insulation underneath a concrete floor......

[6sally6]

Would it make a noticeable difference in comfort to lay down 1" sheets of poly insulation before the concrete is poured? NO heated floors just an insulating substance between the concrete and the ground.
Thanx
6sally6

 

[The Cobbler]

I did 2" xps and glad I did . the floor is not heated and I think it helps to keep it warmer

 

[yeldogt]

Need depends on location ... same with VB.

 

[rburke65]

The OP states it’s under his house......

 

[Josey Wales]

The OP states it’s under his house......

So it's a floor, and/or ceiling thing?