Working on the never-ending basement brewery and we have this: old piping installation holes, leading into the kitchen above.
That grey subfloor is asbestos hardiboard. We are going to eventually redo the kitchen - just not this year (priorities, man!) what would be the best way to cover this from the basement side? gut says just gluepaint to encapsulate and a piece of ply to hide the holes, sound idea?
Edit: ok cos there seems to be repeated confusion: These are holes in the CEILING of a basement brewery leading to the asbestos floored kitchen ABOVE.
Ahh, so that’s a photo looking up at the ceiling rather than down at the floor. I’d also be inclined to paint over the fibreboard to reduce and asbestos dust that may generate walking around the kitchen.
Re: Gasses, I’m familiar with keg cellars where the OHnS means keep an eye on the gas monitors as a nitrogen leak can kill you down there.