Select Cold Storage Sandwich Panel Suppliers With Confidence in 2026

By Alexander Hamilton|September 8, 2026|7 min read

For a -20°C cold-storage project, select a supplier by matching the panel core, thickness, tested fire performance, thermal documentation and installation support to the whole enclosure, not by comparing panel quotes alone. Ask for declared thermal values, assembly-specific fire certifications, structural assumptions and joint details; for freezer walls and ceilings in covered U.S. walk-ins, R-32 remains the federal minimum.

That sounds rather less romantic than choosing a finish colour (the finish colour will have its moment), but it prevents the expensive sort of surprise: a panel that looks excellent on a quotation and becomes a very complicated wall once moisture, heat flow and fire documentation arrive. The sensible brief is not “send your best panel.” It is “show how this exact assembly meets this exact room.”

What is the best core material for sandwich panels in freezer rooms?

For freezer rooms, the best core material is the one that meets the project’s thermal target, fire-performance requirement, operating temperature and assembly details with published evidence; there is no single best core for every project. PIR is often the performance-led choice where thermal efficiency and documented fire behaviour are central, mineral wool is the published non-combustible-class option in the supplied catalogue, and EPS requires particularly careful assessment of the application and fire documentation.

Paneltech’s 2026 technical catalogue makes the useful, unglamorous point plainly: the core should be selected for its requirements and application. Its listed reaction-to-fire classes are A2-s1,d0 for mineral-wool panels, B-s2,d0 for PIR and E for EPS. The same catalogue identifies a PIR cold-room panel for warehouse interiors down to -25°C, while also directing specifiers to consider thermal transmittance, fire resistance, mechanical strength and facing corrosion resistance.

Material labels are not certificates, though. FM Global’s fire-performance research distinguishes PIR and phenolic foam as charring thermoset polymers from EPS, a melting thermoplastic polymer that can form a pool fire during a fire event. It also notes that PIR and phenolic foam provide higher R-values per unit thickness than mineral wool. That is a trade-off map, not permission to select from a brochure with one finger and a coffee in the other.

Core option	Who it suits, based on published information	Published cost comparison	Key limitation or verification point
PIR	Cold-room projects needing a Paneltech panel stated for interiors down to -25°C, or a supplier system with published low thermal conductivity.	Not published	Paneltech lists B-s2,d0 for its PIR panels; verify the exact assembly and thickness.
Mineral wool	Projects prioritising the A2-s1,d0 reaction-to-fire class published by Paneltech.	Not published	FM Global states PIR and phenolic foam have higher R-values per unit thickness than mineral wool.
EPS	Projects where the supplier can demonstrate required thermal, structural and fire performance for the specific enclosure.	Not published	Paneltech lists class E for EPS; FM Global says EPS can melt and form a pool fire in a fire event.
PUR	Metal sandwich-panel assemblies; FM Global notes these generally use PIR or PUR between galvanized steel facings.	Not published	Published performance for the proposed assembly must be requested; the supplied sources give no universal PUR ranking.

How do I find reliable sandwich panel suppliers for a large cold storage project?

Find reliable suppliers by requiring a project-specific evidence pack before award: product data, declared thermal performance, fire certificates for the proposed assembly, structural assumptions, joint and vapour-control details, facing specification, warranty terms and installation requirements. A reliable supplier does not make a buyer assemble these answers from cheerful fragments.

Start with the room schedule. The UK Valuation Office Agency’s cold-store guidance says surveys should record cladding type, insulation qualities, design working temperature, age and clear height for every chamber. It also flags moisture penetration and ice buildup as conditions that can force insulation away from walls. Put those same items into the tender schedule, then add door openings, penetrations, floor interfaces and refrigeration loads. Long-term frozen-goods chambers are generally designed for -20°C to -28°C in that guidance, so “freezer” is not enough of a specification on its own.

Issue one common room-by-room schedule, including design temperature and required performance.
Request declared thermal values at the stated conditions, plus proposed thickness and heat-flow basis.
Request fire evidence for the complete panel assembly, not a generic core description.
Request structural calculations and the loading assumptions used for spans, fixings and wind actions.
Inspect the supplier’s joint, seal, vapour-barrier and penetration approach before comparing warranties.
Clarify who supplies accessories, installation instructions and post-installation support.

