'Im Zelg' project

Housing, Uster Canton Zurich

At Zelgstrasse in Uster, in the canton of Zurich, an environmentally conscious residential development is being built. Comprising five residential buildings with a total of 164 rental apartments in timber construction, this project will combine modern living with the natural material wood. For the floor elements, the mass timber product CLTPLUS is being used.

Project information

Use: Residential building
Location: Uster in the canton of Zurich
Completion date: 2026
Theurl products used:
approx. 3,500 m³ CLTPLUS

Project partners

Timber construction: Renggli AG
Client:
UBS Sima (UBS Fund Management (Switzerland) AG)
Architecture: Bednar Steffen Architekten AG
Prime contractor: Rhomber Bau AG

The first residential building

The conditions for the first residential building have been established. The basement and stairwell are being constructed using prefabricated concrete elements, significantly reducing the construction time. Between April and the end of June, a total of 691 m³ of CLTPLUS floor elements will be delivered for the floor slabs. For the fourth upper floor, a factory-applied weather protection membrane is installed to protect the elements from moisture on site.

To ensure that all 155 components are delivered just in time to the construction site, the logistical challenge is managed using the company’s own swap trailers.

Storey ceilings with CLTPlus for residential buildings made of wood

An environmentally aware neighbourhood development is being created

The outdoor area combines modern living with a lifestyle close to nature.

A special feature of Zelgstrasse is the sponge city principle. If the root system can develop properly, a tree functions like a sponge. Instead of simply channelling and draining water masses caused by heavy rain or flooding, the trees can absorb and store them locally.

Exterior view of wooden residential building

Solution approach

The new design by Rhomberg Bau AG has resulted in a concept for five buildings with environmentally friendly construction methods and future-orientated technologies. Regarding the timber construction, the aim was to use a system that structurally allows a two-way slab timber construction method. This challenge can be met with our key technology TS3.

Result

The end face joint seal creates frame structures without joists. A primer and assembly sealing tape are attached to the CLTPLUS ceiling element in the THEURL factory. The joints are filled on site. The advantage of this application: flexible and point-supported floor slabs are created without fasteners and bonding pressure.