Insulated Metal Panels and Sandwich Panels
Insulated metal panels, also called sandwich panels or IMPs, are factory-made building panels with a steel face on each side bonded to a rigid insulating foam core. Because the core is continuous through the panel, it controls all four building-envelope barriers at once, water, air, vapor and heat, with none of the thermal bridging you get when insulation is layered into a frame on site. Universal Steel engineers insulated metal panels into the steel buildings we design, where temperature control matters most, from cold storage and food processing to clean rooms and climate-controlled facilities.
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An insulated metal panel is built like a sandwich: two profiled steel skins with a foam core injected and cured between them, bonded into one rigid unit. That single component does the work of structure, weather skin and insulation together, controlling water, air, vapor and heat in one assembly. Because the core runs unbroken from panel to panel, it eliminates the thermal bridging that drains performance where insulation meets steel framing, and a polyurethane core delivers a high R-value of roughly R-7 to R-8 per inch. Concealed fasteners and interlocking joints keep the envelope airtight at every seam.
Most panels are sold as a material for someone to specify onto a building. Universal Steel does it the other way round: because our in-house engineering team designs the whole building, the panels, the frame, the openings and the service routing are engineered together from the start. That matters, because the real drawbacks of insulated metal panels, that you cannot easily run plumbing or wiring through them, that a field-cut panel compromises its coating, that moisture gets in if a joint is sealed poorly, are all problems of fitting panels to a structure after the fact. Designed in from the outset and detailed on the engineered drawings, those problems are planned out rather than discovered on site.
Insulated metal panels earn their place wherever the inside temperature has to hold against the outside. Cold storage and refrigerated warehouses, food and beverage processing, pharmaceutical and distribution facilities, clean rooms and controlled environments all rely on the continuous insulation and the sealed, washable interior face that panels provide. For a general workshop or storage building that only needs basic comfort, a faced fiberglass system is usually the more economical route, and we will tell you honestly which one fits your building.
The insulated metal panel system
Insulated wall panels
Insulated wall panels
Concealed fastener; interlocking side joints
Insulated roof panels
Standing-seam and trapezoidal roof panels that carry the continuous core across the roof plane, sealing out water and holding R-value where heat loss is greatest. Engineered for your span, slope and snow load.
Standing-seam or trapezoidal; continuous core
Insulating foam core
The core is what sets a panel apart, and it comes three ways: polyurethane for the highest R-value per inch, expanded polystyrene as a lighter, more economical option, and mineral wool where a fire rating is required. Thickness is specified to the temperature your facility has to hold.
Polyurethane, EPS or mineral-wool core
Profiles, finishes and jointing
Exterior steel in multiple profiles and long-life coatings, with tongue-and-groove or concealed-fastener joints that keep the insulation continuous at every seam. Color-matched trim and flashings complete the envelope.
Long-life coatings; 25 to 40 year finish warranty options
Insulated metal panel cores compared
The right core depends on what the building has to do. Polyurethane gives the highest insulation value, expanded polystyrene is the lighter and more economical option, and mineral wool is the one to choose when a fire rating is required. Here is how the three compare, so you can see where each fits.
| Type | Typical R-value | Best for |
|---|---|---|
| Polyurethane (PUR/PIR) | About R-7 to R-8 per inch | Cold storage, food processing, highest thermal performance |
| Expanded polystyrene (EPS) | Lower R per inch, lightweight | Economical interior walls, clean rooms, controlled environments |
| Mineral wool | Lower R per inch, fire-rated | Fire-rated walls (1, 2 or 3-hour); water-repellent core |
R-values are industry-typical and vary by product and thickness; we specify the system to your building. Request an estimate.
Panel specifications
- Panel type
- Insulated metal wall and roof panels (also called sandwich panels)
- Core options
- Polyurethane (PUR/PIR), expanded polystyrene (EPS), mineral wool
- R-value
- Up to about R-7 to R-8 per inch with a polyurethane core
- Panel thickness
- From 2 inches, specified to the required R-value (thicker for cold storage and freezers)
- Steel faces
- Profiled steel, multiple profiles
- Joints
- Concealed fastener or tongue-and-groove, interlocking
- Fire rating
- 1, 2 or 3-hour available with a mineral-wool core
- Interior finish
- Standard or food-safe washable options
- Finish
- Long-life coatings, 25 to 40 year finish warranty options
Insulated Metal Panels and Sandwich Panels questions
What are insulated metal panels?
Insulated metal panels, also called sandwich panels or IMPs, are factory-made panels with a profiled steel face on each side bonded to a rigid insulating foam core. Because the core is continuous through the panel, it controls all four building-envelope barriers at once, water, air, vapor and heat, and a single panel provides the structure, the weather skin and the insulation together. They are the standard envelope for cold storage, food processing and other temperature-critical buildings.
What is the R-value of an insulated metal panel?
It depends on the core and the thickness. A polyurethane core gives the highest R-value, roughly R-7 to R-8 per inch, and because the core is continuous rather than interrupted by framing, the panel holds that performance across the whole wall or roof. Expanded polystyrene cores give a lower R-value per inch, and mineral-wool cores trade some R-value for a fire rating. Thicker panels give a higher total R-value, so Universal Steel sizes the panel to the temperature your facility has to maintain.
What are the disadvantages of insulated metal panels?
There are a few genuine ones. Insulated metal panels cost more up front than a faced fiberglass system and are made to order, so they suit buildings where tight temperature control justifies it. You cannot easily run plumbing or wiring through a panel, a panel cut in the field can compromise its coating, and moisture can get in if a joint is sealed poorly. The steel faces can also dent if handled roughly. Most of those are problems of fitting panels to a building after it is built. Because Universal Steel engineers the panels, the openings and the service routing into the building from the start and installs them as part of the build, those drawbacks are designed out rather than discovered on site, and a mineral-wool core is available where a fire rating is needed.
What are insulated metal panels used for?
They are used wherever the interior temperature has to hold against the outside. Cold storage and refrigerated warehouses, food and beverage processing, pharmaceutical and distribution facilities, clean rooms and controlled environments all rely on the continuous insulation and the sealed, washable interior face. The continuous core keeps energy use down and conditions stable. For buildings that only need basic comfort, a faced fiberglass system is usually the more economical choice.
Are insulated metal panels the same as sandwich panels?
Yes. Sandwich panel is another name for the same product, describing how it is built: two steel faces with an insulating core sandwiched between them. You will also see them called IMPs. Universal Steel uses all three terms for the same factory-foamed panel system.
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We engineer panels, insulation and accessories into the building as one system, shipped from the closest plant.