Isothermal doors

The advantages of different models of isothermal doors

Each model has its own advantages:

Revolving doors are recommended when the thermal differences are large between two areas – airtightness being better achieved by peripheral seals.

Sliding doors are chosen to reduce obstruction in passageways and opening can easily be made automatic.

Swing doors are more adapted to frequently used passages between two areas of similar temperatures.

Service doors – lighter with a variety of facings – they are used for example for access to technical premises, offices, sanitary facilities…

Flexible doors are used for movement between two areas with similar temperatures where there is a high passage frequency or in addition to another opening to limit thermal loss.

Sectional doors


The ISO insulated panels are made in compliance with the “sandwich” principle (steel sheeting – PU foam at a high density – steel sheeting). The foam, at a high density, doesn’t contain CFCs and has excellent insulation, acoustic and thermal properties. The sheets of steel have been galvanized on both sides and then coated with a layer of primer. This quality product resists bad weather and corrosion. We have made no compromises in the choice of materials, thickness of the sheets and type of PU foam used. The panels are supplied in compliance with the label of quality RAL GZ 617 “Gütesicherung”


The sections (panels) for the ISO insulated sectional doors are available in 3 different heights and in the most used RALs. The heights were carefully selected in order to avoid cutting the panels. The heights available are 488mm, 610mm and 732mm.


When bright lighting with natural light or vision through the steel shutters are desired, glass ALU sections offer the best performance. Unlike the structures made manually, the main European factories which make the sectional doors industrially are able to develop and make glass ALU sections of a very high quality, thanks to modern machines with digital commands. This means that the solutions they propose are far superior in terms of natural light, assembly and also in resistance to attempts to break in. We also offer double-glazed vision panels for ISO insulated steel shutters. The ISO vision panels can be supplied from a wide range of forms and dimensions according to your choice.

The choice of the position of the vision panels in the steel shutters of an ISO insulated sectional door depends on 4 different criteria:


1) Necessity for natural light

The necessity to have natural light at your disposal influences the position and number of vision panels used. It is often preferable to use glass ALU sections which are entirely transparent when a lot of light is required.

2) Thermal properties

If thermal insulation (insulation performance/U value according to EN 12428) is the most important criterion when you choose, double-glazed vision panels are the best choice for you.

3) Prevention of breaking and entering

If maximum prevention of breaking and entering is your main criteria then double-glazed vision panels of reduced height is the best choice for you.

4) Design

Round, double-glazed vision panels can be fitted randomly in the insulated metal shutter.

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Isothermal Panels

The construction of refrigerated premises demands a judicious choice and adequate installation of the isothermal panels which will form them.

Criteria in the choice of isothermal panels

The criteria which are taken into account depend on their use; Wall – Ceiling – Partitions – Negative floors. As well as specific thermal needs of the different operation areas; Refrigerated warehouses or controlled atmosphere – Food-processing premises.

In the area of food-processing, isothermal panels are recommended for the construction of the simple cold room of a caterer, to the refrigerated enclosures of the biggest companies with thermal constraints which can go from simple refrigeration to freezing.


Cases of isothermal panel use

 Les exemples de construction qui peuvent êtres particulièrement cités sont les suivants :

Thickness of isothermal panels

The thickness of the panels can vary from 40 to 220mm with different smooth or ribbed facings with several coatings. The choice of panel thickness must meet the thermal specificities of positive, negative or “hot” cold rooms.

The composition of isothermal panels

Insulation is traditionally made up of polyurethane foam and sometimes of expanded or extruded polystyrene. The demands in matters of security can favor the choice of a core of rock wool in order to comply with a fire rating MO or 1 to 2 hour firewall. The isothermal panel facings. The choice of facings is made by complying with the norms NFP 17-401-1 and NFP 34-301. The facings are made up of ribbed or smooth sheet metal in galvanized steel, stainless steel, lacquered steel PVDF or PET

Isothermal panel coatings

The choice of exterior coatings is made with regard to the ambient atmosphere surrounding the building and for the inside of the buildings it depends on the aggressiveness of the atmosphere, cleaning conditions and the hygrometry (insulation DTU 45-1).

Assembling isothermal panels. The panels have male-female molded edge strips which allow simple or double interlocking depending on the thickness.

Installing isothermal panels

Preferably the installation of the panels must be done by companies which have acquired the necessary Qualibat professional qualifications.

Our teams of highly qualified fitters have carried out numerous projects throughout the French territory and even abroad in the area of food-processing but also in research, beauty care, electronics, aviation, pharmacy, wine and transport.

Firewall panels

Firewall panels for ordinary separation

2-hour firewall panels (material components rated MO = rock wool and plaster firewalls) are used to create a wall to stop fires. This separation is designed to ensure that rescue services can stop the fire spreading. It is necessary to use interlocking panels with walls to stop flames spreading to the junctions. In order to stop the fire spreading to the outside of the building, a roof overhang is often recommended (see following paragraph). The use of panels has the advantage of combining protection from firewalls with airtightness and insulation.

Firewall panels for building separation

In the case of a separation of certain types of buildings or different parts of a construction, regulations or insurance companies can insist that firewalls stay in place to play their role, even if a part of the building collapses.

In this case the main walls must be 4-hour firewalls (concrete structures).

For these walls a roof overhang and also a lateral overhang are compulsory if the roof and the panels which contain the façades are not 2-hour firewalls and M0.

If the firewall panels are installed as frontage they must be fitted on an independent, auto-stable Framework.