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MMS- Are some unreliable with high RH?
11-11-2011, 07:12 AM,
RE: MMS- Are some unreliable with high RH?
OK you switched from talking about after the fact high moisture readings to explicitly talking about a vapor retarder under slab. Of course if there is no retarder under slab some manufacturers will not warranty it, although the tech guy I talked to at Bostik said they warranty it up to 15 lbs.

And 90 percent of the time there are no retarders under slabs, yet you still are required to test even if there is a retarder under the slab. Why? theres a reason, go ask. Can't tell ya how many slabs are gone over without an additional layer of glue/vapor retarder. Basically MVP4 is just another layer of glue without the anti-slumping compound in it. If I am using just BB then I always step up the notch. I can read slabs. I used to strictly do sheet vinyl and never tested, never had a moisture issue.

How about their newer adhesives like the One Step, the Seal N Grip, do they function better because they have an extra layer of adhesive or is it strictly the chemical composition or both that ae supposed to prevent failures? Do they also state there must be a vapor retarder under the slab?

Now for your claim that any after the fact high reading will void any warranty. Thats complete nonsense. If that were true there would be no flooring going down and no glue sales.

The most important thing is is to NOT install when the readingsa are high.

Stephen Perrera dba
Top Floor Installation Co.
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RE: MMS- Are some unreliable with high RH? - Ernesto - 11-11-2011, 07:12 AM