Looking for the right insulated panel. thickness for your building, cold room or cladding system? This guide breaks down common sandwich-panel thicknesses (from thin architectural boards to heavy cold-store walls), explains what each thickness is best for, and helps B2B buyers choose the correct panel type for thermal performance, fire safety, structural strength and cost. Wherever helpful I’ve mapped common industry practice to real-world uses (walls, roofs, coldrooms, freezers, modular systems) so you can quickly match insulated panel 40mm / 50mm / 60mm / 75mm / 80mm and larger options like 100mm / 120mm / 150mm / 200mm to your project.
Panel thickness is the fastest way to control thermal resistance (R-value/U-value), stiffness, acoustic performance and — indirectly — cost and handling. Thinner panels (e.g., insulation sheet 25mm, sandwich board 30mm) are common for internal partitions and retrofit cladding. Mid-range panels (40–100 mm) balance thermal performance with economy for general buildings. Heavy panels (120–200+ mm) are standard for controlled environments and deep-freeze facilities. For manufacturer-standard thickness ranges and coldstore product options, see leading suppliers and PIR product lines.
· Thermal performance: thicker cores increase thermal resistance (better U-value/R-value), so thicker panels are commonly used for low-temperature coldrooms and freezers.
· Structural & acoustic: thicker panels provide higher bending stiffness and better sound insulation for walls and partitions.
· Fire & safety: the core material (PIR/PU vs. mineral wool/rockwool vs. EPS) strongly affects fire classification—mineral-wool/rockwool panels offer superior fire performance at similar thicknesses.
These trade-offs determine whether you choose a sandwich board 30mm for simple roof/partition use or a coldroom board 150mm / freezer panel 180mm for extreme-temperature storage.
| Panel thickness (mm) | Typical core / product name | Typical uses (examples) |
|---|---|---|
| 25mm – 30mm | thin insulation sheet / insulation board 25mm / sandwich board 30mm | Internal partitions, retro-fit cladding, low-demand roof lining |
| 40mm – 60mm | common PIR/PU cores (insulated panel 40mm / 50mm / 60mm) | External wall cladding for warehouses, general-purpose roof panels, light modular buildings. Popular for economical wall systems. |
| 75mm – 100mm | heavier PIR/PU or mineral wool (wall cladding 75mm / building panel 100mm) | Office & industrial walls needing better thermal & acoustic performance; warmer cold stores (chiller rooms) often start here. |
| 120mm – 150mm | coldroom / fireproof board / composite sheet (insulation board 100mm–150mm) | Chiller & freezer rooms, high-performance building envelopes, fire-rated wall systems. Many suppliers offer 120mm / 150mm options as a standard. |
| 180mm – 240mm+ | heavy coldstore panels (freezer panel 180mm / wall system 200mm+ / metal panel 200mm) | Low-temperature (-25°C and below) freezer stores, blast-cold applications, long-span insulated roofs where very high R-values are required. |
This table reflects common industry offerings and the typical thickness bands you’ll see when quoting panels from major manufacturers.
If you’re buying cold room panel 150mm / 200mm or freezer panel 180mm, consider the target internal temperature:
· Chiller rooms (≈ -5°C to +5°C): commonly use 50–120mm depending on room size and ambient conditions.
· Freezer rooms (≈ -18°C to -25°C): commonly use 120–180mm; very low-temperature freezers and quick-freeze rooms often specify 150–200mm for reliable performance.
(Manufacturers supply exact density and injection specs—always request the supplier’s cold-store design guidance and energy modelling.)
· PIR / PU (polyisocyanurate / polyurethane): high insulation per mm, light, commonly used across 40–200mm panels. PIR usually gives better thermal performance than EPS at the same thickness. Many PIR panels are offered in standard thickness steps (40/50/60/75/80/100/120/150/200mm).
· Mineral wool / rockwool: heavier, excellent fire resistance and acoustic performance — often used where fireproof board / fire-rated sandwich panels are required; available across a wide thickness band.
· EPS (expanded polystyrene): lower cost, used in light-duty applications; requires thicker panels to match PIR performance.
Takeaway: choose the smallest thickness that meets your thermal/structural/fire targets to optimize cost and handling.
· Roof panels (roof panel 80mm etc.): roofs can use slightly thinner panels because heat loss area and insulation targets differ — but for cold rooms and insulated roofing over occupied/temperature-sensitive spaces, move to 100mm+.
· Wall cladding & façades (insulated cladding 60mm / wall cladding 75mm): 60–100mm is common for standard industrial/commercial façades; for fire-rated or high-performance building envelopes choose mineral wool cores and increase thickness to 120–150mm.
· Modular panels (modular panel 50mm): modular systems often optimize for 50–75mm for rapid installation and transport—pick thicker modules only when low temperatures or high acoustic/fire performance are required.
1. Target internal temp & U-value requirement — set the design temperature first (e.g., -25°C freezer vs. +5°C chiller).
2. Core material preference — PIR for thin, high-R panels; mineral wool for fire performance; EPS for low-cost projects.
3. Panel joint & connection — cam-lock or tongue-groove systems affect thermal bridging and hygienic suitability (cam-locks are standard for cold rooms).
4. Facing material & thickness (steel, aluminum, stainless) — stainless or aluminum finishes are common for hygienic/freezer environments.
5. Fire classification & certifications — request datasheets for fire class (B-s2,d0, B2, etc.), insulation density and QA certificates.
· Insulated panel 40mm / 50mm / 60mm — economical PIR panels for warehouse walls and roofs.
· Wall panel 100mm / 120mm / 150mm — mid-to-high performance wall systems for office/industrial envelopes and moderate cold-store rooms.
· Cold room panel 150mm / 200mm, freezer panel 180mm — heavy-duty coldstore panels for deep-freeze applications.
· Thermal board thickness guide / sandwich panel thickness options — use this page as a quick reference when requesting quotes (specify thickness, core type, facing and connection).
Q: Can I substitute a thicker PIR panel for mineral wool to meet fire regs?
A: No — mineral wool has inherent non-combustible properties that PIR cannot match at the same thickness. If fire classification is critical, specify mineral-wool core and request the fire data sheet.
Q: What thickness for a walk-in freezer at -25°C?
A: Many contractors specify 120–180mm panels depending on room size, door frequency and allowable heat gain. Ask suppliers for thermal calculations for your ambient conditions.
· Gather your design targets (internal temp, required U-value, fire class, hygienic finish).
· Request sample datasheets showing core density, thermal conductivity and fire classification.
· Compare quotes from panel manufacturers that list the thicknesses you need (40/50/60/75/80/100/120/150/180/200mm are commonly available).
Tell us the target internal temperature, desired U-value (or location/climate) and preferred core/facing; we’ll return a short spec pack that maps each required thickness (e.g., insulated cladding 60mm, roof panel 80mm, thermal sandwich 80mm) to recommended SKUs and installation notes.
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