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EPS vs XPS
| What Should You Choose? | LTTR & Why It Matters | Resources

DESIGNERS, SPECIFIERS, BUILDERS, AND DEVELOPERS HAVE EVER-CHANGING NEEDS. Plasti-Fab EPS insulation meets those needs better than other solutions for a number of reasons. For over 50 years Plasti-Fab has been the supplier of choice for expanded polystyrene (EPS) insulation product solutions. In those years, we have learned a thing or two about what works for various types of building products applications from residential and commercial construction, geotechnical applications, and so much more.

 

When your motto is quite literally Quality, Service, Expertise, it is more than just marketing, it is the foundation on which we stand to supply our customers with the best products and solutions. With third-party testing, technical information, and in-house expertise at multiple levels, we can provide recommendations for EPS product solutions for a multitude of applications and stand firmly behind the quality we have established.

 

We encourage you to choose quality. Choose service & the expertise you can count on. Choose Plasti-Fab for your EPS insulation solutions.


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EPS INSULATION VS XPS INSULATION


R-value

EPS insulation does not lose R-value
Graphite enhanced EPS @ R4.7
per inch



Compressive Resistance

10 to 60 psi compressive resistance 
to suit application.



Dimensional Availability

Options to suit product application
Supplied to required length, width
and thickness.



Water Absorption 

Greater drying potential





Environmental 

Manufacturing process with pentane blowing agent
results in lower Global Warming
Potential (GWP) 4 kg CO2 equivalent.


R-value

XPS insulation loses R-value
5 year time-weighted average @ R4.7 to 4.8
and decreases further with time.



Compressive Resistance

Higher compressive resistance
often specified at higher cost.



Dimensional Availability

Limited product options. Supplied
in 2 or 4 foot widths 
and maximum 4 inch thickness.



Water Absorption 

Limited drying potential
Less water may enter, but does not dry as well 
as EPS. R value impact due to water



Environmental 

Manufacturing process with HFC blowing agent results in higher
GWP 80 kg CO2



BEST VALUE


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What should you choose?



Click HERE to Learn More


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What is LTTR and why does it matter?


LTTR stands for Long-Term Thermal Resistance, and is a predicted R-value for some cellular plastic insulations manufactured with the intent to retain a blowing agent, other than air, for a period longer than 180 days and is intended to represent their R-value after five years of in situ aging. Certain types of insulation continue to lose R-value over the life of the product, making it necessary for the manufacturers of these products to provide information to you on what they anticipate your R-value to be in the future.

 

So why does EPS insulation NOT have LTTR listed in the comparison tables between EPS and XPS? LTTR is not applicable to EPS because... It is not manufactured with the intent to retain a blowing agent and due to its closed-cell nature, there is no reduction or loss in R-value over time. EPS has the SAME R-value in the future, as it does on the first day you install it. You can be confident that the R-value you specified and installed, is the same R-value that will perform in that application for the life of the product. See PIB 241 below for additional information.


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Resources

Product Performance
PIB 209 - In-Situ Performance of EPS Insulation Below Grade
PIB 268 - EPS Insulation R-Value Retention Outperforms XPS Insulation after 15 Year Below-Grade Service
PIB 288 - A Measure of Confidence in Polyisocyanurate Insulation LTTR
PIB 303 - XPS Insulation In-Situ Water Absorption
PIB 309 - Plastispan and XPS Insulation per ASTM C578 Types
PIB 314 - ASTM Long-Term Thermal Resistance (LTTR) of Foam Plastic Insulation
PIB 361 - EnerSpan® Insulation and XPS Insulation ASTM C578 Types & Material Properties

Product Data Sheets
PIB 208 - ASTM C578 - Plastispan Insulation Material Properties
PIB 247 - Durospan Insulation - ASTM C578, Type I Material Properties
PIB 283 - PlastiSpan EFS Insulation - USA Applications
PIB 302 - EnerSpan Insulation Material Properties for ASTM C578 Types
PIB 305 - ASTM C578 PlastiSpan Insulation for High Compressive Load Applications
PIB 308 - ENERGREEN Insulation Material Properties - ASTM C578 Product Types
PIB 321 - PlastiSpan Insulation - ASTM_C578, Type I Material Properties
PIB 322 - PlastiSpan HD Insulation - ASTM_C578, Type II Material Properties
PIB 323 - PlastiSpan 25 Insulation - ASTM_C578, Type IX Material Properties
PIB 324 - PlastiSpan 40 Insulation - ASTM_C578, Type XIV Material Properties
PIB 325 - ENERGREEN Insulation - ASTM_C578, Type I Material Properties
PIB 326 - ENERGREEN HD Insulation - ASTM_C578, Type II Material Properties
PIB 327 - ENERGREEN 25 Insulation - ASTM_C578, Type IX Material Properties
PIB 328 - ENERGREEN 40 Insulation - ASTM_C578, Type XIV Material Properties
PIB 335 - PlastiSpan XI Insulation - ASTM C578, Type XI Material Properties
PIB 348 - EnerSpan EFS Insulation - Canadian Code Compliance

Building Code Compliance
PIB 312 - EnerSpan and DuroSpan GPS Insulation - Intertek CCRR-1033
PIB 346 - Plasti-Fab EPS Product Solutions - Intertek CCRR-1072
PIB 355 - US Product Certification Listings for EnerSpan Insulation

Please refer to the Technical Library page for additional application specific PIB's by clicking here.


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