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PostPosted: Tue Jul 17, 2018 10:08 pm 
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Builder took walls out and concreted the floor but now cracking.

They put the concrete down last week and a flooring person came today to DPM it to get ready for laying a LVT.

The flooring guys had said to get a dehumidifier to help remove the moist and speed up drying.

Today they came and part of the new concrete floor cracked/crumbled and couldn't put the dpm on.

The builder that laid the concrete seems to be only the area that cracked, the rest of it seems more solid. How do we know if rest is ok or do we take his word for it? The builder said he will lay a latex thing over the area thats cracked....Part of his reasoning behind the concrete cracking is because we used a dehumidifier on it...


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PostPosted: Thu Jul 19, 2018 4:31 pm 
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bounce wrote:
Builder took walls out and concreted the floor but now cracking.

They put the concrete down last week and a flooring person came today to DPM it to get ready for laying a LVT.

The flooring guys had said to get a dehumidifier to help remove the moist and speed up drying.

Today they came and part of the new concrete floor cracked/crumbled and couldn't put the dpm on.

The builder that laid the concrete seems to be only the area that cracked, the rest of it seems more solid. How do we know if rest is ok or do we take his word for it? The builder said he will lay a latex thing over the area thats cracked....Part of his reasoning behind the concrete cracking is because we used a dehumidifier on it...


My first thought was given the warm weather the concrete dried out and cracked before it cured, then on top of that de-humidifier will have sucked out the moisture quicker.

The flooring guys probably wanted the concrete dry so they could get on with their bit.

Got a picture?


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PostPosted: Thu Jul 19, 2018 4:45 pm 
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Quote:

My first thought was given the warm weather the concrete dried out and cracked before it cured, then on top of that de-humidifier will have sucked out the moisture quicker.

The flooring guys probably wanted the concrete dry so they could get on with their bit.

Got a picture?


Cement /concrete doesn't cure by air, its cured by a chemical reaction


But if the surrounding concrete wasn't damped down it will pull the moisture out of the new affecting the curing process

To do it properly, dig it out an lay it again - you could lay self levelling compound if it its the finished floor


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