We are building out a two-room suite that consists of a full bathroom (tub, sink, toilet) and a full laundry room (washer, sink).
There is one single door that enters into this two room suite.
I think it would be nice to have a threshold/linear drain right at that doorway ... the wainscoating of the tile in these rooms make them like a swimming pool, so the water can only escape at that doors threshold ...
So I am thinking of installing a linear drain that covers the full 32 inches of that doors threshold and draining it to daylight.
Just to clarify - this is not a drain that would see any use under normal circumstances - this is a safety drain in the event that something clogs or overflows or the supply line to the wash machine breaks, etc. - the flow of water is stopped at the threshold of the tile and does not do $50k of damage past that point, It seems like a good idea.
The only thing that nags is that the 2" drain to daylight is a heat sink / source of drafts ... so I was thinking of installing a very sensitive check valve, with a 1/2 PSI crack rating, at the end of this 2" pipe.
But now I have a check valve that might stick ... but I think I can live with that, since check valve malfunctions cause them to stick open, right ?
Is there, in fact, any problem with draining to daylight ?
Would it be better to put in a huge trap, fill it with water, and just refill it if I ever notice a draft ?