I am planning to put in an engineered hardwood floor over a grade level concrete slab in our home here in North Texas and have a few questions after spending more time than I probably should reading up on installation and flooring. (It is about time we replace the carpet and figure a wood floor ought to help reduce our suffering with allergies. It should not hurt anyway.)

When it comes to the click lock type flooring, I have found a few comments to the effect that the floors may click and creak a bit more than a glued t&g floating floor. Is this accurate and is it enough so that it would warrant going with a glued t&g floating, over a click type? Any other considerations and are there any of these click and lock type brands that seem to be better than the other for working with and holding up?

I am planning to use the plastic sheeting along with a pad. However I am finding a few pads that claim they are 2 in 1. How are they?

I believe I know the answer to this one, though I want some confirmation. I had a guy that does this stuff for a living make the comment that we ought to glue down an engineered wood floor directly to the slab, using some type of moisture absorbing glue, instead of using a pad. To me this sounds like rubbish, but hey I don't do it for a living. Seems over time, that enough moisture could build up to warp and rot the floor, not to mention it would be that much harder underfoot without padding. What is the thought here?

I have noticed a few of these engineered floors that have some type of thick single layer HDF Core on these click lock types. Is this stuff decent compared to the traditional multiple layer wood core?

While we are not set on a particular one yet, these are some rough ideas of what we are thinking. I figure if we can determine what brand and decide between doing the click lock or the t&g, they will likely have something similar in appearance.

http://www.homedepot.com/p/Home-Legend- ... Z-pr_co5jo

http://www.hoskinghardwood.com/Hardwood ... ?pId=49952

http://www.hoskinghardwood.com/Hardwood ... ?pId=57239

http://www.hoskinghardwood.com/Hardwood ... ?pId=50775

I realize that is quite a few questions and I do appreciate the input. Thank you.