Strength and durability are two factors that architects and builders prioritize when selecting sandwich panels. Metal sandwich panels boast great strength and superior impact resistance, making them some of the most coveted panels.
However, finding the right ones is not as easy as it sounds. This article, however, seeks to make your shopping experience easier by discussing the best metal sandwich panels in today’s market.
What is a Meta Sandwich Panel?
Metal sandwich panels are pre-assembled and multi-layered building sheets often utilized in construction to clad roofs and walls. They also feature prominently in cold storage thanks to their excellent thermal insulation capabilities.
They consist of outer layers made of metal, particularly aluminum or steel, sandwiching an inner core made of EPS, rock wool, or glass wool, amongst other filling materials. This gives them their characteristic low weight, making it easier for you to install and handle them.
Types of Metal Sandwich Panels
1. Expanded Polystyrene Metal Sandwich Panels
EPS sandwich panels typically feature galvanized steel as the outer layers and cellular plastic foam, which is essentially 98% air in their structure. The outer metal layers contribute to the exceptional strength demonstrated by these panels, while the plastic foam core contributes to their impeccable thermal and acoustic insulation. They primarily thrive in cold rooms and walk-in freezers, thanks to their superior insulation capabilities.
Advantages
- Immune to mold growth and rotting since they are water-resistant
- Great thermal insulation
- Impeccable acoustic insulation
- Relatively lightweight thanks to their cellular plastic foam core
- Easy to clean
Disadvantages
- Prone to melting in case of a fire
- Not ideal for applications requiring high load-bearing capacities
- Pests such as rodents can hide inside the inner core material
2. Polyurethane Metal Sandwich Panels
These composite panels consist of two metal facings layering polyurethane foam filling on either side. The facings are typically made from aluminum or galvanized steel, giving these panels great structural strength. The PU filling, conversely, contributes to their impressive thermal insulation, making PU sandwich panels the preferred option for construction applications prioritizing thermal insulation.
Advantages
- Quite strong despite being lightweight
- Superior thermal insulators
- Easy to install and clean
- Smooth and aesthetically pleasing surface
- Demonstrates great resistance against moisture
Disadvantages
- If burnt, they can emit poisonous fumes
- Limited fire-resistance
- Not as effective at dampening noise or sound
- Can be quite expensive
3. Honeycomb Metal Sandwich Panels
Honeycomb metal sandwich panels are extraordinarily stiff building materials utilized in the construction of aircraft floors and other architectural applications. They are revered for their superior strength-to-weight ratio, which is brought about by their unique structure. They feature a honeycomb core sandwiched by high-strength sheets on either side. The inner core is often made from steel or aluminum, and in some instances, titanium.
Advantages
- Great energy absorption
- Maintains its structure even under heavy loads or pressure
- Great at dampening sound/noise
- Excellent corrosion resistance
- Very stiff
Disadvantages
- Quite expensive to produce
- Relatively difficult to repair
- The outer surface can break down under extreme stress
4. Extruded Polystyrene Sandwich Panels
Extruded polystyrene panels boast a closed-cell makeup, which contributes to a tougher and stiffer structure. They are manufactured through extrusion, meaning that their cell structure remains uniform, contributing to superior thermal resistance. They are also impervious to moisture, making them perfect for applications subjected to fluids and vapor, such as cold storage.
Advantages
- High R-value
- Impervious to rotting and mold growth
- Perfect for humid environments due to its excellent water resistance
- Can tolerate relatively weighty loads
- Hardly sags or loses structural integrity
Disadvantages
- Can expand under high heat
- Necessitates the injection of fire-retardant additives
- Costs more than other metal sandwich panels
5. Glass Wool Sandwich Panels
Glass wool metal sandwich panels feature prominently in applications prioritizing acoustic insulation and fire resistance, such as power plants. This is mainly because they consist of a non-combustible core with a fibrous structure. This helps regulate the level of noise passing through as well as block heat exchange. The fiberglass core is typically covered by metal sheets, preferably pre-painted or galvanized steel, which protects the core and boosts the panel’s impact resistance.
Advantages
- Ideal for high-temperature use
- Excellent thermal insulation
- Great sound dampening
- Relatively affordable
- Immune to fires
Disadvantages
- Relatively heavier
- Reduced structural strength
- If improperly sealed, it can absorb moisture, leading to moisture growth
6. Polyisocyanurate Sandwich Panels
PIR metal sandwich panels are multi-layered construction sheets made up of twin metal facings sandwiching a polyisocyanurate core. This foam-based core boasts a closed-cell structure, meaning that these panels have superior structural rigidity.
The core material is often reinforced to improve thermal efficiency and enhance fire resistance. As such, polyisocyanurate metal sandwich panels do not melt when subjected to flames. They instead char, making them ideal for kitchen walls and roofs.
