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Insulated Metal Panels

Korolite® Insulated Metal Panels offer high performance building solutions that lower emissions, reduce lifetime costs and enhance indoor environmental quality. Energy-efficient and airtight insulated metal panels help create advanced building envelopes and cold-storage units. Environmentally responsible, continuous insulation cores are sandwiched between pre-painted steel facings. Build attractive, sustainable, and budget-friendly facilities in record times by combining insulation, finishes, air, vapour & water-resistive barriers.

Insulated Metal Panel Building

Korolite® Insulated Metal Panels are highly versatile, available with various finished looks, and fast to install onto structural framing. Custom-manufactured to the specified lengths and thicknesses, the lightweight modular panels arrive at the jobsite ready to place. Unique interlocks help ensure continuous insulation and minimal air leakage with sealant applied between panels at the jobsite.

Korolite Insulated Metal Panels


Curtain walls & partition walls for Warehouses, Cooler / Freezer Rooms, Commercial, Industrial, Agricultural, Cold-Storage Facilities, Refrigerated, Climate Controlled Buildings & more

Panel Interlocks

To help keep air leakage & thermal bridging minimal, our unique insulation finger joints and roll-formed steel edges help to ensure:
- airtight connections with continuous sealant applied between the steel facings, usually on both the interior and exterior sides and
- EPS overlaps between the panels. When only a butt end is used in competing products, small gaps can develop over time which result in thermal bridging and shadow lines.

Profiles & Colours

Usually the panel sides facing the interior are made with white smooth steel that's CFIA (Canadian Food Inspection Agency) approved and meets USDA requirements under part 16 (Sanitation).

For the other "exterior" side, you can chose between the same smooth steel (e.g. for coolers, freezers, partition walls) or standard, silkline or mesa profiles. Custom colors (not too dark) are available for larger projects.

Wash-Down Finish

Fiber Reinforced Plastic (FRP) or similar protective boards can be applied after installation of the Korolite® panels to the building providing additional protection for applications with special wash down environments such as food processing areas. The boards can be applied to the whole length of the Korolite® panels or select areas.


We can provide many types of doors for coolers, freezers, and production area applications, standard man doors, pallet doors and sliding doors. Options are available for stainless steel trim and aluminum kick plates. Freezer doors are available with 120 volt CSA approved heater wire, temperature gauge and ventilator port.

Technical Information

Korolite® Insulated Metal Panel Properties

The panels are 2-11" thick [50-280mm], 48" [1219mm] or 45-¾" [1162mm] wide and custom-cut to lengths per approved designs. The panels' facings are pre-painted, AZ50 aluminum-zinc coated or G90 galvanized steel in 26 or 24 gauge. They are bonded to the closed cell, expanded polystyrene (EPS) insulation core with a specially formulated adhesive.

Panel Thickness mm 50 102 152 203 254 280
inch 2 4 6 8 10 11
Thermal Resistance1,2 typical per ASTM C518 or C177
@ 75°F 8.08 15.4 23 31 39 42
@ 40°F 8.8 16.7 25 33 42 46
@ 25°F 9.2 17.4 26 35 44 48
@ 24°C 1.4 2.71 4.07 5.42 6.78 7.46
@ 4.4°C 1.55 2.94 4.41 5.88 7.34 8.08
@ -4°C 1.62 3.06 4.6 6.13 7.66 8.43
Air Permeance tested ASTM E283 0.002 l/(s•m²) at 300 Pa
0.0004 CFM/ft² at 6.26 psf
Water Penetration tested ASTM E331 Passed at 137 Pa
Fire Growth of Insulated Building Panels CAN/ULC-S138 Passed in Full-Scale Room Configuration
Surface Burning Characteristics for Panels with Facings
without joints CAN/ULC-S102-07 Flame-Spread Rating 5
Smoke Developed Classification 175
with typ. joints incl. exposed sealant CAN/ULC-S102-18 Flame-Spread Rating 65
Smoke Developed Classification 310
Panel Cores: Korolite® Expanded Polystyrene (EPS)
Canada EPS Type CAN/ULC-S701 2 1 1 1 1 1
Panel Weights
with 26 ga. facings
lbs/sqft 2.18 2.35 2.54 2.72 2.91 3.0
kg/m² 10.6 11.5 12.4 13.3 14.2 14.65

¹ Foam Core Values are calculated by extrapolation of 1 inch thick EPS samples. Data provided AS-IS solely for informational purposes ² R means resistance to heat flow. The higher the R-value, the greater the insulating power.

Library for Korolite® Insulated Metal Panels (formerly "K-Lock")

 Product Catalog  PDF Typical Details  DWG Typical Details  Handling Instructions
Air Permeance & Water Penetration ASTM E283 & E331
Room Fire Growth CAN/ULC-S138 Certificate of Compliance - UL Listing
Surface Burning Characteristics CAN/ULC-S102: without joints and with typical joints
Intertek Listed & Inspected
Canadian Food Inspection Agency (CFIA) Approval with and without FRP
Uniform & Concentrated Loads for Floor Panels
Foam Core Code Evaluation Report

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.