BUNDESVERBAND LEICHTBETON

Solid walls made of lightweight aggregate concrete inhibit burglary

Burglary of their own four walls is a huge shock for many people. That it is possible to take precautions against those risks is revealed by criminal statistics: One third of all burglaries remain an attempt, not least because of technical security facilities. These facilities include the installation of burglary-resistant building elements, such as windows and doors, and their installation has been supported by the German Federal Ministry of the Interior and the KfW bank since 2015.

The DIN EN 1627 to 1630 series of standards provides an approved set of rules that has been well-proven in practice for the specification of the requirements, the test methods and the classification of burglary-resistant building elements. As part of a holistic approach, requirements are also imposed on the installation and the characteristics of the fastening substrate. This should ensure that the burglary-resistant building element can achieve the performance properties proven on the test bench in practical application as well.

For this reason, ift Rosenheim testing laboratory conducted tests regarding the burglary resistance of a cast solid wall made of lightweight aggregate concrete (LAC) with open structure according to DIN EN 1520, achieving excellent thermal insulation. Such exterior walls are made in lower density classes as well as lower strength classes in order to meet even the highest demands made by the German Energy Savings Regulation on the reduction of the transmission heat loss of the building envelop.

Certified safety for the owner

The test specimen was investigated regarding the resistance to static and dynamic loads in compliance with DIN EN 1628 and DIN EN 1629, respectively, using the structural element according to the normative specification. The tests regarding the resistance to a manual burglary attempt in compliance with DIN EN 1630 was extended. The procedure was carried out „from inside to outside“. This means that first a regular burglary resistance test was carried out on the building element within the classified resistance class. The objective was to investigate whether the installation in the wall element has an influence on the resistance class of the window itself compared to an installation in a rigid test frame. Then, the construction joint, the fasteners and the anchoring of the fastener in the wall element were tested in the wall element. An attack to the wall surface for cutting an opening for entering was also carried out as part of the investigations. The toolkit respectively stipulated for this additional attack that is normatively not required was used.

The investigations conducted reveal that usual 425 mm thick solid walls made of lightweight aggregate concrete of strength class 2 and the density class 0.60, being applied with a lightweight plaster of type CS II, are suitable for the installation of burglary-resistant building elements, being installed in the middle third of the window reveal, featuring resistance class RC 2 as recommended by the police. The fastening substrate – in interaction with the chosen installation version – had no negative impact on the classified burglary-resistant properties of RC 2 windows.

Levering out the entire window by digging out or destroying the fasteners or by cutting an opening for entering when attacking the actual wall surface was neither possible by using the toolkit stipulated for RC 2 nor by using the toolkit stipulated for RC3.

Text: Dr.-Ing. Thomas Kranzler

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Bundesverband Leichtbeton e. V.
Sandkauler Weg 1
56564 Neuwied/Germany
+49 2631 355550

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