We remodeled our home. It included a 5×5 walk in shower. The shower entrance is open…no door and at floor level. The floor then slopes to the drain all the way around so it is a recessed floor. A shower pan was installed but it did not go up the wall behind the durock…we think it was cut at the wall. Well, all the grout on the floor has come up and tiles are cracking and coming up off the floor. We have had two opinions regarding a shower pan installation. One says a shower pan is needed and it should be installed behind the durock but of course then the pan would be cut at the entrance as there is no step over. Another says there is no need for a shower pan as it is a recessed floor.
It should have a pan under the tile of some sort. The pan is about 2to3″ below floor and ends turned up and concrete poured in it and tile on that. We use to put in lead pans and turn them up 6″ in wall. In the entrance way it should be out beyon the openning and turned up.
It sounds like you need to remove the floor of the shower and the tile from the walls up to at least 6″-8″ and clear everything down to the wall and floor framing (or the concrete slab, if that’s what the floor is). Then you need to install an impermeable membrane or prefab shower pan over a solidly formed subbase (usually mortar). The impermeable membrane must extend at least 2″-9″ above the perimeter of the pan behind the walls of the shower (the higher the better). If you are building your own pan, you must use a special shower drain with built-in weep holes. Once this is in place, you place your tile and grount and caulk as usual.