Waterproofing Membrane for Shower,Waterproof Membrane 3.3 FTx44 FT Roll (146SF)
I bought this in a roll of 98.5 feet and used about 54 feet of it. I am also including 4 inside corners for a shower and the rest of a trimmed piece of 21" x 15'8". This is the Kauwn brand. It worked well for me.