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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