Insulation in layers for UFH?

[JFDIY]

I've got about 140mm to make up in insulation between my sub floor and screed/UFH.

 

My question is are there any benefits from an ease installation perspective to doing this in two layers V's one thick layer?

 

 

Edited April 21, 2020 by JFDIY

[MikeGrahamT21]

If you have multiple layers and you tape all of the joints on each layer, essentially there should be less chance of air infiltration.

Thinner layers are easier to cut

Possibly will work out cheaper

 

Can't think of any other benefits.

[Russell griffiths]

2 layers and stagger the joints. 

Less pathways for heat loss.