I am looking for the best method of appling Engineered Hardwood flooring to a Radiant heating system. Should I float, glue, I also would like to reduce heal clicking noices.

What kind of slab are we talking about? Generally you wouldn't want to nail into concrete. A floating floor has a lot of advantages. Glueing is pretty iffy.

tom

can anyone tell us if a very small amount of mold on the ceiling with radiant heat is a big problem. or is it an easy fix?