Brand new basement floor cracked??

[55stone]

Good evening guys, my wife, son and I are having a house built in northern Indiana, it’s super exciting and going well!! They just got started a couple weeks ago.. anyways they poured the basement floor 8 days ago. It’s been upper 70’s and 80’s since they poured. Last night and today it was in the 50’s and rained.. the basement slab now has 2 pretty good cracks in it. 1 runs from the backside wall to the front sidewall at the closest points. They did not relief cut the basement, which from some googling is 50/50 if builders do that.. I didn’t get any pictures but I sure can.. I was just wondering if this is normal or if this is pretty early for it to be cracking.. i was mainly concerned with water tightness of the basement.. I have not talked to the builder yet, wasn’t sure if I was concerned for no reason. Please let me know if you need more information..
Couple other things I thought of. It has small rock under it with vapor barrier and wire mesh. Also has a couple deeper pockets of concrete with rebar in the areas of the load bearing walls..
thank you guys for any information!!!

 

[Dagny]

Pretty normal all the cuts do is make the cracks straighter.

 

[Walkers]

All concrete will crack, unless it is a huge gap, or heaves then don’t worry about it.

 

[The Cobbler]

cracks in basement floors is common.
My circa 1950 house has had cracks int he basement as far back as I was aware of things..., and they've not changed in size since then.... more than half a century

 

[Bucko]

Old saying is there are two things about concrete.....its gray and it cracks.

I would get some detailed pictures using a coin for reference. Pick some places that are easy to find later like where the crack has a bend. Make sure to have closeups and far away. Can put a shot of paint down but it may dissappear during the build. Place the coin flat and in the crack if it will fit and then check later to see if it grew.

 

[ConCretin]

I was just wondering if this is normal or if this is pretty early for it to be cracking.. i was mainly concerned with water tightness of the basement.. I have not talked to the builder yet, wasn’t sure if I was concerned for no reason.

Cracking in new concrete slabs is usually the result of shrinkage and occurs early in the curing process so your's aren't unusual. Even if your contractor had cut control joints, you'd likely still have cracks - you just wouldn't see them.

A slab on grade in a basement really isn't waterproof to begin with considering the joint between the slab and foundation walls so that isn't a concern either. If you are depending on your walls and slabs to keep water out, you need to address it with other means such as waterproofing and drainage.

Nothing to see here folks, move along. Congrats on the new home.

 

[55stone]

Thank you for the reply. They did waterproofing and French drains around inside and outside the wall foundation.. thanks again for the reply!!

 

[FMB4]

Gee, the last time I remember seeing a relatively large concrete slab without cracks was... er ... never.
Enjoy your new house!

 

[65ranchero]

They also say" it's not if it will crack, it's when"

 

[MerlinsBeard]

Cracking in your basement slab will happen given enough time. If you feel obsessive compulsive... *cough* motivated enough to address it, you can use something like slabweld to fill the cracks and grind the excess material away. It's a low viscosity polyurea that you blend with white fine silica sand.

I bought a new house and used that for my 3 basement and 1 garage slab cracks that appeared after about 7-8 years or so. Did the repair and still looks good after 1 year. If you finish the basement, the problem also goes away, so there's that avenue as well.

I'd only be concerned if you have cracks in any cinder block walls of your basement this early on. If you put those off, those cracks can grow pretty fast.

 

[kelpaso1]

Put laminate flooring down. Will cover the cracks and be much warmer on the feet than bare concrete.