Plumbing vault in concrete floor
I'm about a year and a half into a mid-century, two story ranch home. It's been really great having this forum as a resource.
In this episode, I'm replacing some very well worn 1979 red shag carpet in the basement, and laying down a floating laminate floor.
I discovered a plumbing vault in the concrete floor, and after some research, learned that it's for a backflow valve that has a manual gate as an emergency feature in the event of a long-term backflow event. However unlikely that may be. This valve was installed after the fact , so the masonry work leaves something to be desired.
My question starts with, what should I be considering when I cover this thing up?
The vault was lined with aluminum foil... is that a thing? Should I replace that? My current plan is to line it with plastic, to protect the valve and it's parts, and use some expanding foam to fill the voids around the vault cover. Should I then do away with the plastic liner, or keep it as a moisture barrier thingy?
Then, once I've leveled the vault cap and prepped it to lay floor over... How easy should I try to make accessing that valve? I assume that if I were to have such a serious backflow event, that floor would be toast in any case, so it's not the end of the world if I had to tear it up to get at the valve, but perhaps some consideration needs be made. At least so's I don't forget that the thing is even there. 'Cause I will. I'll bet the last owner never even knew it was there in the first place.
Thanks for being there. And if you're interested, I'll be posting in a couple weeks about my experience with that "dimple-mat" product called Delta-FL.