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Old 12-10-2007, 05:24 PM
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Rick Bunzel Rick Bunzel is offline
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Weird patterns in garage floor
New home inspection garage concrete had cell like patterns with salt efflorescence on the surface. My guess is that the installer did not put plastic down before the pour but I want to run it by the Inspection New community before I report it.

Are these symptoms something the owner should be concerned about? I have inspected a lot of new construction and have never seen it this bad. What would I report?

Thanks
//Rick
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Old 12-10-2007, 05:33 PM
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Gunnar Alquist Gunnar Alquist is offline
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Re: Weird patterns in garage floor
Rick,

Looks to me like the slab cured too fast, which resulted in the "crazed" pattern. I have seen this happen when the slab is in direct sunlight on a hot day.
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Old 12-10-2007, 05:53 PM
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Re: Weird patterns in garage floor
Rick,

This was not by chance a model home was it?

I've seen homes that had been models and the garage used for an office space while their selling the homes in the neighborhood.

Once they sell out the neighborhood, sometimes I've seen them go in and put a parge type coat over the garage floor to hide surface flaws from where partition office walls have been in the model home.

If not, the concrete mix looks like it might have cured out to quickly.

Rick H.
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Old 12-10-2007, 06:21 PM
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Re: Weird patterns in garage floor
Rick,

It was a spec home that took over a year to sell. Don't think the builder made much on it.....

//Rick
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Old 12-10-2007, 06:34 PM
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Re: Weird patterns in garage floor
Rick,

If the concrete cured rapidly in direct sunlight (as Gunnar mentioned) the surface concrete may be weakened. If some of the water in the surface of the concrete evaporates rather than fully hydrating the cement that part of the concrete may not have achieved full strength. Food for thought.
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Old 12-10-2007, 07:41 PM
Jeff Euriech Jeff Euriech is offline
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Re: Weird patterns in garage floor
See following PDF on Crazing Concrete Surfaces:

http://www.prmconcrete.com/cip/CIP03p.pdf

Jeff Euriech
Peoria Arizona
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Old 12-10-2007, 08:26 PM
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Re: Weird patterns in garage floor
Jeff,

Thanks for posting that link.
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