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New metal roof and new heating system

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Sharon Michelle
12/11/2009
We recently had our metal roof replaced, and then a few weeks later we had a new heating system put in. The heating system is electric forced air - before we just used a wood stove and space heaters. We've lived here 7 yrs., and have never had condensation problems. Now, on a sunny cold day, the roof is dripping all over the living room and kitchen. The living room and kitchen have a "false" ceiling (raised), with no attic. The rest of the house has an attic. So, my question is, why are we suddenly having these condensation drips? Would running the ceiling fan (in living room/kitchen) help by moving air? Should we assume there is dripping up in the attic over the rest of the house? How do we stop it?? Any help would be greatly appreciated.
Todd Miller
Isaiah Industries, Inc.
12/11/2009
The ceiling fan may help. However, condensation results when warm moisture laden air reaches a cool surface. Keys to help stop it are vapor barriers, ventilation and insulation. Call me at my office if you like ... 1-800-543-8938 ext 201 ... or I also suggest contacting the manufacturer of your roofing.
Guest User
12/13/2009
I gave your number to my husband and he will hopefully call you tomorrow. For more information, the ceiling is insulated between the rafters with 4 inch rigid foam insulation. The contractor put the metal roof directly on the vapor barrier, which is on top of 1x6 decking. Also I believe he put the vapor barrier down with staples and the manufacturer requires nails. Is this the right way to install it or should the metal have been installed up on 1x strapping to allow air flow?
Guest User
12/13/2009
Actually, is underlayment and the vapor barrier the same thing?
Todd Miller
Isaiah Industries, Inc.
12/19/2009
No, they are not. Underlayment is beneath the roofing and is a moisture barrier. Vapor barrier is typically behind the ceilings.
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