When building a balcony – your very own outdoor space – a large number of forces need to be brought into static equilibrium. Construction is also affected by strict legal requirements with regard to thermally insulated and airtight façades. With its ISOPRO elements, H-Bau Technik GmbH has been providing tried-and-tested solutions to the challenges associated with thermal energy for many years. They statically connect constructions made of concrete reliably to the façade, thereby simultaneously preventing thermal bridges. The integrated tension and shear rods together with the compression bearings reliably bear the moment and shearing forces. The load-bearing capacity of the compression bearings in the ISOPRO elements for connecting external to internal concrete components has now been increased. By using a high-strength stainless steel, the construction supplier from Klettgau in southern Baden has also been able to reduce the diameter of the tension rod in the insulating joint by around 36 per cent. These innovations will reduce heat transfer while retaining the same static load-bearing capacity. A strip of tension rods now provides additional stabilisation for the insulating body and makes installation easier.
Due to the high conductivity of concrete and the large surface area of the connected external components compared to the cross-section of the connection, if the connections are not sufficiently insulated or not insulated at all, the heat flow rate will be extremely high. This leads to high energy requirements and the formation of condensation on cold internal surfaces, which is accompanied by the growth of mould. Using the ISOPRO thermal insulation elements from H-Bau Technik reliably eliminates these weak points. With reliable transfer of static loads at the same time, the minimum requirements for thermal insulation in accordance with EnEV and DIN 4108-2 supplement 2 are far exceeded.
The load-bearing capacity of the compression bearings for concrete-concrete connections has now been significantly increased. The ISOPRO elements with concrete compression bearings are now achieving much higher load-bearing capacities. This has numerous benefits. Some elements do not have the steel compression bearings and will be replaced by the more compact version made of special concrete. This is lighter, transfers less heat and does not project beyond the insulating body, meaning it can be installed more easily. Due to its higher capacity, the number of concrete bearings used can also be reduced. This additionally increases the insulating effectiveness of the ISOPRO elements. The diameter of the tension rods in the insulating joint area has also been decreased. The stainless steel used in these now generally has a smaller diameter than the welded structural steel rods. Using the high-strength stainless steel 1.4482 here ensures that the load-bearing capacity remains the same while heat loss is considerably reduced once again by minimising the cross-section.
The tension rods are fixed in place using the new "Easy-fix" system. This not only secures the iron reinforcement in its axial position, but also guarantees that the concrete covering is reliably achieved. Furthermore, the stability of the insulating body is increased even further. When using two-part elements in the prefabricated parts factory in particular, positioning and fixing is no problem at all. The more advanced ISOPRO connections have already been granted the technical approval Z-15.7-244 by the DIBt (German Institute for Structural Engineering). The attachment reinforcement previously required is also rendered unnecessary by the advancements made to the product, which brings numerous benefits in terms of ease of installation.
Image 1: Find the right connection: ISOPRO insulating elements thermally separate cantilever slabs from the thermal insulation level of the building.