I have my shower room down to the studs. It has an old terrazzo shower pan which I hope to reuse. It had an inch high metal (lead?) edging around it. It was fairly decayed so most of it has broken off or been removed.
I have Wonderboard lite and Redguard ready to go up, but I'm not sure if I need something to further waterproof the section between the shower pan and the backerboard? I had a drywall guy in and he mentions that there is usually a rubber strip on new shower pans that prevents water ingress.
Is there something I should do before putting on the wonderboard / tile?