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To: nasdaqian who wrote (50656)	5/17/2000 3:05:00 PM
From: Gauguin	Read Replies (1) \| Respond to of 71178

"....is it normal for concrete to develop a twenty foot long, .10 inch wide crack...." Oh yah. It happens all the time. No one uses concrete anymore. You got a mis-pour, or screwed, or improper expansion joint layout, or improper grade preparation. Get an expert opinion from someone who didn't do it. On replacement, damages, tolerance, whatever; all dependent on the crucialness of the function and location. A City (or most contractors) would have it torn out. And replaced, for free. And would be pissed at the shits who did it. Depending, you can also have some glue put in it.

To: nasdaqian who wrote (50656)	5/17/2000 3:09:00 PM
From: haqihana	Read Replies (1) \| Respond to of 71178

Bruce, I don't know where you are from so, can not know what kind of soil, and sub-soil you have in your location. Here in SE Texas, we have, what is called, black gumbo. Since the early 50s, the trend has been to build floating concrete slabs. That is, of course, a misnomer because when the usually moist soil gets very dry, it seems to shrink and, where it shrinks, and sinks, the most and the fastest, the slab tilts that way and cracks. These types of slabs are used by many contractors in developments, and subdivisions, as an acceptable, and lower cost, alternative. The solution to this, which was done for me on a house I had built in the early 60s, was to drill 30" piers down to hard clay(there is no bedrock) pour steel reinforced concrete in them and tie these piers, with steel bars, into a steel reinforced slab. In the 10 years I owned that house, the slab never shifted, or cracked a fraction of an inch. Since I had poured terazzo floors in part of it, that was a blessing. I doubt if I answered your questions adequately but, all I can do is share my experiences. ~haqi~