I am planning to replace my coping and water tile in the near future. I have read much on this site and the internet in general. It seems there are differing opinions about the need to water proof behind the water tile with a product such as Laticrete Hydro Ban. Are there certain situations that dictate water proofing? Any thoughts and suggestions on whether this is necessary or overkill are appreciated.
Also, I will need to build up about a 1 1/2" substrate between the bond beam and coping. I have read posts that suggest to do so in two steps 1) add a bed of type s mortar and 2) once type s is cured, add a thin layer of thin set to set the coping. My coping appears to have been laid directly in a thick layer of mortar. Nearly all pieces of coping are loose and the ones I have tested pull up with very little effort without disturbing the mortar bed. The mortar bed bonded with the bond beam extremely well, but not with the coping. So, should I remove the existing mortar bed, just to replace it? Or should I just use the old mortar as my base and set the new coping on that existing mortar bed with thin set?
Thanks in advance for your help.