I noticed the following thin cracks after we got all this cold weather. House was built in September 2023. The cracks extend across my back porch near the middle and then do the same on my front porch near the middle. They don't appear to be continuous cracks, so they break up and then continue later. The back porch crack runs vertically down part of the foundation wall. There's also a crack like this in one area of my garage floor. The cracks are thin. I cannot fit the edge of a dime in them.

Garage floor:


Front porch:



Back porch:

surgeag said:

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Totally normal. But if you're like me you'll check them daily for the rest of your life

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Preach!

surgeag said:

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Totally normal. But if you're like me you'll check them daily for the rest of your life

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Oh I'm definitely like you, maybe worse.

The odd thing to me with these porch cracks is that they are both near the middle of the house, so I got extra worried that they're related and could span the full length of the house from front to back.

Dis me. I drive my wife crazy when I say every other day that there is a new crack somewhere.

Whereever the foundation supporting soil dries out the least or stays wet the most
is where the pressure upwards is the greatest. Ergo center of slab or middle of exterior perimeter (as you describe) are the typical tension spots that exhibit concrete's weakness (its strength is compression).
Even during concrete curing when new, such cracks may exhibit & thus called "temperature cracks"/other.

These photos depict SOP cracks in all of Aggieland & also in highly volatile clay supporting soils areas.

You may have 10 years to watch, then do something about it if they open up, expose tensile-resisting steel to rust/failure = suing builder with structural engineer report in hand.
Such drama happens once in a blue moon, even in Aggieland and .... after expenses, you'll not have enough to completely pay for a jack-em-up, temporary (2-forever years) fix.
These photos strongly suggest you are good to go, no legal in your near future.

I understand not many can afford a structural engineer foundation design/plan/inspections when building new and so we roll the dice ala most spec.house builders must do to compete in biz. Those that do have a sounding board for such concerns/monitoring and even (if come cases) free consultation/inspections for a fix/solution of failures (usually caused by invading water & not engineering faults).

Seems I went over my ten-words-or-less New Year's resolution ... again. (Sigh)

Should there be some type of repair done for these type of cracks?

1. doing nothing is SOP
2. the very fastidious will keep them clean when "open" so when they seasonally "close" there's no "wedges" exacerbating the superficial appearances of concern
3. out in right field: an engineer once researched fluids that might keep particles at bay when "open" then squeeze out when "closing" but have lost track of all that

1. Epoxy coat over the garage floor.
2. Epoxy or tile over your patios.
3. Never notice cracks until you have an actual problem.

OP………take a look the next time you're in a home or business that has concrete floors. You're going to see those types of cracks all over. Especially if the slab was poured during hot weather.

Expoy - interesting!
Assuming 150sf to be minimum, can you share the range of costs/sf in Aggieland/other venue?
Years of warranty?

tgivaughn said:

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Expoy - interesting!
Assuming 150sf to be minimum, can you share the range of costs/sf in Aggieland/other venue?
Years of warranty?

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I'm not in Aggieland anymore and haven't had it done (yet) myself. I just know I like how those turn out.

I know y'all said these are no big deal, but I noticed similar cracks on each side of my house. The below are on the left and right sides near the middle. So basically all four sides of my foundation have these cracks near the middle of each side. Does this change anything?

Temperature cracks is the term, not even Seasonal cracks ...
must have been a stressful Build experience to be overly concerned
and I know what that's like
No worries here
Sooo what's the sad story building ... on other fronts that created all this?

Those cracks aren't in the slab, they are in the underpinning (aka parging) skim coat of mortar used to dress up the unfinished sides of the foundation.

I think the old joke was that there are two kinds of concrete:
1. Concrete that has cracked.
2. Concrete that is going to crack.

I bet your builder is loving you right about now OP.