Sandwich panels and thermal panels

Sandwich panel vs. thermal panel – the difference:

In practice, the word “thermal panel” has become established to describe a sandwich panel whose insulating material in the middle (core) is polyurethane foam (PUR). For the purposes of this article, only the polyurethane foam thermal panel is commented on below as it is the product that our company offers.

What is a thermal (sandwich) panel?

A sandwich panel/thermal panel consists of two layers of steel sheets (sheets) with insulation material in between. In rare cases, thinner thermal panels (10 mm to 25 mm thick) are produced, where the bottom layer of the sheet metal is replaced by a foil, the purpose of which is easier installation and a more affordable price.

The sheets making up the outer layer of a thermal panel can be manufactured in different thicknesses. The density of the polyurethane foam can be varied. It is a rule that the thicker the sheet and the denser the polyurethane foam, the more durable the panel becomes, its insulation properties increase, but, naturally, this leads to an increase in the price of the final product.

The most common colour of the thermal panels is dark-white or the so-called “dirty-white” (RAL 9002). The production of a different colour generally has an impact on the price of the final product.


Thermal panels are widely used in the construction of various objects. Easy and quick installation, high efficiency and affordable price are the main factors when choosing thermal panels. The construction of objects with sandwich panels has become extremely popular over the years. Both the contracting authorities and the contractors on bilateral contracts are doing much more work in short periods of time, at a currently unbeatable price, saving more on energy and physical labour.

Sandwich panels are widely used in the construction of various sites.


Thermal panels are produced in various lengths – most commonly in sheets 13.50 metres or 15 metres long, the aim being easier and cheaper transport. In width, the standard is 1 linear metre (actual roof-covering area, i.e. the area that the panel will de facto (in practice) cover). Panels of different lengths are made on request.


As a rule, two main types of thermal panels are available in terms of their application – roof panels – for the construction or insulation of roofs, and wall panels – for the construction and insulation of walls. Roof panels are manufactured with so-called ‘ribs’ or ‘corrugations’ along the length of the thermal panel which give the panel extra strength and thus make it more difficult for water to be retained on the roof. “The ‘ribs’ or ‘corrugations’ can be several in number – the most common thermal panels are manufactured with 3 or 5. The wall thermal panels have a smooth relief with very thin grooves along their length (about 1 mm), the aim again being extra strength as well as easier water drainage.

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