Should I worry about hairline cracks in the concrete ?

Hi Michael :)

It’s fact that many houses develop cracks after they’re built. Most times, these cracks are referred to as nonstructural settlement cracks, but there can be a wide variety of reasons why a foundation cracks. Cracks can occur due to settlement of the building, concrete shrinkage and curing, stress and vibrations caused by trains and trucks traveling nearby, and bad construction methods.

Settlement Cracks ~ Settlement happens when part of a house drops below the height where it was placed during the original construction. These cracks can be defined by the following:

If on the wall, the crack will be vertical, not horizontal.

The crack’s width will be small, typically between 1/16-inch and 1/8-inch.

The crack will not extend past the foundation into the structure.

Shrinkage or Curing~ A poured concrete foundation may contain small cracks because concrete shrinks as it cures. The shrinkage tends to pull the concrete apart. Sharp corners at windows and doors are the areas where cracks often begin.

Hope this helps.

its in the realm of normal.....but do keep an eye on them, if the floor buckled up or sank then you need repairs fo sure.

Could be settling.

my home builder told me it is normal to see hairline cracks. Cracks that you can drop a coin into (like a coin slot) may be a cause for attention.

thanks everyone for the helpful answers !!!

I wouldn't worry much, as long as no water is seeping in. They do have some good quality epoxy floor paints on the market now that should hide them.