Use of R-concrete ECODUR R

In the historic Mainz Customs Harbor, which has been transformed in recent years into a modern district with residential and commercial spaces, the first timber hybrid high-rise building of the state capital of Rhineland-Palatinate is being constructed – the Timber Peak. Construction began in the summer of 2023.

The approximately 45-meter-tall, twelve-story office tower offers spectacular views of the Rhine River and the Mainz Old Town with its award-winning architecture by Sacker Architects. The building meets the highest ecological standards. An area of 8,750 square meters, spacious, flexible, and bright office spaces with natural wood surfaces are being created.

By mid-March 2025, around 4,200 m³ of concrete from the Dyckerhoff ready-mixed concrete plant in Flörsheim had been processed on the construction site. The majority of the concrete used had a consistency of F4 and a strength of C30/37; it was produced with CEM II/C-M (S-LL) 42.5 N (na) and C35/45 with CEM III/A 42.5 N (na).

R-concrete was also used: to date, approx. 400 m³ of ECODUR R with a strength of C25/30 and approx. 430 m³ of ECODUR R with a strength of C30/37 have been used. This concrete with recycled aggregate was used for columns and walls as well as partially for ceilings.

The builder for the building is UBM Development, one of the leading developers of timber construction projects in Europe. Several divisions of the Leinfelden-Echterdingen-based company Köster were responsible for the construction work.

The special feature of the hybrid construction method used here is that wood and concrete together form a stable supporting structure. The modular construction elements are assembled according to a building block principle. The core of the building, which houses the staircase, among other things, as well as the lower floors, which have to be protected against flooding, are built using classic reinforced concrete construction. From the second floor upwards, prefabricated ceiling elements are installed, which rest on solid timber supports. Their upper sides are made of concrete and the undersides of wood, which also form the ceilings.

In addition to an integrative low-energy concept that combines various renewable energy sources such as photovoltaics, geothermal energy and adiabatic cooling (using the evaporative cooling of air and water), intelligent building technology (control of the entire building technology using smart sensors according to current requirements) and a modern mobility concept with e-charging stations for cars and e-bikes, including a sharing service for these vehicles, are also planned. The area's good public transport connections and well-developed cycle paths should also be highlighted in this context. There are even shower facilities for people who will be working in the building later on and who come to work by bike.

It is also worth noting that when the building is dismantled, the valuable timber construction elements can be sorted by material and reused for the manufacture of furniture or for the production of materials such as paper or heating pellets. Composting or thermal utilization of the wood closes the carbon cycle.

With its timber hybrid construction, Timber Peak sets new standards in CO₂-optimized building construction and management. Building automation makes it easier for users to fulfill EU taxonomy reporting obligations almost automatically. Gold certification from the German Sustainable Building Council (DGNB) and compliance with the KfW 40 energy efficiency standard are planned.

Completion is planned for the end of 2025.

Photos: Dyckerhoff

For further information, please contact:
Iris Weise-Rosch, Tel.: +49 611 676-1187
marketing@dyckerhoff.com