EPS versus PUR: which insulation material best suits your project?


From glass wool to synthetic foams, there are many types of insulation to choose from when you’re about to insulate a home. Two of the most popular insulation materials are PUR and EPS. But what exactly is the difference between them? This article explains when to use which.

EPS: affordable and recyclable

EPS (Expanded polystyrene) – also known as polystyrene foam – are plastic insulation boards which are usually white or in some cases grey. EPS has been used as an insulation material for more than fifty years now, and rightly so. It’s a great thermal insulator and an affordable one at that. The EPS insulation boards are lightweight, easy to work with, insensitive to humidity and mould, and 100% recyclable.

PUR and PIR: light insulation boards with an excellent R-value

PUR (polyurethane foam) and PIR (polyisocyanurate) both have a unique cellular structure. Composed of small cells filled with a low-thermal conductive gas, PUR and PIR are two of the most efficient insulation materials on the market, renowned for both their excellent thermal performance and compactness, enabling installers to opt for a thinner insulation layer without compromising on effectiveness.

PUR and PIR are very versatile insulation materials suited for =walls and floors as well as flat and pitched roofs. SOPREMA offers various PUR and PIR boards for several applications, including:

  • EFISARKING are lightweight insulation boards for sloping roofs.
  • SIS REVE SI is excellent thermal insulation for vertical and inclined front walls, and suitable for both renovations and new construction. The boards come with plasterboard already attached.
  • SOPRATHERM ALU has a high thermal resistance suitable for insulating cavity walls, interior walls and floors.
  • EFIGREEN ITE is a thermal insulation board coated with aluminium wafer foil on both sides which makes it more fire-proof. It is recommended for insulating front walls from the outside.

How to pick the best insulation material? Ask a pro!

Still not quite sure which of our innovative insulation materials best suits your project? Or would you like to receive more information about our solutions? Feel free to contact us and receive professional advice.