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Steel frame steel building home/ condensation issues

cruiser8840 | Posted in GBA Pro Help on

Have a steel framed steel building house.  Standing seam metal roof with cathedral t&g carsiding. I am having condensation issues. 2x4s attached to bottom of steel purlins running from ridge to eave on bottom side. 10” of insulation between purlins. Condensation only happens after cold night 25 degrees or less, and then warms up next day.  

 

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  1. creativedestruction | | #1

    https://www.buildingscience.com/documents/insights/bsi-036-complex-three-dimensional-air-flow-networks

    You need an air barrier on the interior side of the assembly. T&G carsiding isn't up to the task. The steel purlins are thermal bridges; they will nearly always cause condensation unless the are insulated on the exterior.

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