Thank you in advance for any help you can give with my problem.

My flooring is an engineered wood floor in a newly constructed hi rise condo in the Northeast. The problem is multiple spots (at one time about 40 spots in 1500 square feet) across the apartment which depress as you step on the floorboard and a velcro like sticky sound when your foot comes off of the floor. A large group of unit owners have been arguing with the developer for over a year now regarding this problem (the problem resides in multiple apartments and more unit owners complain each month). The developer offered several excuses over the year: The floor needs to settle for two months. The floor needs to climatize over all four seasons. The glue was compromised. The foam underlay needs to be replaced.

The developer came up with three tried remedies:
1. Glue Injection: This worked temporarily but new spots quickly sprung up after each glue injection session. Roughly 50 holes were drilled into my floor and injected with glue. A complete and useless mess.
2. Foam Underlay Replaced: They ripped up the floor in one bedroom and put down glue, a green foam underlay, glue again, and the tongue and groove engineered wood flooring. This worked except for one area near the wall where you can feel the floor buckle way down and creak once you take your foot off of it.
3. One unit owner went the four season climatize route. The problem remained with no improvement at all.

The floor owner came into my apartment with his people and the developer's people before any remedy was attempted. It was quite funny (pathetic) hearing all of these sticky velcro-like noises as all of these guys walked around shrugging their shoulders. The floor owner then said: "Well, this is going to get worse in the summer". He was whisked out of my apartment by the developer as if shots were fired. They came up with the glue injection "remedy" soon after that. The developer continually pushes this glue injection "remedy" to everyone but this is clearly not the answer. We are in the middle of writing another formal letter to the developer regarding this situation and any thoughts and information would be much appreciated. Thank you.

Look on-line and find the installation instructions for your flooring. Look at the flatness specs for the substrate prior to installation. Some are as tight as 1/8 of an inch in a 6 foot radius. Some are 3/16 of an inch in 10 feet.

Also read about required subfloor, especially about lightweight concrete(usually used in upper floors of apartments and condos) and gluedown installations.

I bet you will be surprised what you find. This contractor is going to be crying the blues, and may file bankruptcy before it is over.