I'm thinking about doing a corrugated tin roof -- they sell the stuff in 8 ft sheets, just right for my roof. But the plastic stuff and the ondura/asphalt stuff all has foam inserts to make screwing the stuff down easier (less likely to dent the roofing) and keep wasps from building nests in the roof. But the corrugated tin stuff doesn't come with an equivelent foam insert. The kind they do have for sale (for the plastic and ondura) doesn't fit. So what's up with that? Anybody come across this problem and have a solution? Thanks!