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On the warehouse with a roof area of 30,000 sqm, the flat roof insulation “Durock” ensures an excellent heat, sound, fire protection. Because of “Megarock”’s high point load capacity, the insulation boards were applied on parts of the roof area which are especially under pressure due to footpaths and a photovoltaic system of 500 sqm surface.

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ROCKWOOL Mineralwoll GmbH & Co. OHG
ROCKWOOL Strasse 37-41
DE-45966 Gladbeck

Telefon: +49 2043 408-0
Kontakt: Andreas Gebing


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Hoberg & Driesch GmbH

*(ro-en) project_contractor*

ARGE „Frauenrath – Imtech BV Hoberg & Driesch" (A. Frauenrath BauConcept, Heinsberg und Imtech Deutschland GmbH & Co. KG Niederlassung Kassel)

*(ro-en) project_external_links*

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Planned and executed in a sustainable way lasts longer

One of the leading European wholesale firms for steel tubes, Hoberg & Driesch, established its company headquarters on a former area of the Mannesmannröhren-Werke GmbH in Düsseldorf-Rath. A warehouse with its own railway connection and a usable space of 30,000 square meters found a place here just as much as did a representative administration building.  The company's own photovoltaic system, which is installed on the flat roof of the hall, and whose weight is reliably carried by a special roof construction, partly ensures the energy supply in the warehouse and in administration.

The general contractor ARGE "Frauenrath - Imtech BV Hoberg & Driesch" ensured the smooth operation of the individual trades through coordination at the interfaces. Especially a detailed planning in the forefield ensured the later, sustainable efficiency of the entire flat roof construction. Only an exact execution and layout plan, which was developed by the planning office according to the installer's specifications, enabled the realization of the different roof sections. The unused roof area of close to 29,000 m2 was mounted with pressure-resistant stone wool insulation boards in two-layer characteristic and was sealed with a two millimeter thick synthetic sealing membrane. However, for around 900 m2 of the roof area, the responsible company Bernd Baltes Bedachungen from Wegberg chose a roof structure with higher load capacity: "Especially the access routes and of course the 500 m2 large area with the directly set-up solar system were and will be subjected to higher impacts during the installation and in the future.  Alone the 20 kW photovoltaic system set up on the roof construction is burdening the roof area point by point with around 150 kg", says project manager Andreas Erbelding. Simultaneously, according to the tender, the entire roof area should carry insulation materials of Euro-class 1 due to fire-protection regulations. The decision was therefore made for the roof insulation panel "Megarock" from the stone wool manufacturer Deutsche ROCKWOOL. 

High impact and simple processing

Through the connection of a very compact, pressure resistant stone wool insulation material with a fiber-reinforced inorganic covering, the resistance of the "Megarock" boards is  increased, especially regarding point loads. "The roof construction in areas of higher load capacity however only differs minimally from the remaining area. The integration in the building process was therefore very easy. We first rolled a 0.2 mm thick PE foil onto the trapezoidal profile, the "Megarock" boards were directly laid on top of it in a bond formation at a thickness of 100 mm. Between the insulation material and the PVC-P sheet, which were fastened together mechanically, we also laid a raw glass fleece as a separating layer. The raw glass fleece eases the board transition from the surface of the soft to the hard insulation material and prevents a possible plasticizer migration of the PVC- P sealant. This could otherwise occur during direct contact with inorganic components, like concrete or aerated concrete, for example". The cutting of the "Megarock" boards in edge areas is done with a simple handsaw.

Unhindered water drain ensured

The maintenance routes only needed to be made noticeable by an additional roof sealing, which differs from the roof area in color. More extensive, load-distributing measures such as the laying of concrete slabs were not necessary. This way, no further build height was created, so that during heavy rain falls, unhindered water drainage is ensured.

The roof structure built in Düsseldorf, resistant to compression of up to 80 kPa compressive stress and fatigue resistant to > 1,800 N, fulfills the requirements made towards it without a problem. With its heat-insulating characteristics, it makes a substantial contribution towards minimizing the operating costs for the new company headquarters.