Hello,

Most of my first floor has Shaw's 5" wide 3/8" thick engineered hardwood flooring that was glued down on a concrete subfloor by the builder. 5 years later, I'm ripping up the carpet in the remaining rooms and replacing with the same flooring. I don't know what adhesive the builder used. Does anyone have any recommendations? I'm in central TX, so humidity/moisture is not an issue. Thanks.

There are many glues made to hold flooring to a slab. Find a flooring distributor to get the best selection. Be sure to make the slab flat to within a quarter inch in ten feet using a straight-edge, or an eighth inch in six feet or you may get hollow spots.
Five gallon paint buckets filled with water will be great to hold rows down. Get empty buckets at a commercial painting company. They just throw them away.