The best-selling ATec certified photovoltaic mounting system in France

Helios B² is a photovoltaic mounting system for installing photovoltaic panels on pitched roofs. It can be adapted to buildings that either have an uninsulated roof deck (steel deck with trapezoidal profile) or a sandwich panel roof. Helios B² is certified by a Technical Approval (ATec) from the Scientific and Technical Centre for Building (CSTB). It is on the Green List of the Product Prevention Commission (C2P) of the Construction Quality Agency (AQC).

The advantages of HELIOS B²

Advantages of the system

A photovoltaic module fastening solution that is fixed into the building's load bearing structure

This mounting system is sturdy and reliable. Helios B² allows the load to be supported by the load-bearing structure by being fixed directly in the roofs purlins. The steel rails are attached using the roof deck screws to avoid additional perforation. Dome Solar solution therefore reduces the risk of water infiltration by ensuring optimal watertightness of the roof.


Solar panels installed in the blink of an eye

Installation time is optimised thanks to support clips which can be fitted by the roofing company at the same time as it lays the deck. This leaves only the steel rails to be clipped on, and the photovoltaic panels to be installed. Thanks to pre-assembled spacers on the rail, the installation of the solar modules can start in the location of your choice – at the top, middle or bottom of the generator, which is a major advantage.

The efficiency of your photovoltaic panels

Thanks to the installation process of Helios B² system there is considerable ventilation under the solar panels. With an air space of 121.5 to 145.5 mm between the roofing deck and the solar panel, ventilation is guaranteed.

Documentation & Downloads


PDF brochure

Download the file.


Contact us to request the manual.


Contact us for certification.

Technical data

USE New roof, total or partial renovation
Distance between purlins: 2 m on 0.75 uninsulated roof deck and sandwich panels and 1.8 m on 0.63 uninsulated roof deck (possible to provide calculations for any project outside the scope of use)
TYPE OF ROOF Standard steel deck and sandwich panel
SUPPORTING STRUCTURE Metal or wooden frame
SYSTEM COMPONENTS Steel rail, steel rail support + EPDM seal and aluminium clamp


Helios B²

The Helios B² system from Dome Solar is a solution for mounting photovoltaic panels on trapezoidal sheets and sandwich panels.
This solution is certified by a Technical Approval (ATec) and a New Technology Survey (Enquête de Technique Nouvelle – ETN).