Airtighting a drain to daylight?
We are building a reasonably airtight house.
We plan to install a floor drain with the discharge set up as drain-to-daylight. I am concerned the the trap might not always have water in it, which would create an air leak.
Is there a practical way to achieve a reliable air barrier for this drain? (I am thinking of something like a spring-loaded flapper valve at the daylight end . . . )
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