Polyiso Insulation vs EPS Insulation

by Sep 13, 2018

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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