Crack in slab and leak along fireplace (photos) - how bad?

[Ludmila M.]

In your opinion, how bad and expensive are these two problems:

1. Crack in a slab foundation.

2. Water leak behind the wall that surrounds fireplace. Water stains are visible along this wall from the ceiling (two-story room) all the way down to the floor, with corresponding floor damage.

The house was built in 1994. 

[Sorry some of the photos are sideways, I can't figure out how to rotate them.]

Thank you!

[Account Closed]

Start in the attic and check out what's visible up there... it's possible the water just continued on the path of least resistance and worked it's way to the slab and then out underneath the wall plates, without causing any damage along the way.  What's largely at risk is the framing, insulation and drywall.  And since it appears to be a vertical problem and not a horizontal one, the extent of areas affected should be quite narrow.

If you're concerned, then you might have to cut in several inspection holes in the drywall to check.