UFH and underlay

[Walshie]

Hi,

Screed is down and dying out.

I have wet UFH in 50mm of anhydrate screed. I plan to use engineered timber flooring.

 

I’ve had the screed sanded to address laitence etc.

 

The question I have is whether to lay underlay, or bond directly to the screed.

 

I have been advised that underlay will impair the efficiency of the UFH?

 

I’d appreciate your advice please?

 

Thx

 

 

 

 

 

[JohnMo]

4 minutes ago, Walshie said:

have been advised that underlay will impair the efficiency of the UFH

For UFH you should be bonding the flooring to the screed. An underlay acts as insulation