Walls & Roofs · High-R Construction
Factory foam-core walls and roofs when you need high-R and a finished interior.
Why IMPs
An insulated metal panel is two steel skins bonded to a rigid foam core. One product gives you exterior finish, insulation, vapor control, and interior finish — higher continuous R-value than a field-layered blanket in many jobs.
Choose IMPs when energy code, air sealing, and a finished interior matter as much as first cost.
Steel skins + rigid foam core + interlocking side joint — the IMP sandwich
Construction Specs
26-gauge is the typical interior and exterior skin. 24-gauge is available as an option on either or both faces for higher impact resistance, longer spans, or more demanding exterior exposure.
Specify 24 ga where abuse, wind, or aesthetics demand a heavier skin.
Exterior colors are offered in silicone polyester (SMP) for everyday commercial performance and PVDF / Kynar® for premium chalk and fade resistance on high-visibility projects.
Wide color range — match brand, site context, or energy-code cool-roof strategies.
White is the preferred interior finish — reflects light, brightens workspaces, and supports cleanability. When specified with appropriate facings and details, IMP systems can meet USDA requirements for food processing and cold storage environments.
Confirm food-facility / wash-down details on your project quote.
Thermal Performance
Foam cores typically deliver about R-8 per inch. Thicker panels = higher continuous R for code-driven and conditioned buildings.
| Core thickness | Typical R-value* | Approx. U-factor | Common use |
|---|---|---|---|
| 2″ | R-16 | ~0.063 | Light commercial, unconditioned / mild climates |
| 2½″ | R-20 | ~0.049 | Shops, warehouses stepping up from thin cores |
| 3″ | R-24 | ~0.041 | Popular conditioned commercial wall package |
| 4″ | R-32 | ~0.031 | High-R walls, offices, retail, energy-code zones |
| 5″ | R-41 | ~0.024 | Cold storage edge cases, strict energy targets |
| 6″ | R-49 | ~0.020 | Maximum wall thermal performance |
| Core thickness | Typical R-value* | Approx. U-factor | Profile notes |
|---|---|---|---|
| 2½″ | R-21 | ~0.050 | High-rib options common at this thickness |
| 3¼″ | R-26 | ~0.038 | Standing seam IMP packages |
| 4″ | R-33 | ~0.031 | Workhorse high-R standing seam roof |
| 5″ | R-42 | ~0.024 | Strict energy-code / conditioned roofs |
| 6″ | R-50 | ~0.020 | Maximum roof thermal performance |
*Typical industry values for polyurethane/polyisocyanurate foam-core IMPs (~R-8/in). Exact R and U depend on core chemistry, testing standard (e.g. ASTM C518 / ASTM C1363), and joint details. Weathertight standing-seam warranties are manufacturer-specific — confirmed on quote.
Looks & Geometry
Wall and roof faces are available in multiple exterior profiles so the building reads architectural, industrial, or pure utility — without sacrificing the foam-core thermal envelope.
Smooth modern face for offices, retail, and architectural elevations.
Subtle ribs reduce oil-canning and add texture — the most common commercial look.
Fine vertical texture for architectural walls and brand-forward facilities.
Raised seams with field or mechanical seaming — weather-tight warranty path for high-performance roofs.
Deep ribs for spanning and drainage on industrial and long-bay roofs.
Thicker cores and specialized joints for freezers, coolers, and interior partitions.
Roof Systems
Insulated standing-seam roof panels combine a high-R foam core with a seamed exterior that can qualify for weather-tight warranties when installed to manufacturer requirements. Ideal when energy code and long-term roof performance both matter.
Both have a place — we help you pick based on code, use, and budget.
| Factor | IMP (this page) | Field panels + insulation |
|---|---|---|
| Continuous R | Excellent — foam core spans the full panel | Good with multi-layer systems; compressed at purlins |
| Typical R range | R-16 to R-50 by thickness | R-10–R-19 single layer; R-25–R-38+ multi-layer |
| Interior finish | Factory white steel skin (USDA-ready options) | Faced blanket, liner fabric, or liner panel |
| Install speed | Fast enclosure — one product for wall/roof shell | More field layers and trades |
| Best when | Energy code, conditioned space, food/cold storage | Economy shops, barns, simple storage PEBs |
Also see our fiberglass insulation systems and exposed-fastener panel profiles.
Tell us wall vs. roof, thickness or R-value, and finish. We’ll quote the envelope.
Get a QuoteWalls, roofs, or a full envelope.