Advantages
- Extremely low thermal conductivity
- Low smoke emission
- Improved fire performance
- Self-extinguishing
- Self-supporting
- Rapid installation
Disadvantages
- The core is prone to UV degradation
- Relatively low compressive strength
- Constrained service temperature
7. Wall Metal Sandwich Panels
Wall metal sandwich panels are tailor-made for cladding vertical walls in residential structures, commercial buildings, and industrial facilities. They are designed to offer a balance between functional performance and aesthetics. The vast majority of them have an insulating core bonded to metal facings on either side. Their thickness ranges between 30 and 150 mm, depending on the application’s demands.
Advantages
- Minimized foundation loads
- Improved thermal insulation
- Low maintenance
- Comparatively cheaper than traditional walls, especially brick walls
- Excellent acoustic insulation
Disadvantages
- The core might degrade if continually left exposed to moisture
- Limited fire performance
- Can suffer dents
8. Roof Metal Sandwich Panels
These are weatherproof roofing materials comprised of metal facings shielding an insulated core. The vast majority of roof sandwich panels come fitted with interlocking side joints, making it easier for you to install them. Their inner core can be made from numerous materials, key amongst them being PUR and mineral wool. This core determines their thermal and acoustic insulation. Some are reinforced with anti-condensation features, making them perfect for use in extremely cold regions.
Advantages
- Airtight
- Weatherproof
- Rapid installation
- Enhanced thermal efficiency
- Lightweight
Disadvantages
- Condensation risk
- Can allow the passage of rain noise
- Relatively higher upfront cost
9. Fire-Resistant Metal Sandwich Panels
Fire-rated metal sandwich panels are designed to curtail the spread of fire in the event of an outbreak, consequently minimizing damage. They are ideally made from fire-resistant materials such as rock wool and polyisocyanurate. Depending on the material used, fire-resistant metal sandwich panels can resist fires for up to 240 minutes, making them perfect for environments or buildings prone to fires, such as kitchens and power plants.
Advantages
- Non-combustible
- Guarantees fire resistance for 30-240 minutes
- Great sound dampening
- Reduced toxic smoke emission
- Excellent thermal insulation
Disadvantages
- Relatively heavier
- Sensitive to moisture
- Relatively costlier
Comparing Metal Sandwich Panels
| Feature | Mineral Wool | EPS | PUR | Honeycomb | Glass Wool |
| Thermal Insulation | Great. | Excellent. | Relatively lower. | Good. | Excellent. |
| Weight | Relatively heavier. | Extremely lightweight. | Very lightweight. | Extremely lightweight. | Medium-lightweight. |
| Fire Resistance | Non-Combustible. | Relatively low. | Moderate. | Moderate. | Excellent. |
| Structural Strength | Moderate. | Moderate. | Very rigid. | Very strong. | Fair. |
| Sound Dampening | Excellent. | Relatively poor. | Moderate. | Poor. | Great. |
| Cost | Relatively high. | Quite cheap. | Fairly high. | Relatively high. | Moderately high. |
Which is the Best Metal Sandwich Panel?
The decision on the best metal sandwich panels for your specific project boils down to your project’s demands. For instance, if you are looking for a budget-friendly option for your warehouse, EPS metal sandwich panels would be perfect. However, if your project demands enhanced safety against fire, mineral wool panels would be better suited.
FAQs
What are the advantages of sandwich panels?
Sandwich panels have a unique yet reinforced structure, making them a superior construction material. As such, they promise a myriad of rewards, including;
- Great structural strength despite being lightweight.
- Improved thermal insulation.
- Aesthetically pleasing surfaces.
- Impressive load-bearing capacities.
Can metal sandwich panels resist fire?
Metal sandwich panels, particularly those with a mineral wool core, are rated as non-combustible, while those with a polyisocyanurate foam core boast great fire-tolerance.
What is the standard thickness of metal sandwich panels?
Quite often, the ideal dimensions of metal sandwich panels are determined by their designated application. For instance, standard panels for partitioning internal walls come in thicknesses ranging from 30mm to 50mm, while panels destined for cold storage demand a thickness of at least 100mm.
Can you use metal panels for roofing?
Yes. Metal sandwich panels thrive as roofing materials since they promise great weather resistance and thermal insulation. However, they must be tailored to withstand the harsh conditions that come with outdoor use.
Why Partner with Lutonpanel
At Lutonpanel, we offer many sandwich panels designed for specific application requirements. Whether you are looking for expanded polystyrene metal sandwich panels, polyurethane metal sandwich panels, or glass wool sandwich panels, Lutonpanel offers a wide range of custom solutions.
Tell us more about your project today, and our engineers will advise on the best panel for your project – Talk to our sales team now.
