Safety

Autoclaved aerated concrete as an obstacle for burglars

Fig. 1 Detailed view.

Fig. 2 Schematic presentation of an Amo^®-Y screw and the window profile.

Fig. 3 Static pressure load of the locking points and crack formation at the wall corner.

Fig. 4 Dynamic test with a sandbag (30 kgs).

Fig. 5 Crowbar used for the WK 2 test.

Fig. 6 Test of a manual break-in attempt.

Fig. 7 Experiment to break directly through the wall with the aid of a crowbar within 5 minutes.

Fig. 8 Certified window element and the autoclaved aerated concrete wall after testing various points of attack for more than 30 minutes.

 A test series carried out some years ago already revealed that walls made of autoclaved aerated concrete may even provide a higher protection against burglary. In 2005, for example, ift (German Institute for Window Technique) in Rosenheim carried out tests with burglar-resistant windows, installed in autoclaved aerated concrete, of the resistance class WK 2 and presented a positive assessment.

In this regard, the German standard DIN V ENV 1627:
1999-04 „windows, doors, shutters - burglar resistance - requirements and classifications“ including the national notes are the basis for the verification of burglar-resistant properties. For such „burglary tests“ the windows are usually installed in a rigid steel frame. This frame is to substitute various kinds of wall constructions. The walls are classified in respect of their burglar-resistant properties according to the below-mentioned table. Therefore, only pressure-resistant bases qualify for burglar-resistant building components.

Autocl...