Cause of water within an unconditioned space?
I have a situation in an existing building where water is building up on the underside of an exterior steel pan/concrete tread stair. The space below is an enclosed, unconditioned storage room. I’m assuming the water is from condensation due to the temperature differential between the exterior and interior surfaces.
I’m thinking of insulating the underside of the stair but want to confirm this is the best solution. Or, are there other ideas, such as vapor retardant paint which could work as well.
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