I've striped my basement floating floor, as I want to have a epoxy/polyurea flooring installed. I've found this hole, with a plastic frame, under the floating floor. It was covered with some transparent tape and there was some kind of sealant inside the tape around the hole.
The new flooring would cover it. So, I wonder:
- what is this hole ?
- what's the purpose ?
- why was it taped and sealed ?
- anything special I must do/not do as the new flooring cover it ?
Extra information: I believe there's some sort of pressure differential, as I was feeling a very slight breeze from it (I think) with the tape removed. It was raining outside today and I believe I heard a very faint gargling noise from it (might have been coming from outside, though).
House is in Quebec, Canada, build around 2005.
Lastly, spouse is very concerned about radon gas and anything that might be a way for radon to get in or accumulate is extra concern.
The coin, for sizing, is a canadian 2$, barely larger than a quarter.