DIN 18534 Part 1:2017 Recommendations in Respect of Sealing Showers
DIN 18534: deals with waterproofing for indoor applications
DIN 18534 Part 1: Details requirements and principles for design and execution
DIN 18534 Part 1.8: Addresses planning and construction principals.
DIN 18534 Part 1.8.5: Deals with design detail.
DIN 18534 Part 1.8.5.2: Specifically addresses the sealing of areas under/behind baths or shower trays.
Areas under / behind bath or shower trays must be protected against water.
The sealing of these areas is to be carried out as follows:
Connect the bath rim to the sealing layer, for example with though sealing strips or frames
or
Continuation of the sealing layer under and behind the trough, possibly with underfloor drainage.
Sealing joints on the tub rim are not a seal within the meaning of this standard.