Typical for the way they construct
If you have ever seen how they build these houses and the timeline, you'd understand.
Concrete and masonry doesn't get it's "set" (curing) for 30 days. That's the chemical reaction of the lime, cement and aggregates to bond with eachother.
They put the foundations in and pour the concrete within a week or less. Construction begins shortly thereafter, before the concrete has even set for a day or so. The weight and load of the house causes the flexing and movement...thus cracks.
Equally, if the ground underneath the concrete is not sufficiently compacted, causes settling and cracks.
I would wager that almost every house in TV has cracked concrete floors and foundations caused, in part, from this shifting.
Filling the cracks is simply cosmetic and does not solve the problem, but, it's impractical to "solve" the problem unless there is significant sinking or shifting that results in structural issues, which is rare.
Cover with indoor/outdoor carpet, use a floating floor system or make sure tile is put down with membrane.
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