>If the crack is active then you have something to worry about. Put a piece of tape across the crack and cut it along the crack. Check back and see if the tape has opened up. Also mark the ends to see if it is growing in length<
Thanks for the info...It's been there for as long as I can remember, probably as long as I've owned the home (about 10 yrs). I never really thought much about it until now as they are installing a new furnace next week and running a liner for the water heater..I don't think it's growing but I'll try the tape trick after the new furnace is installed...thats a good idea...Thanks again..