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.
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