Schöck consolidates its expertise in passive construction with more and more labeled references

This fervent defender of the Quality of the Envelope thus multiplies the references in passive constructions, whose reinforced insulation, the treatment of thermal bridges and air tightness constitute the imponderables to optimally prevent heat loss and of energy. Guarantee residents a high level of comfort in all seasons, while respecting the environment through minimal GHG emissions thanks to the low energy consumption for heating and air conditioning (also a source of savings for households): such is the leitmotif that motivates Schöck to favor passive labels.

Solatium Residence in Vandeuvre-lès-Nancy (54) labeled by the French Federation of Passive Construction: 14 rental units intended for the elderly

Implementation of the Schöck Isokorb® KXT (for cantilevered balconies) and QXT (for loggias on supports)

Schöck was involved in the construction of this building bringing together two social programs (25 studios for the Social Reintegration Agency - Myosotis residence - and 14 housing for seniors via Meurthe and Moselle Habitat - Solatium residence -) and signed by the Rolf Matz workshop Architecture, specializing in bioclimatic architecture, passive buildings and eco-construction with high energy performance.

As Lionel Mahuet, General Manager of Meurthe-et-Moselle Habitat, Project Owner, emphasizes, the choice of a design according to the European passive building standard, the Passivhaus label, is nourished "Of a very ambitious environmental approach to preserve natural resources but also of the need to reduce the charges of our tenants, to play down on their energy bill and upward on their purchasing power."

The particularity of this realization turns out to have been previously modeled in 3 D, presenting the advantage according to the architect-engineer Rolf Matz of "Better understand the interaction of the various trades and thus optimize certain positions, as was that of fluids for example". At the end of this 3D study: a very detailed CCTP which enabled companies to respond with precision, to achieve the optimal passive performance targeted.

If the project initially envisaged balconies and passageways in metal structure, Schöck, playing its role of adviser, recommended the use of concrete, ultimately selected. Thus at the level of the loggia wall-slab connections (20 in total), Schöck implemented its structural breakers, the Schöck Isokorb® QXT model. They ensure the continuity of the building's insulation where it would be interrupted by a structural connection between the interior slab and the loggia slab, while taking up the cutting force.

In addition, 28 ml of cantilevered balconies were treated with Schöck Isokorb® KXT breakers.

Note that for these two models of switches, the "XT" range was selected, having an insulating body thickness of 120 mm instead of the traditional 80 mm: a reference already certified by the Passivhaus Institute in Germany.

Thus, the installation of breakers, associated with the performance of certified passive triple glazing pvc joinery (with blackout by adjustable sun shades) and a double-flow VMC, induces an annual heating requirement of 7.47 kWh / m² (much lower than 15 kWh / m2 per year, the first criterion for obtaining the Passivhaus label).

The air tightness test is also exceptional with the passive standard: 0.60 vol / h, or 0.15 vol / h for the Solatium building and 0,14 vol / h for Myosotis.

Technical characteristics of the Solatium residence, coupled with the Myosotis residence

• Sources: Rolf Matz Architecture
• Floor area: 1 m²
• Construction mode: masonry wall concrete structure T
• Air tightness test: 0.14 vol / h
• Heating energy consumption (according to PHPP): 7.47 kWh / m² / year
• Buildings Certified passive by the French Federation of Passive Construction in January 2018

Housing certified by Propassif in Colmar (68): 48 in rehabilitation and 30 in construction, rue du Luxembourg, district of Europe

Installation of Schöck Isokorb® KST (steel-steel junction) and Schöck Isokorb® QS (concrete-steel connection) switches

The residences on rue du Luxembourg in Colmar embody the perfect example of the versatility of Schöck breakers, as efficient in new construction as in renovation, for optimal treatment of thermal bridges with thermal insulation from the outside.

Originally, a typical building from the 60s, distinguished above all by its age: “It was before the PHCCA and the architecture agency DeA architectes Mulhouse decided on an original form of renovation-construction: the bar was split, part destroyed to let the whole breathe, and the whole thing completely redesigned to make way for one of the largest Passivhaus complexes in France " explains Propassif.

Thus, in the renovated part as in the new part, more than 180 Schöck Isokorb® type KST, KST-ZST and KST-QST breakers (taking, according to their provisions, the traction forces, the compression forces and the cutting forces) were positioned at the balconies, at the junction between the supporting metal structure and the concrete slab. Indeed, this range of Schöck switches, made up of stainless steel elements passing through an insulating neopor body, interrupts the heat flow in the metal element: the supports, usually in one piece, are separated and the switch placed in place in the intermediate space ensures the resumption of structural forces and the continuity of thermal insulation.

An economical solution that is particularly easy to implement by simple screw connection, Schöck Isokorb® KST has the advantage of avoiding energy and heat losses while also limiting the risks linked to humidity and condensation, namely the appearance of mold. The “invisible” character of the breakers once installed (replacing the supporting posts) also seduces by the aesthetics it offers: perfectly thermally insulated facades which remain elegant! This visual reduction is also coupled with a reduction in overall operating costs.

In addition, around sixty Schöck Rutherma® Q breakers were used for concrete-concrete connections in certain areas of the building.

Technical characteristics of the renovated building

• Sources: Propassif Area: 2 244 m²
• Exterior wall: Concrete 2100 W / (mK) 180 mm - Wood fiber 0,040 W / (mK) 240 mm - Coating 0,325 W / (mK) 10 mm // U-value = 0,179 W / (m² K)
• Air tightness test: 0.34 vol / h
• Heating energy consumption (according to PHPP): 11 kWh / m² / year

Technical characteristics of the new building

• Sources: Propassif Area: 3 552 m²
• Exterior wall: Concrete 2100 W / (mK) 180 mm - Wood fiber 0,040 W / (mK) 240 mm // U-value = 0,18 W / (m² K)
• Air tightness test: 0.54 vol / h
• Heating energy consumption (according to PHPP): 13 kWh / m² / year

Residential block labeled by Propassif France in Thionville (57): 18 apartments in R + 4

Installation of Schöck Isokorb® KST switches (steel-steel junction)

Another benchmark approved by Propassif: the residential block of 18 dwellings in Thionville, designed by ASP Architecture, an agency recognized for its expertise in architecture with high environmental added value, with the contracting authority Batigère, a major player in social housing in the region Great East.

Again, in order to avoid heat loss, treat dew points and comply with the criteria of the passive label, the anchoring of the metal structure of the balconies on the concrete wall was effected by means of the Schöck Isokorb breakers. ® KST. These were fixed by metal shoes: simplicity and speed of implementation much appreciated on construction sites.

Let us conclude by highlighting the fact that for all these passive achievements, the building envelope must be homogeneous, continuous and without thermal bridges (inducing a separation of the projecting parts of buildings such as loggias, balconies and acrotères). Schöck combines performance of its solutions with excellence of its services. It therefore not only offers breakers with the approval of the Passivhaus Institute, but also supports projects from their design to their delivery to confidently guarantee their passive certification.