A Failed waterproofing membrane isn't the only moisture causing defect to a shower recess.
Penetrations to your wet area are an easy location for water ingress into your walls creating a haven for cockroaches, or if left undetected, Termites and wood rot. This unsuspecting home owner would never have expected until its too late. A failed washer to this tap was tracking internally in the wall completely invisible to the naked eye. This owner was in shock as he had only just renovated the ensuite 4 years prior due to a failed waterproofing membrane. Just a little insight into some of things our inspectors are trained to pick up on with a specific flood test to the shower recess .