Anyone else a tightass?

[Homeslice]

Originally Posted by Cutty72

It's called "in floor heating" and can be done either with hot water or electric.

My parents have it in both the basement and the upstairs (split level house) as well as in the garage.
It is awesome, and I will never pour concrete for a building without it ever again.

How many lines per sq ft are laid down under the concrete? And is there risk of cracking due to thermal differences between those lines?