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External Wall Insulation Expanded Polystyrene Insulation

Expanded Polystyrene insulation is a lightweight, rigid, closed cell insulation. EPS is available in several compressive strengths to withstand load and back-fill forces. This closed-cell structure provides minimal water absorption and low vapor permanence.

Expanded Polystyrene insulation (EPS) is practical and economic and efficient and can be applied to all areas of building constructions – ceilings, roofs, walls, floors and under slab – to provide superior standards of thermal insulation. That’s why EPS is the ultimate insulation.

Benefits of using EPS as extarnal wall insulation

Commonly used as insulation for walls, foundations and roofing, there are many benefits to selecting EPS products:

• Long-term R-Value (“R” is the resistance to heat flow)

• Energy efficiency

• Constant thermal resistance

• Measurable energy savings

• Strength• Sustainability

• No growth of bacteria, nor will it decay over time

• Dimensional stability

• Chemical inertness

• Low cost

Pros and Cons of Expanded Polystyrene Insulation

Pros :

  • Recyclable products that assist with LEED points.
  • Won’t support mold or mildew growth.
  • Long-term, stable R-value.
  • Can be placed below grade.
  • Can be utilized for inverted assemblies (over membrane).


  • Exposure to sun will deteriorate the product.
  • Solvents/solvent-based materials cause irreversible damage.
  • Elevated temperatures (above 250 degrees F.) will “melt” polystyrene.
  • Incompatible with certain thermoplastics, polystyrene insulations are known to draw plasticizers out of thermoplastic membranes, causing permanent degradation.
  • Polystyrene is flammable, requiring proper placement in any assembly.