Hi! I have a slab foundation seasonally prone to some moisture. It was mid level when I measured it few months ago.

I am trying to install Engineered Wood on slab.

My installer told me I needed 1) Apply Decorez epoxy first and then some
Acrylic Urethane Adhesive for Engineered Wood Floors.

The total cost of underlayment materials per 1600 sq f is about $1200.

I am wandering whether Bostik MVP4 is all I need. I know MVP4 is more expensive but do I really need both (decorez and acrylic urethane glue). MVP4 seems to do it all ? Can't I just use MVP4?

Many thanks in advance,

Why do you think he is lying to you?
he is trying to give you the best job he knows how and using products he knows and is comfortable with.
I personally do not know the product you mention.

However MVP4 would solve your situation as you would still need an adhesive.

You would be better off with Bostik VaporLok or Ultra Set for an all in one application.

Bottomline is you hired him to do the job right for you and he is the one who needs to back his work.
He knows of your issue and this is how he feels confident handling it.

With no knowledge of this epoxy, but a little digging indicates it's probably a poor suggestion as a sealer. Having more experience with concrete sub floors than most here, it's always advisable to work with something that is used in tandem with hardwood floors & concrete. I see potential bonding issues when the adhesive is applied.

James mentions several good products that are used quite often in our business.