Helios B² of Dome Solar — Certified PV mounting system for industrial roofs Trapezoidal sheet metal

Trapezoidal sheet metal and sandwich panels: Helios B² technical specifications

Helios B² is the reference system for installing photovoltaic panels on pitched roofs with dry roofing. It adapts to two types of support:

• Trapezoidal sheet metal with trapezoidal profile (dry roofing) — direct fixing into the purlins via the tray screws, without additional drilling, maintaining watertightness

• Sandwich panels — solution validated by ATec for this specific application

Certified by a Technical Opinion (ATec) from the CSTB , the system is part of the Green List of the Product Prevention Commission (C2P) of the AQC — a prerequisite for insurance coverage of professional construction sites.

Key technical points for sizing:

• Transfer of forces directly into the load-bearing structure (building beams)

• 92 mm ventilated air gap between cover and module → thermal control, increased production

• Clippable steel rail, factory pre-mounted wedge: installation can be started at any point (top, middle or bottom of generator)

• Installation of the support brackets can be carried out simultaneously with the installation of the trays by the roofing company → reduction of the PV installer's intervention time

• Clamps available in silver and black (black finish FIN079/FIN080 for aesthetic integration)

Professional application areas

Helios B² is designed for industrial and commercial projects where the Trapezoidal sheet metal is the dominant medium. The most frequent usage contexts are:

• Agricultural sheds and livestock buildings — pitched roofs in Trapezoidal sheet metal , metal frame, generators from 30 to 500 kWp for self-consumption or as required by the APER law

• Logistics warehouses and industrial buildings — large span roofs, wind and snow load constraints (DTU standards), energy bill reduction (C&I)

• Commercial buildings (offices, shops, public access buildings) — specifications from design offices, insurance requirements imposing ATec and C2P Green List

• Roof renovation with simultaneous PV installation — optimized construction costs thanks to roofer/PV installer interoperability

Since July 2023, the APER law has mandated the progressive installation of photovoltaic panels in new parking lots and commercial buildings larger than 500 m². For new or heavily renovated industrial buildings, the roofing Trapezoidal sheet metal combined with a certified system like Helios B² directly meets this obligation.

Why order the Helios B² from POwR Connect

POwR Connect is an exclusive B2B distributor reserved for PV professionals.
Regarding the Helios B² range:

• 20 items available in stock : 3PV and 4PV rails, brackets, silver and black clamps, Screws T25, inter-wave spacers, EPDM seals, exterior finishes

• Dome Solar × POwR Connect range quote form available directly from the product sheets or the range page

• Assembly instructions (FR/EN) available for download + brochure and technical data sheet Dome Solar accessible

• Access pricing and ordering after logging into your professional account — prices excluding VAT, delivery within mainland France

• Technical support available Mon.–Fri. 8:30am–12:30pm / 2pm–6pm for module sizing and compatibility

FAQ — Helios B² fixing Trapezoidal sheet metal

What types of Trapezoidal sheet metal are compatible with the Helios B²?
The ATec 21/15-53 of Dome Solar Covers trapezoidal profile trays. The modules have been generically defined since 2022 — compatibility no longer depends on a limited list of manufacturer references.

Does the Helios B² require an additional perforation of the tray?
No. The steel profiles are fixed using the existing screws of the roof deck, which preserves the roof's watertightness and reduces the risk of leaks. This is one of the system's differentiating advantages compared to... Mounting systems with lag bolts.

Is ATec certification sufficient for insurers?
The CSTB ATec certification is a necessary condition, but inclusion on the AQC's C2P Green List strengthens the ten-year warranty coverage. Helios B² combines both—making it eligible for almost all projects where the insurer requires certification.

Can only certain Helios B² spare parts be ordered?
Yes. The range is available by reference — rails, brackets, clamps, Screws Accessories can be ordered separately. Useful for ongoing projects or maintenance restocking.