Problems in the UK, HELP!!!!

[bugs183]

Hi chaps.
I'm from the UK and i'd like to pick your brains if i can.
I'm a floor and wall tiler and in our country we have happily laid millions of m2 of flooring on concrete screeds until..
The introduction of Calcium Sulphate, or Anhydrite screeds.
These self levelling Gysum based floors have suddenly appeared on site and are causing lots of problems.
Cement based adhesives react with the gypsum and the floor fails.
No body seems responcible for removing laitance from the screed after a week which slows down the drying tim and gives a weak bond to fix too, and above all, this is my main beef, moisture testing.
It appears we have introduced a product into our country without any real research by our British Standards body, we have standards for everything regarding concrete but very little for these screeds.
So do you guys use these kinds of screeds in the U.S?
If so how do you find them, and as regards to moisture testing, no one can decide which is the best method. BS advise a hood test, for concrete, but after looking at Wagners videos i can understand why this is not the best test. We use a lot of under floor heating systems with these screeds so i was thinking of getting the customer to turn off the heating for at least 48 hours before i test, get to site, turn on the heating briefly, find a clear spot with a thermal imaging gun and drill a probe into the floor.
How does that sound to you?
I am not a surveyer, do you in the States have slab only based qualifications?? This is something i'm interested in getting into as no one is doing this kind of work here.
I look forward to any replies.
CHeers, JB.