Most enginiered hardwood floors offer the installation options of Glue Down, Floating or Nail Down.
In my opinion the glue down method is preferable in most applications. I often tell clients that “If we glue it down, you won’t be calling us back”.
When you glue a hardwood floor the entire board is secured to the subfloor weather your subfloor is a concrete slab or a raised wooden subfloor, the bond locks the two together for the life of the floor. Not only does this firm up a raised wooden subfloor, fill in some low spots, it helps seal a concrete subfloor by filling the gaps under the floor where humidity and moisture could travel.
Unlike the floating or nail down methods the glued hardwood floor is less likely to move, creek, pop and expand and contract with humitiy changes and/or work itself loose over time.
A quality Moisture Cured Urethane Adhesive is the preferred choice due to its water resistance properties. It is very important to keep this glue off the surface of the new hardwood floor. This adhesive can get messy. You may get some glue on your finger setting a board and the next thing you know it is in your ear, in your hair and up your nose. I’m not kidding. If and when this happens be sure to clean it up quickly before it dries, for it is a bugger to remove later and can dull the shine of a new floor and last for days on your skin. Be sure to check the label on clean up before you start.
Most installers spread about 2 feet wide sections at a time so they can reach over the glue and set the wood in place before the adhesive skims over. Read the label on the bucket to be sure you use the proper trowel notch or you could have problems with bonding (two little) or adhesive working its way up through the tounge and grove (too much) before it dries. Little or no traffic should be on the flooring for 24 hours after installation to prevent adhesive from working its way up and getting tracked across the floor.
As with any of the installation methods you can alway change boards out at a later time if damage ever occurs.