I may use cement to fill some deep holes. I read that it cures in 30 days and will gas off for 30 days. This may however mean after a few hours it will mostly be cured and then it will gas off an unnoticeable amount but Im not sure.

I need to pick an appropriate product as I am sensitive to smells and vocs.

Regardless of whether it takes 30 days to fully dry/gas off, how long would you say before the smell from cement becomes unnoticeable?


  • Don’t use cement, just make appropriate covers. Aluminium works well and is accepted by some fire depts in some locations. No drying time either... just skill with a saw.
    – Solar Mike
    Jun 21, 2020 at 18:19
  • @SolarMike you mean just cover the area with aluminium sheet and tape it down? Thats a good idea certainly resolves the voc issues however it is not aesthetically pleasing and would not be as sturdy if it were taped down. Jun 21, 2020 at 18:31
  • So what is the difference between “tape” and “tape”?
    – Solar Mike
    Jun 21, 2020 at 18:41
  • @SolarMike - I think James means "If it is taped down, it would not be as sturdy".
    – IronEagle
    Jun 21, 2020 at 18:49
  • 2
    What kind of "deep holes" are you trying to fill? Where are they located? What are they holes in? How deep? If you provide that kind of info, you may get a variety of solutions that you hadn't thought of that may come without odor and be aesthetically pleasing and meet code (if you indicate where in the world you are), all at once.
    – FreeMan
    Jun 21, 2020 at 19:12

1 Answer 1


I have never heard of concrete "off gassing". It takes 28 days to reach is major compressive strength and to loose most of its moisture when curing properly, but the only thing I have ever know concrete to give of is moisture, lots of it, since water is one of the main components.

I have never noticed concrete/cement to have an odor that was a VOC concern. The materials that make up concrete are lime based or naturally occurring products. It has been around for centuries. I think the Roman Empire used concrete in some of their work. Seriously, I just found this out just a few years ago myself.

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