Polyiso Insulation vs EPS Insulation

The two most common types of insulation for commercial roof systems are Polyisocyanurate (Polyiso) and Expanded Polystyrene (EPS). Both are available in a variety of thicknesses and can be used in multiple applications. Polyiso is used in new construction designs more than EPS, though EPS still has it’s advantages.

Here is a quick comparison:                                                                    

  CATEGORY

POLYISO

EPS

WINNER

R-VALUE PER INCH:

Higher

Lower

ISO

COST PER SHEET:

Higher

Lower

EPS

FIRE RESISTANCE:

UL class A rating

Combustible

ISO

MOISTURE RESISTANCE:

Lower

Higher

EPS

EASE OF INSTALLATION (TAPERED):

More difficult

Easier

EPS

RIGIDITY:

More rigid

Less rigid

ISO

SYSTEM APPLICATIONS:

Multiple

Multiple

TIE

So which is best?

While the winner may not be so clear, both insulation types have their pros and cons. When it’s time for a new roof, contact your local roofing contractor to help you determine which insulation is best for your building and performance needs.

Polyiso
EPS

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