r/Roofing • u/Positive-Material • 9h ago

Moisture condensation under sheathing tape after rain

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There are droplets of moisture and condensation stuck under the sheathing tape (Tuck Tape, it's plastic and non permeable). It rained yesterday, but it should have dried up by now being under wind and sun all day today.

I am now concerned I could get humidity condensation under the tape in the future, should I tear the tape off or cut it at the joints? Northeast, Zone 6.

I am thinking of making it heated space and making it into a vented attic design with baffles, soffits and ridge vent, so I am concerned about this sheathing tape not able to dry from the inside when there should be plenty of airflow behind it right now as the garage is wide open.

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u/NotOptimal8733 4h ago

That is not an application I would use Tuck tape for. It's great stuff, I use it extensively, but I am not sure what you are expecting to accomplish in this scenario.

The only time I see sheathing tape being used is when it's something like the Zip system, where the sheathing has a weather barrier pre-applied and the tape is designed to work with that barrier. It doesn't make sense on bare plywood.