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MMS- Are some unreliable with high RH?

In the USA the current hardwood standards that I deal with are via the mfma (since I do gyms). The mfma requires rh testing to read 80% for the system you describe and 75% for glue down systems.

We put the equivilant of 15mm stego wrap under our wood systems and loose many bids vs the guys who put 6mm home depot poly. However, I wouldn't change, it is cheap insurance.

In California the wood flooring installers are really poor. I even know some who still rely on the tape down plastic method. All low bid and run. I even know some who will not use rh tests and use cacl tests to get low test results. As if they put their fingers in ears and yell la la la la la

I would say a vapor membrane on top of concrete is standard. Quality varies by product and contractor. But mms systems are the exception except where there is high moisture when you do get mms systems.

Messages In This Thread
RE: MMS- Are some unreliable with high RH? - eaadams - 11-06-2011, 08:01 PM

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