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I love how people take this vapor barrier stuff to the edge of infinity. I remember when I took my contractor license test... 18 inch overlap doesn't even require sealing with tape. If your concrete, or subfloor, or really any space is putting out enough moisture vapor to get past a simple overlap of poly then you have a much more serious problem than ...


I had a client's weekend home completely freeze with pex lines we installed. Nothing broke. Unfaced batt insulation is the fastest, cheapest stuff. Use Ecobatt if you can find it, you can sleep in that stuff, no itching or irritation.


You are correct: this is a situation where you want no vapor barrier at all, not even the insulation. However, your better bet may working with the plumbing, so you don't need a heater, don't pay for that electricity, and don't need to worry about power outages. I assume when you said "rubber pipes" you meant plastic like PEX, but even then you face the ...


You are correct. The field of building science is gradually moving away from friendliness toward vapor barriers in exterior walls, and you certainly should not put one in an interior wall or floor. Not a great idea. In addition, it would make more sense to use batt or spray foam insulation between the floor joists as opposed to cutting rigid foam to fit in ...

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