I am installing a 7 ply engineered wood, slab on grade, that has been painfully adjusted to flat, and was covered with MVP4.

Is rolling with a 100 LB roller needed, always a good idea or what? The adhesive I am using in Bostik's EFA, which is a wet lay, no flashing adhesive. With wet lay, is rolling still needed?

As for the EFA, any comments about it? I went with that because it was recommended by Bostik and variuos local retailers who could have sold the more expensive adhesives. This product is designed for engineered wood only, not solid and will come up when pried if needed easier than regular adhesives. Per Bostik, they desigend it for installers who complained that other adhesives made it very difficult to remove glue downs if needed for repair or change out later on

My first thought, why use something that can be pried off easier, but I'm sure it is still very difficult

I roll all my floors.

Actually some manufacturers reccomend NO rolling on some glue-down installations. The reason being that when glue is spread with a notched-trowel it creates ridges, these ridges are there to hold the flooring on top of the substrate and allow for movement during climate changes. By rolling the flooring you're pushing the wood down into the glue too far and creating spots that won't move and will buckle.

I roll the majority of my floors, but now seek out each manufacturers demands on this subject before doing so.

That is the funniest thing I've heard an installer say in some time!!

Please name the adhesive manufacture that says DO NOT ROLL THE FLOORING!! I know several that suggest it is not needed with their adhesive(because of its anti-slump characteristics) But none say DO NOT ROLL THE FLOOR.

The ridges are there for grab, especially in todays world of fast paced building, and floor prep rarely done to perfection.

You will notice, all adhesives have a trowel selection guide on the side of the pail. It isn't a one size trowel fits all flooring types, ie. plank vs. parquet


I tell you what, as a Certified NWFA failure inspector, you have been way misinformed about adhesive bond, or lack of, and where buckling will occur in a glued down wood floor!!!!

I suggest you contact Howard Brickman , and find time to take his wood science and flooring classes he teaches, along with taking the NWFA inspectors test. It will teach you facts about wood and installation, instead of hearsay, or I heard from... You will have documented material, to know right from wrong, and know when someone is trying to blow smoke up your skirt.

I think what I meant to say was NO rolling until two hrs time. This is straight out of Armstong(bruce,robbins,hartco brands) installation guidline book. To make sure I asked Scott F. Wise (manager of Installation & Technical Services of Floor Products- Americas) this same question about rolling [i]ALL glue down applications...he informed me that rolling a glue down with most of their products don't require a roller, but can be rolled after 2 hrs. cure time.

Who's right?? I don't know but I try to follow all manufacturers guidelines for installations in order to better predict results and also not to void warranties given by the manufacturer of said product.