Cracks in Concrete Floor

[LennyM1984]

I have pulled up an old carpet ready for a solid wood floor to go down and in the concrete slab under the carpet there is an area where it has cracked.

The crack is not large (1-2mm wide at most) and so I am wondering whether I need to fill it before fitting the new floor or whether I can just leave it. Obviously it won't be visible and it won't be exposed to water etc so from a purely functional point of view I am wondering whether leaving them will create any issues.

Thanks in advance!

ETA: The wooden floor going down is solid but floating and so nothing will be glued to the slab

Edited by LennyM1984 on Tuesday 22 April 09:54

[TA14]

Clean the crack out the best you can and fill with an epoxy filler, something like https://www.promain.co.uk/centrecoat-crack-filler....

[OldPal]

Best to post pics but sounds like it would be fine to leave

If you want to fill it then something like would do : https://floormart.co.uk/f-ball-stopgap-400-rapid-r...