My client wants to install old tin on their porch ceiling. This porch roof is on the West face of the house, receiving unfiltered afternoon sun in south Mississippi. My concern is that without insulating the ceiling and venting the attic space (the rest of the house is spray foam insulation), that the metal ceiling will act as a radiant heater when heated by high attic temperatures in the summer. Any experiences or advice on this?
I think you are seeing a problem where there is no problem. Any additional minimal heat that makes its way to the metal ceiling will long be dissipated before is makes anyone uncomfortable. If makes you feel better put a thin layer of expanded polystyrene under the metal. P.