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metal roof condensation?
Building a log cabin with loft. Have installed metal roof on 1×4 strapping which is on top of 2×10 rafters. Slope is 1:8 . Used mainly in the summer and fall – occasional weekend in winter. How should I insulate so I don’t get condensation damaging the pine ceiling I intend to install on the under side of the rafters.
First off, condensation is formed when vapour reaches the dew point, which is its right between water/ice’s freezing and melting point. To stop this ensure you install a vapour barrier on the warm side of the insulation, no matter what kind of insulation you use. Ensure this vapour barrier is continous as any penetrations in the vapour barrier has the ability to transfer a gallon of vapour daily your humidity conitions are high.
Second, ensure you have a minimum of 2 1/2″ of ventilation running from your soffit vents (your roof overhang) to your ridge vent (yes you will need a ridge vent unless you have even a small area of horizontal ceiling at the top of your cathedral ceiling where regular roof vent will work). Just ensure that your roof rafters are large enough to provide the 2 1/2″ airspace from your insulation.
Becky’s Homestead: Log Cabin Insulation
