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Planning to replace the flooring in kitchen

I was planning to replace the flooring in my kitchen, which is on the first floor. But, I found a crack in the subfloor and I am pretty concerned about it. I researched this online and came to know that these hairline cracks are normal as the concrete shrinks when it dries. I was not able to find any hairline cracks.

The floor on either side of the crack is flat, but it does stretch all the way across the room. These cracks are about 3mm long. There are no other cracks.

This house is about 23 years old, consists of 3 stories. An earthquake happened here 5 years back. I guess this crack might have formed from that earthquake. Is the crack a cause for concern? My husband suggested having a crack repair service and getting this sealed. Thanks for any advice you can give.