When it comes to finding the best underlayment for heated floors, cork underlayments are the top choice. Real cork can provide excellent results on concrete floors, while eco-friendly cork foam is designed to deliver remarkable performance in any application. There is also an underfloor heating system called QuietWarmth that works perfectly with QuietWalk. This system utilizes conductive ink strips to disperse heat more evenly and efficiently than floor mats made of wire mesh.
FloorMuffler Premium Underlayment has the highest sound control ratings, ranking it number three. It is made of a foam material that leads to a lower R value and its price ranges from QuietWalk to Eco Cork Foam. The cork underlayment is also long-lasting, lightweight, easy to install and the most cost-effective option. The R value is an essential factor when searching for a subfloor and becomes even more important when looking for a subfloor compatible with radiant heat. A subfloor made of cork or fibrous material is ideal for damping sound, while a rubber or felt underlayment provides a moisture barrier.
It is always best to check with the manufacturer of the subfloor, as they may have information that we don't know, but from what you've described, it shouldn't be a problem since the vapor barrier will likely be between the subfloor and the cork subfloor. If you want to reduce the noise of foot traffic, look for an acoustic underlayment made of cork or felt.
