Can You Use Polystyrene as Insulation

In its expanded form, polystyrene has low thermal conductivity which makes it a great insulator. Polystyrene foam contains a lot of small pockets of air within its structure, and this is an important key to its insulating properties.

Can you use polystyrene as wall insulation?

Polystyrene is the most popular insulation material for exterior walls.

Can I use polystyrene instead of Celotex?

3 Answers from MyBuilder Flooring Fitters polystyrene is cheaper than celotex. R value or 50mm polystyrene is 1.25. R value of 50mm Celotex is 2.25. It has to be noted that over 7-10 years Celotex will drop in R-value to match the polystyrene as polystyrene will not drop.