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re: Slab question for building a house
Posted on 10/8/15 at 7:39 pm to JamalSanders
Posted on 10/8/15 at 7:39 pm to JamalSanders
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.
Posted on 10/8/15 at 9:09 pm to tiger94gop
One builder tells me it'll add a few grand to the cost. Another recommends it and says it's cheaper than a conventional slab.
Posted on 10/15/15 at 11:54 am to tiger94gop
Concrete cracking also happens for different reasons. On commercial projects the structural engineer will provide mix design criteria which limits water-cement ratio, specifies agregates, slump, etc. Shrinkage cracking happens quite often simply because the concrete finishers go well above the state's water-cement ratio by adding water to the mix at the jobsite. They do this for 2 reasons: because it's easier for them to place the concrete and because it isn't their house.
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