Underlay needed for engineered wood of UFH + Screed?

[jayc89]

I'm laying engineered wood in a small room, approx 5m2. The sub floor is 60mm sand/cement screed, with UFH. I plan to fix the engineered wood with a flexible adhesive, do I need an underlay before that, if so, are any better than the rest?

[JohnMo]

No underlay otherwise you are glueing to the underlay which is a bit of waste time and expensive glue.  You either float on underlay or glue not both. Glue is better for heat transfer.