EPS, XPS, and ISO foam insulation are all rigid and lightweight, with excellent insulating properties. However, they differ in composition, manufacturing process, strength, and R-value. Let's take a closer look at each type:

EPS (Expanded Polystyrene)

EPS foam insulation is made from expanded polystyrene beads that are fused together. It is a lightweight and versatile product that can be used in a wide range of applications, including walls, roofs, and foundations. EPS foam insulation is also often used in packaging and other applications.

Benefits of EPS foam insulation:

  • Lightweight and easy to handle
  • Affordable
  • Versatile, with good insulating properties
  • Recyclable

Situations for the use of EPS foam insulation:

  • Walls and roofs
  • Below-grade applications
  • Packaging

XPS (Extruded Polystyrene)

XPS foam insulation is made by melting polystyrene pellets and extruding them into rigid panels. It is a dense and strong product that has a higher R-value per inch than EPS foam insulation. XPS foam insulation is often used in below-grade applications, such as insulating foundation walls, as well as in roofing and other applications.

Benefits of XPS foam insulation:

  • Dense and strong, with high compressive strength
  • Moisture-resistant
  • Resistant to mold and mildew
  • Higher R-value per inch than EPS foam insulation

Situations for the use of XPS foam insulation:

  • Below-grade applications, such as foundation walls and slabs
  • Roofing and other applications where high compressive strength is needed

ISO (Polyisocyanurate)

ISO foam insulation is made from polyisocyanurate resin and other chemicals. It is the most energy-efficient of the three types, with a high R-value per inch. ISO foam insulation is often used in roofing applications, as well as in wall and floor assemblies.

Benefits of ISO foam insulation:

  • Highly energy-efficient, with the highest R-value per inch
  • Resistant to moisture and vapor
  • Excellent fire resistance
  • Can be used in a wide range of applications

Situations for the use of ISO foam insulation:

  • Roofing applications
  • Wall and floor assemblies
  • Any application where high energy efficiency is desired

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