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Roof Insulation with Rigid Foam

Airfoam offers a wide range of high performance, budget-friendly roof insulation products. Over more than 45 years, Expanded Polystyrene (EPS) roofing insulation became the solution of choice for new and re-roofing needs because of its many benefits.

From flat and custom-tapered Korolite® Insulation to Quad-Deck Insulated Concrete Forms and Geofoam lightweight fill material on green roofs, we have an insulation product for almost every roof type.

Fitting EPS Insulation Boards


   Exceptional Insulation Value

Budget-friendly, stable Long-Term Thermal Resistance (LTTR) with the highest insulation value per dollar spent

   Outstanding Performance

Continuous insulation that resists moisture and many other adverse effects, available in many compressive strengths and thicknesses, including custom-tapered for drainage slopes.

   A Breeze to Design & Install

Design flexibility, versatility, and support for custom roofing packages. For high jobsite productivity, EPS roofing products are lightweight & easy to handle and cut.

   Environmentally Responsible

Excellent durability, high recycled content and low environmental impacts using Air as insulator instead of CFC, HCFC, or HFC gases


Insulated Roof Decks, Metal/Steel Deck, Concrete Deck, Wood Deck, Roof Gardens, Green Roofs, Attics, Cathedral Ceilings & more

Modified Bitumen (SBS), Single-Ply membrane (TPO, EPDM, PVC), Built-Up Roofing (BUR), and Inverted Roof Systems

Ballasted Systems, Partially Adhered Roofing Systems (PARS), Adhesive Adhered Roofing Systems (AARS), and Mechanically Attached Roofing Systems (MARS)

Airfoam is an approved supplier for RCABC's Roofstar Guarantees in British Columbia.

Technical Data

Korolite® Specifications 100 Types 1, I 130 Types 1+, VIII 160 Types 2, II 200 Types 2+, II+ 250 Types 3, IX 400 Type XIV 600 Type XV

For Tilt-Up with Grid Marks 200 Types 2+, II+ 250 Types 3, IX

Korolite® Types Overview Korolite® Installation Guide 30-Year Limited Warranty Environmental Product Declaration Shallow Foundations


Code Evaluation Report Thermal Insulation CAN/ULC-S701, ICC-ES AC12, ASTM C578 with Surface Burning Characteristics CAN/ULC-S102.2, ASTM E84 (UL 723), Intertek Listed & Inspected
Wall Assemblies:
¾ Hour Fire Rating for a Composite Wall Assembly with EPS c.i. CAN/ULC-S101, ASTM E119
Meets NFPA 285 with specific limitations for an Exterior Wall Assembly with EPS c.i.

Underwriters Laboratories

BRYX.R7726 - Foamed Plastic Surface Burning Characteristics ANSI/UL 723
TGYVC.R19427 - Roof Deck Construction Materials Fire Spread Under Roof Deck Assemblies CAN/ULC-S126
CDET7.R19427 - Rigid Roof Insulation Fire Resistance Ratings CAN/ULC-S101
Roof Assemblies:
TGKXC - Roof Deck Construction No. C7, C12A, C12B, C38
BXUVC - Roof Fire-Resistance Ratings Design No. R210, R222

