FAQ Schöck Isokorb®


What is Schöck Isokorb®?

Schöck Isokorb® is a load-bearing thermal insulation element which minimizes thermal bridges in the building envelope between the interior and exterior structures. At the same time, this thermal break element transfers loads from the exterior to the interior structural elements.

Which types of buildings is Schöck Isokorb® used in?

Schöck Isokorb® can generally be used in all heated buildings with structural elements projecting from the building envelope. Typically the application is used in buildings made of steel or reinforced concrete. Common building types are high-rise residential as well as institutional buildings such as schools, dormitories, museums, gymnasiums, etc. Browse our project references for further information.

Which applications can be connected with Schöck Isokorb®?

The standard Schöck Isokorb® products can be used to connect the typical projecting components, such as cantilevered balconies, supported balconies, loggias, slab edges, and canopies. In addition, they can be used for customized solutions for nearly all applications and load situations in high-rise construction (e.g. foundations, attics, and more). Our Schöck specialists would be happy to assist you.

Planning and Design:

Can Schöck Isokorb® transfer earthquake loads?

The standard product range includes special modules for the absorption of earthquake loads. It is used in addition to linear connection (e.g. Type CM, type CV, type CMD) and can easily be incorporated into planning and standard designs.

Does Schöck Isokorb® provide any fire resistance?

If compliance with project specific fire safety requirements is requested, Schöck Isokorb® can be supplied with fire resistance up to 120 minutes.

Which free cantilever lengths can be achieved with Schöck Isokorb®?

Generally Schöck Isokorb does not compromise the structural performance of traditional connected structures. Balconies with standard live loads can be connected easily with a free cantilever length of up to 9.8424 ft (3 meters) with the standard products. Secondary components, such as canopies, can also be connected with significantly higher cantilever lengths. Our Schöck specialists would be happy to assist you.

Which documents do the Schöck experts need to develop a technical solution?

  • Dimensioned floor plans and cross-sections of the component to be thermally separated
  • For reinforced concrete components: concrete quality, concrete cover, load assumptions
  • For steel structures: design loads at the connection (ULS factored)

On which basis are the structural design values of Schöck Isokorb established?

Construction with Schöck Isokorb® C-line has been evaluated in accordance with the ACI 318-11 Building Code Requirements for Structural Concrete.
The design capacities of the Schöck Isokorb® type S22 have been independently checked and approved as compliant with ANSI/AISC 360-05 Specification for Structural Steel Buildings.

Does Schöck offer an ICC-ES report for Isokorb type S22?

For Schöck Isokorb type S22 there is no ICC report available. The structural performance of the product is calculated according the current US codes for designing structural steel buildings.
Structural design calculations, provided by an independent PE, indicate that the design strength of Schöck Isokorb type S22 meets or exceeds all applicable limit states per ANSI/AISC 360-05.

Does the connection between the stainless steel and the reinforcement steel has a durable load-bearing capacity?

Due to thermal insulation and corrosion protection requirements, stainless steel is used around the gap. The stainless steel bar is extended by butt-welded reinforced steel at both sides until the required length is achieved.

This design is approved by several material test establishments and has been tried and tested for over 25 years. The flash butt welding method is used for the butt-welded connection between stainless steel and reinforcement steel. The requirements for quality assurance of this connection are very high and are met by internal quality control as well as third-party inspections.

Does there exist any risk of contact corrosion due to the butt-welded connection of stainless steel and reinforced steel?

As both bars are embedded in the concrete several tests have shown that there is a negligable risk of contact corrosion due to reduced oxygen in the concrete.

How is Schöck Isokorb® shipped and packaged?

The Schöck Isokorb® products are delivered to the construction site as ready-to-install products. They are shipped on wooden pallets. The products are held together by wrapping foil and protected by special packaging material. Please refer to the installation manuals for detailed instructions.


Which methods and tools can be applied to divide the Schöck Isokorb® products at the construction site?

Schöck Isokorb® is designed and shipped to the construction site in a standard length of 1 meter (3.28 ft). In order to achieve connection lengths outside of the 3.28 ft (1 meter) raster, the product can be divided in the middle. A simple hand saw can be used to accomplish this. Please see the installation manuals for detailed illustrations. Please refer to the installation manuals for detailed instructions.

Do you offer Isokorb installation support services?

Yes, Schock provides on-site guidance, including installation advice by Schock specialists, instruction for professional use and installation of Isokorb including the installation guide with illustrations. In addition, Schock can provide advice on the alignment of modules and types at the job site. Speak with your Sales Manager for further information on these services.


Schöck USA Inc.
281 Witherspoon Street
Suite 110
Princeton, NJ 08540
Tel.: 855 572 4625 /
        855 5 Schöck
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