayment to dampen + secondary-water



