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

10 to 60 psi compressive resistance to suit application.
Compressive Resistance

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

Greater drying potential
Water Absorption 

Manufacturing process with pentane blowing agent results in lower Global Warming Potential (GWP) 4 kg CO2 equivalent.
XPS insulation loses R-value 
5 year time-weighted average @ R4.7 to 4.8 
and decreases further with time.

Higher compressive resistance 
often specified at higher cost.
Compressive Resistance

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

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

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


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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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Product Performance
PIB 209 - In-Situ Performance of EPS Insulation Below Grade
PIB 241 - Long-Term Thermal Resistance (LTTR) of Foam Plastic Insulation
PIB 268 - EPS Insulation R-Value Retention Outperforms XPS Insulation after 15 Year Below-Grade Service
PIB 285 - PlastiSpan and XPS Insulation per CAN_ULC-S701.1-2017
PIB 288 - A Measure of Confidence in Polyisocyanurate Insulation LTTR
PIB 303 - XPS Insulation In-Situ Water Absorption
PIB 362 - EnerSpan Insulation and XPS Insulation CAN/ULC-S701.1:2017 Types & Material Properties

Product Data Sheets
PIB 204 - PlastiSpan EFS Insulation – Canadian Applications
PIB 214 - PlastiSpan, PlastiSpan HD and PlastiSpan 25 Insulation
PIB 304 - EnerSpan Insulation Material Properties for CAN/ULC-S701 Types
PIB 339 - PlastiSpan Insulation for High Compressive Load Applications
PIB 343 - DuroFoam Insulation - CAN_ULC-S701, Type 1 Material Properties
PIB 344 - DuroFoam Plus Insulation - CAN_ULC-S701, Type 2 Material Properties
PIB 347 - ENERGREEN Insulation Material Properties per CAN/ULC S701
PIB 348 - EnerSpan EFS Insulation - Canadian Code Compliance
PIB 354 - DuroSpan GPS Insulation - CAN_ULC-S701 Types 1 Properties

Building Code Compliance
PIB 207 - Recognition of CCMC Product Evaluations
PIB 231 - Canadian Certification Listings for Plasti-Fab Insulation
PIB 312 - EnerSpan Insulation - Intertek CCRR-1033
PIB 346 - Plasti-Fab EPS Product Solutions - Intertek CCRR-1072

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

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