High moisture engineered wood floor installation


Old 10-29-16, 12:50 PM
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High moisture engineered wood floor installation

Last year we had a contractor install engineered wood floors glue down on slab on grade.

At the time, he did a tremex moisture test which read 4.5.

This summer the wood began cupping, bubbling, and turning black due to excess moisture.

We put in a warranty claim with the supply house.

The supply house did the following:
(1) hired an inspector to write a report. In their report they cited a tremex reading of 4.75 and structural issue for not having gutters.
- told the supply house that our house doesn't need gutter because (1) its not required by code (2) we have eaves and (3) we have a hip roof to evely disperse the water.

(2) after the supply house realized the readings were below the 10lbs rating of the glue, they did a calcium chloride test which came back at 19lbs and a pH of 4.

What I have learned from this process is that (1) very few people know how to properly do a calcium chloride test. Even the instructions provided with the calcium chloride test were not to the ASTM F1869 standard. (2) even if people do know how to do the test, they rely on tremex exclusively AND (3) do your own research beforehand to help ferret out the good contractor from the bad contractor.

That said, the contractor has proposed to fix it using the following method:

- 6mm plastic barrier over concrete slab and run plastic 4 inches up wall
- tongue and groove floating adhesive
- sound / moisture proof underlayment
- floating tongue and groove installation.

Is this enough?
Should we use epoxy floor sealer?
Should be just go with tile?
Is this moisture level common for South Florida, or do we have a larger problem?

The house is about 30 years old. Maybe there is no vapor barrier on the slab? Maybe the vapor barrier has past its useful life.

Any thoughts / experiences would be greatly appreciated. We don't want to go through this again.
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Old 10-29-16, 02:18 PM
chandler's Avatar
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Welcome to the forums! If it were mine, I would install a vapor barrier/underlayment and install 3/8" click lock engineered flooring. It will float without the messy glue and has a better track record than glued to slab installation.

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