re: Slab question for building a house

We went with post-tension because its South Louisiana. I used a higher PSI concrete and an additive that made it flash faster. The finisher broke his whirly-bird and ended up with some mess ups. I have basic hairline cracks, I have a sis-in-law whose builder said the same and sometimes you can stick an 8 penny nail in the cracks. In Ascension, you would need a compaction test and an engineer for the post tension. Usually, you use a post-tension contractor. If done wrong, the slab could falter, but a good contractor will not have this issue. I am glad I did it. Between the dry conditions and the rain I have areas of subsidence in my yard, but my house is on 4 feet of river sand and post-tension. No worries.