Schöck Isokorb® is a load-bearing thermal insulation element. It works in two ways:

1. Thermal insulation

For optimum thermal insulation in the Isokorb®, a highly effective HCFC-free insulation layer made from polystyrene hard foam is used along with stainless steel and UHPC (ultra high performance concrete) compression elements. The Schöck Isokorb® offers a safe and easy solution to achieve better R-values and a lot of other benefits.

2. Structural action

Load transfer moment

Load transfer in cantilevered balconies requires Schöck Isokorb® to transfer moment and transverse forces into the connecting ceiling. Transfer of the bending moment is ensured by the tension rod (top) and the pressure bearing (bottom). A bending moment may be divided into a force couple, which has the same value but points in different directions. The moment is calculated from force F multiplied with the inner arm of lever e.

M = F x e

This is how the moment from the balcony slab is divided and transferred into the ceiling panel by tension in the upper tension rod and pressure in the pressure bearing. The higher Schöck Isokorb® is, the higher the inner lever arm, the higher the bending moment that can be transferred. The maximum (actually minimum) possible moment that can be transferred is called mRd.

Load transfer transverse force

The transverse force (vertical force from the balcony slab) is guided from the concrete into the bent edge of the tension rod. There it is divided into a tension component in the shear force rod and a pressure component in the HTE pressure module by resolution of a force (triangle of forces). On the ceiling side, the tensile force from the shear force rod is redirected in the bend and guided into the ceiling via the tension rod and the concrete. In order to ensure that the shear force rod is tensioned, Schöck Isokorb® must be installed in a manner that allows the shear force rod to run from the bottom outside to the top inside.  The maximum possible transverse force that can be transferred is called VRd .


Schoeck Canada Inc.
55 King Street West
Suite 700
Kitchener, Ontario, N2G 4W1
Tel: +1 855-572-4625
Subscribe to Schöck newsletter