About the BDA Watertightness Tester

A test specimen is laid on the metal flange (covered with a rubber strip) of the metal pressure box of the BDA Watertightness Tester. On top of the test specimen a metal frame (covered at the lower side with a rubber strip) is laid and firmly tightened to the flange with butterfly bolts. Subsequently the test specimen is loaded from below with compressed air at (usually) 15 kPa. The upper side of the test specimen is covered with a soap solution in order to be able to observe leakage (soap bubbles).
The apparatus is also suitable for testing leakage in (joints of) roof waterproofing sheets by means of air pressure according to the (expired) UEAtc M.O.A.T. No. 27:1983 – General Directive for the Assessment of Roof Waterproofing Systems, § 5.2.1 – Test for resistance to leakage of joints.


  • EN 12691:2006
  • EN 12730:2015
  • EN 13583:2012