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Types of Thermal Insulation with Sandwich Panels

When we talk about thermal insulation, we refer to materials used in construction characterized by their high thermal resistance, establishing a barrier to the passage of heat between two mediums that would naturally tend to equalize in temperature.

Next, we will focus on explaining why insulating materials are necessary and which are the most commonly used.

Which is the Best Thermal Insulator?

The most important data to consider when choosing thermal insulation is its Thermal Conductivity (λ). It is measured in λ = q/grad and represents the ease with which heat energy passes through the material. Therefore, the lower this value, the better.

As a general rule, all thermal insulators have a very low thermal conductivity. A product is considered a thermal insulator when it has a thermal conductivity < 0.05.

Insulating Materials with Sandwich Panels: Quality Insulation for Your Project

At Panel Sandwich Group, we have a team of experts who advise all our clients when choosing the material. All of them with a single objective: to offer products with the best performance on the market.

Next, you can learn about the main advantages of the insulating materials that Panel Sandwich Group recommends so that your project has the best possible thermal insulation.

1. Polyurethane Foam

Rigid polyurethane foam is used both as thermal insulation and acoustic insulation, as well as waterproofing. It includes polyurethane (PUR) and polyisocyanurate (PIR) materials.

PUR polyurethane foams have an approximate conductivity of 0.020-0.024 W/m°C when leaving the manufacturing line. The sheets that protect the panel core increase the impermeability of the gases inside the cellular structure. It is usually applied as a spray, in the form of foam that solidifies, allowing it to coat any nook and cranny.

Also known as foam rubber, it is a porous plastic that can have different characteristics depending on its composition and presentation.

Although it also has properties that allow it to act as an acoustic insulator, it has been used as thermal insulation since the 1960s.

Thermal Insulation with Polyurethane FoamTile Panel with Exposed Polyurethane Foam

Its main advantage is that it guarantees a high level of insulation with a reduced thickness. That is, its insulating capacity is high even if a reduced material thickness is installed.

It is also worth noting that it allows for the formation of a single layer without joints or overlaps, ensuring total watertightness. Additionally, it insulates and waterproofs at the same time, adapts to any geometry, and allows for quick installation without construction, reducing construction and maintenance costs. It also has high resistance and durability and is 100% recyclable.

2. Rock Wool

Also known as mineral wool, it is a material composed of intertwined inorganic filaments to form a fabric. It is a lightweight insulator effective against heat and noise.

As for our Rock Wool Sandwich Panels, it is a fireproof and waterproof product with great durability that contributes to energy savings.

Due to its characteristics, mineral wool is used in residential insulation, but also industrial and commercial. Additionally, it can be used on floors, facades, and roofs of interior and exterior spaces.

Thermal Insulation with Fireproof Rock WoolAssembly of Fireproof Rock Wool Facade

Its main advantage is its durability, as it is estimated to maintain its properties intact for about half a century.

As we mentioned earlier, it also provides excellent fire protection as it is non-combustible and does not generate toxic gases when in contact with flames.

3. Expanded Polystyrene (EPS)

Commonly known as white cork, expanded polystyrene (EPS) is a plastic foam material used for thermal insulation, derived from polystyrene and used in the packaging and construction sector. It is available in rigid sheets, granules for filling, or blocks for flooring, among others.

Thermal Insulation with Expanded Polystyrene Inside Fir Wood Cladding PanelExpanded Polystyrene Inside Wooden Panel Roof

What stands out about EPS is its low conductivity, with an estimated energy savings of 40%, and its main advantages are its cost and resistance to moisture.

4. Extruded Polystyrene (XPS)

It is a rigid thermoplastic foam obtained from polystyrene through extrusion and expansion processes.

Extruded Polystyrene (XPS) stands out for its magnificent mechanical resistance, excellent performance as a thermal insulator, and its protection against moisture.

It is a great ally against moisture since it barely absorbs water and does not need a vapor barrier. Additionally, it has high durability and can be recycled to a high percentage.

Thermal Insulation with Extruded Polystyrene FoamExtruded Polystyrene Insulation Hydrophobic Chipboard Sandwich Panel

Thanks to its easy installation and low maintenance, it is frequently used in the insulation of flat and sloped roofs, facades, and floors.

The main advantage of XPS is that it does not undergo decomposition processes and, as a general rule, has good resistance.

5. Wood Fiber

Wood fiber helps with heat retention during the day to release it at night. This way, it helps to ensure the temperature variation is gradual.

This material is produced by shredding untreated wood waste, which, after certain treatments, is agglomerated and pressed.

Thermal Insulation with Wood Fibers Inside Fir Wood Cladding Sandwich PanelWood Fibers Inside Fir Wood Cladding Panel

In addition to thermal insulation, wood fibers also offer acoustic insulation.

The main advantage of wood fibers is ecological. It is a sustainable material that helps regulate humidity and does not require maintenance. In this sense, wood fiber is perfect: it is produced from wood industry waste using little energy and, after its useful life, it can be reused as fuel.


If after reading this post you still have doubts about which Sandwich Panel offers the best thermal insulation, or if you have any questions, do not hesitate to contact us, and one of our experts will resolve your doubts. You can do this through the contact form on our website or by calling +1 904 512-3122 and one of our sales representatives will answer all your questions.