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.
Your original solution of some glue and a piece of plywood seems like a fine solution, and honestly overkill imo. I'm open to being told I'm wrong, but the impression I get is that asbestos is completely safe as long as you don't fuck with it. It becomes a problem when you start ripping it out and the particles start floating around in the air. And I've never heard of anyone getting cancer from eating asbestos - just lung cancer from breathing it. If you are worried about it getting in the beer, you should be more worried about breathing it while you are down there.
...we are.
Please do not mistake a casual tone for a lecture opportunity.