Concrete floor

The size of the crack would help and would how long it has been there and have there been any changes in the last year?

I think I would want to make sure it is not changing before trying to f ix it. It appears it has opened up from a hairline to a ½ inch in two years. If you "fix" it now and it opens to ¾ inch in another year, your fix will not have been a fix. I wonder what is going on that is just now 20 years after it was put in.

Here is a link someone else found. Looks like good basic information. However I am not all that sure you should work on it unit you know it is stable.

I had some small cracks like this in my laundry room which I filled with a special gray-colored concrete caulk I found at Home Depot. It made them hardly noticeable and hasn't shown any signs of cracking/failure.

dv

I think that caulk is made by Quickcrete and comes in tubes and buckets. I believe it has a little flexibility which helps. check their website.

cracking/failure.