Cracks in concrete floor

[skeg]

Replacing old vinyl and found some hairline cracks in the concrete floor. The house was built in 1964. the floor isn't damp and there are no corresponding cracks in the brickwork. Is this anything to worry about or is this normal for a 46 year old house?
A big thanks to anyone who replies!

 

[PrenticeBoyofDerry]

How big are the cracks and are they in any kind of pattern?

 

[skeg]

Hi, it's basicaly a 'rizzla thick crack', making a rectangle 3m by 5m in the corner of the floor. this has two other cracks running from it. One inside this rectangle making it almost square and one offset in the opposite direction to the other side of the house.
Hope that makes some sense !

 

[PrenticeBoyofDerry]

How big is the floor space?
When you say rizzla thick are we talking opened up or the thickness of the paper?

 

[^woody^]

If the floor is reasonably level, then cracks are not a probelm

 

[PrenticeBoyofDerry]

Can you upload pictures?
sounds like it could be a sub-base problem.

 

[skeg]

'Rizzla thick', thats the thickness of a rizzla paper, if it was the thickness of an opened pack of rizzlas, I'd be a little more concerned!
Can't download any pictures as its now covered in new vinyl.
Cheers for the replies.

 

[PrenticeBoyofDerry]

If it's hairline cracks and nothing more substantial, could just be surface shrinkage and no great concern.