About the BDA Watertightness Tester

Test specimens of the sheet are subjected to a waterhead and the volume of penetrating water is measured. A conditioned test specimen is positioned as a water-carrying layer into a device with flange and defined basic surface. Water occasionally penetrating the test specimen will be collected in a basin positioned under the testing apparatus and volumetrically measured at the end of the test. 

References

EN 13111:2010