Material Properties of Korolite® Insulation Types
Property¹ Units Korolite® Types Test Std.
100 130 160 200 250 400 600
Third-Party Certified Type Canada 1 1+ 2 2+ 3     CAN/ULC-S701
Compressive Resistance2 Minimum
@ 10% Deformation psi 10 13 16 20 25 40 60 ASTM D1621
kPa 70 90 110 140 172 276 414
Thermal Resistance3,4 Minimum at mean temperatures of:
R-value/inch thickness ft²•hr•°F/ (BTU•in) 25°F: 6 4.2 4.4 4.6 4.6 4.8 4.8 4.8 ASTM C518
or C177
40°F: 6 4.0 4.2 4.4 4.4 4.6 4.6 4.6
75°F: 3.75 3.8 4.04 4.1 4.27 4.27 4.3
RSI / 25mm
m²•°C/ (W•25mm) -4°C: 6 0.73 0.76 0.80 0.81 0.83 0.83 0.83
4°C: 6 0.69 0.73 0.76 0.77 0.80 0.80 0.80
24°C: 0.65 0.66 0.70 0.71 0.74 0.74 0.75
Water Vapor Permeance4
Maximum @ 1" thick
perm 5.0 3.5 3.5 3.3 2.3 2.3 2.3 ASTM E96 desiccant
ng/(Pa•s•m²) 287 201 201 190 132 132 132
Water Absorption5
% by
USA 4 3 3 3 2 2 2 ASTM C272, 1 day
Canada 6 6 4 4 2     ASTM D2842, 4 days
Flexural Strength
psi 25 30 35 40 50 60 75 ASTM C203
kPa 172 208 240 280 345 414 517
Density7 Nominal6 lbs/ft³ 1 1.65 2 3 ASTM D1622
Minimum7 kg/m³ 14.4 18.4 21.6 24 28.8 38.4 48

¹ The test methods used to determine the material properties provide a means of comparing different cellular plastic thermal insulations. They are intended for use in specifications, product evaluations and quality control, but they are not intended to predict end-use product performance.  ² The elastic limit is between 1% and 2% strain. Compressive resistances at 10% strain are provided for applications where the intended end-use can tolerate plastic (permanent) deformation under load.  ³ R means resistance to heat flow. The higher the R-value, the greater the insulating power.  4 Values are for 1 inch or 25mm thick samples with natural skins intact. Better values will result for thicker materials.  5 The lab-test methods for water absorption use complete submersion under a head of water for 24 or 96 hours, so the values are applicable to specific design requirements only when the end-use conditions are similar to test method requirements.  6 not part of all the industry consensus standards (ASTM C578, CAN/ULC-S701) and provided AS-IS solely for informational purposes.  7 Minimum Density only applicable to USA-bound products per ASTM C578 (not Canada-bound products per CAN/ULC-S701).

Additional Properties of EPS

Expanded Polystyrene (EPS) resists mold & fungi growth per ASTM C1338 and has no nutritional value for insects. To protect against termites place adequate physical barriers such as membranes around below-grade EPS.
Max. Service Temperature: Long-Term Exposure 75°C [167°F], Intermittent Exposure 80°C [176°F]
Thermal Expansion coefficient: 5-7•10-5/°K
Dimensional Stability¹: max. 1.5% linear change per ASTM D2126 (7 Days @ 70±2°C)
Solubility: Insoluble in water and in general chemically inert. EPS dissolves in hydrocarbons (e.g. fuels, oils, tar), organic solvents (e.g. acetone/ketones, benzene, paint thinner), ethers, esters, aldehydes and amines. Capillarity: None
UV-light surface degradation: white EPS can be exposed to direct sunlight for a few weeks. Prolonged exposure to ultraviolet light creates a yellow dust on the surface of EPS products which has negligible impact on the products' properties but may require removal before adhering other materials such as stucco or self-adhesive membranes.
Surface Burning Characteristics Canada CAN/ULC-S102.2: Flame-Spread Rating ≤295, Smoke Developed Classification over 500.   USA ASTM E84 (UL 723)ª: Flame Spread Index ≤25, Smoke-Developed Index ≤450 up to 6" thick
Limiting Oxygen Index: min. 24% per ASTM D2863. Airfoam's EPS for construction applications contains a polymeric (non-HBCD) fire retardant modifier.
CAUTION: EPS products are combustible and must not be exposed to excessive heat, sparks, open flames, or any other sources of ignition. A protective barrier or thermal barrier is required as specified in the appropriate building code. If stored/used in closed containers, confined, or low-lying areas, ensure adequate ventilation to prevent accumulation of flammable pentane vapours. Prevent inhalation of smoke, fumes or dust from burning or fabrication activities. GHS Classification: Non-Hazardous, see SDS

ª Ceiling measurement only, conducted through determination of flame spread index and smoke-developed index with the removal of any contribution of molten materials ignited on the floor of the Steiner tunnel.

Quad-Deck Insulated Concrete Forms for Roofs Technical Summary & Specs