For the fire file, ANSI/FM 4880 evaluates insulated wall assemblies, including sandwich panels, in large-scale tests. The FM standard describes a 16-foot parallel-panel test using a 360 kW sand burner. For unlimited-height approval in that test, the peak heat-release rate must be no more than 830 kW; assemblies above 1,100 kW fail. Ask what exact configuration the certificate covers, because a certificate with its identity tags removed is not much of a certificate.

Also read warranty language for what it actually retains. Kingspan’s cited cold-store brochure offers a project-specific 40-year guarantee for retained thermal insulation, fire-protection and core mechanical properties, subject to its stated system. That kind of published commitment is useful comparison material, but it is not a substitute for confirming what applies to your project. For a separate look at the technical roles that keep industrial equipment operating after handover, see this maintenance technician career guide.

What thickness of sandwich panel do I need for -20°C cold storage?

For -20°C cold storage, thickness must be calculated from the temperature difference across the enclosure and the planned heat flow, then checked against the governing requirement; do not choose it from room temperature alone. In covered U.S. walk-in freezer applications, the Department of Energy retains minimum R-32 wall and ceiling structural panels and R-28 floor panels, while supplier guidance shows that freezer thickness recommendations vary by panel system and duty.

The U.S. Department of Energy’s 2024 final rule defines a walk-in freezer as an enclosure at or below 32°F with less than 3,000 square feet of chilled storage area. It establishes standards for the principal components: doors, panels and refrigeration systems. Its R-32 wall-and-ceiling minimum is a compliance floor for the specified class, not a magic thickness that transfers automatically to every industrial facility.

Supplier data makes the difference visible. Bondor recommends EPS-FR panels of at least 150 mm for freezers and at least 200 mm for blast freezers, subject to structural design and required R-value. Its published 150 mm total R-value is 4.03 m2K/W at 6°C, rising to 5.31 m2K/W at 200 mm. Kingspan, meanwhile, states that its thickness selection depends on the temperature difference between outer and inner panel surfaces and planned heat flow. Same question, different system inputs. This is why a thickness request without a calculation basis is the quotation equivalent of a shoelace: present, but not doing enough work.

Before approving the selection, obtain the supplier’s calculation for each chamber and verify the stated ambient conditions, internal temperature, panel conductivity, joints, doors, floors and penetrations. Then make sure the proposed solution addresses condensation and vapour control, because the cold-store guidance identifies moisture and ice as serviceability risks. Choose the evidence first; let the millimetres follow.

Frequently Asked Questions

Are PIR panels worth the higher cost over EPS for industrial roofing?

The supplied sources do not publish a direct PIR-versus-EPS industrial-roofing price comparison, so a universal premium cannot be calculated. FM Global says PIR provides higher R-values per unit thickness than mineral wool and describes EPS as a melting thermoplastic that can form a pool fire; Paneltech lists B-s2,d0 for PIR and E for EPS. The decision should therefore compare the required thermal performance, fire documentation and full assembly scope, not core price alone.

Which sandwich panel suppliers offer the best fire rating certifications?

The sources document different published classifications rather than ranking suppliers. Paneltech publishes A2-s1,d0 for mineral-wool panels, B-s2,d0 for PIR panels and E for EPS panels, while Kingspan's cited cold-store literature declares B-s1,d0, EI60 suitability and an FM 4882 low-smoke classification for its QuadCore system. Ask every bidder for the certificate covering the exact panel assembly, thickness, facing and intended application.

How do sandwich panel prices compare between European and Asian suppliers?

The supplied public sources do not publish comparable European and Asian supplier prices, freight terms or like-for-like specifications. FM Global cautions that insulated metal sandwich panels are comparatively more expensive than other continuous-insulation materials and says comparisons should normalize performance, fire testing and assembly scope. Request a common bid schedule, then separate panel price from accessories, delivery, installation support, warranty and tested certification.