Tin Roof Sweat?

house bldr

I am getting ready to put tin on a sun room roof {rafter and perlins}it will be insulated inside with fiberglass batts directly in the rafters{no air space}can anyone tell me if condensation on the bottom side of the tin will be a concern,as I have seen uninsulated tin sweat underneath in the mornings when the sun hits it. What if anything would you recomend I put under it and would it be a problem creating a double vapor barrier.{with the fiberglass barrier inside}.Thanks for any advice!

joasis

Short answer: No, we do this all the time and I install metal roofs on new construction homes with no adverse problems.

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Bradracer18

I was wondering the same thing........for our building.....but, we've got a tin roof......and will have the insulation blown in(sitting on top of the ceiling so to speak)......so will the condensation hurt me any, if so.....what to fix it with???

joasis

If the space above the ceiling has ventilation, you are ok. On new homes, I roll insulation over the purlins, lay metal over, and still insulate the ceiling. The real benifit to doing this is in the summer.

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