I am confused about shower pan waterproofing. I have been told that the only IAPMO approved (I am told that there is no
UL or similar listing for this) shower pan liners are the ones made from PVC and similar materials. Yet, I constantly see
residential shower pans that have been hot mopped or torched down w/ modified bit. Furthermore, I also see alot of
products that are advertised as waterproof membranes for shower pans such as elastomeric coatings from several
manufacturers and also a product called Trowel & Seal (Custom Building Products). I am in the process of waterproofing a
couple of shower pans and do not want to go to the efforts of a full thickset mortar bed which would limit my choices to the
elastomeric coatings. What are people’s opinions about any of these products or methods.?