how can I still be confused with waterproof debate
I started my tub surround project intent to put in new shower surround with the existing cast iron tub. I 4 mil polyed all 3 sides to the stud. I then faced delima on whether to put greenboard to just above tub lip or behind tub and to the floor.I had concerns to where water would go.Buddy helping so buddy win argument and behind it went. Now a gift of free tile was given to me so i switched things and am now going tile . I know putting up another vapor barrier can cause a vapor lock but should I be concerned about water getting behind tiles,backerboard and greenboard then beading down the poly and resting on my subfloor.the green board is siliconed to the tub and I'm ready for durock to be installed . Should anything be between those 2 boards. Should I tar paper over green board first if so should it be #15 pound Building Paper instead of tar paper.Should I RedGard over durock instead so water can come back in to tub area? My Brain itches. So many things to consider.