Metal roof condensation up at ...: "I have a 8/12 pitch roof with metal roofing. I ..." - Guest User (7/30/2005) | Ventilation | Archive

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I have a 8/12 pitch roof with metal roofing. I used 2x12's for the rafters, insulated the 12" space and then sheet rocked the bottom of the rafters.I then put 2x6 pine tongue and groove over the sheetrock. I am getting moisture on the inside of my ceiling.The roof was installed 12 years ago and I remember that the installers placed a rubber strip across the top of the roof sheating at the ridge. The ridge cap is raised up where it crosses the vertical ridges in the roofing, but with that rubber "patch", I can't see any ventilation possible. I want to remove the ridge cap, remove the rubber patch and cut the sheating open approx 2" on the top of the ridge. If this sounds ok, then what can I use to cover the 2" gap,(to keep out insects, rodents, rain,etc, and still allow for proper ventilation? Any help will be greatly appreciated!	Guest User 7/30/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6355/find/
If you open the ridge, will you then have at least a 1" open airspace which can be vented with soffit vents as intake and the ridge as exhaust?	Todd Miller Isaiah Industries, Inc. 8/1/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6356/find/
Hello, I'm having sweating problems too! The cabin is 7 yrs.old with a metal roof. It is made of White pine and Cypress. The construction is tounge and groove, 2X4's on end 4" of styrofoam, 3/4" plywood, 2 layers of 30# fetl and the metal roof. The inside sweats so bad the wood has turned black! Is that mold? We just purchased the house 2 months ago and I'm very upset at this discovery. The house inspector did not catch it! L	Guest User 8/17/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6357/find/
Chances are that yes this is some sort of mold / mildew / wood rot. And chances are it is from lack of ventilation. Building codes require a minimum 1" vented airspace beneath the roof deck. You may need to consult with a structural engineer but your best bet may be to remove the roof panels, install vertical battens of some sort, followed by another roof deck, underlayment and roofing. The resulting airspace would then be vented with soffit and ridge vents. Other options include just trying to eliminate all moisture sources in the home but, in and of itself, I doubt that will be enough.	Todd Miller Isaiah Industries, Inc. 8/18/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6358/find/
I have a question about a new house I am building with a tin roof. The contractor did not put anything betweent he tin and the wood. Isn't there supposed to be a black sheeting in between to prevent condensation and mold growing?	Guest User 10/17/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6359/find/
Most metal roofing manufacturers do suggest (or require) a layer of underlayment in cases such as yours.	Todd Miller Isaiah Industries, Inc. 10/19/2005	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/6360/find/

Metal roof condensation up at the top of seiling.