I have an Uba Tuba granite kitchen island and I have just noticed a hairline crack
of about 8 inches running from the outside edge in the middle inward to the center.
Should I be concerned?
What, if anything, should I do?
Randy, I'd have your installer determine if actually a crack
in the granite, or just a fissure. Fissures are normal features in granite, but are weak spots that can crack more easily.
Hard to say now how a crack may have occurred at this point. Possibly the slab cracked during install, or sometime afterward, or that crack may have been there even prior to installation, but was overlooked since fissures and cracks can look alike.
Probably nothing to get to bent about. You'd rather not have it, of course, but hairline granite cracks rarely get worse
or cause any problems.
Just have a pro take a look. A little extra support or epoxy may sufficiently stabilize the area. Also, you can learn a bunch more on this Reparing granite countertop cracks page