30mm rigid XPS (GG300) under 14mm engineered flooring

[Paul Manchester]

I plan to lay a 14mm engineered floor (B&Q Marcy - softwood ply with oak top layer) downstairs over a concrete floor.

It would be nice to use an underlay that is more insulating than the typical 5mm fibreboard, to loose less heat and have the floor feel slightly warmer to the feet.

Would it be wise to lay the boards directly on top of 30mm Kingspan GreenGuard GG300 XPS?

This is advertised as having high compressive strength (>300 kPa):

Kingspan GreenGuard GG300

www.kingspan.com

Recommended alternatives welcome.

 

[IJWS15]

If I follow the link posted there is a “Talk to us” button - did you use it and what did they say?

Interested as I may do the same.