There are a few things the factory does NOT do correctly on your type shower
1. The area BELOW the door, that metal cross on the shower pan. IS IT screwed to the shower pan? If not you need to drill 2 holes, inject DAP sealant, NOT SILICONE. and install 2 screws. These screws keep the complete enclosure from shifting in transit. IF you can grab the sides of the shower and shift it left and right, that means that the sealant UNDER the metal frame to the top of the shower pan is not sealed. The BLUE arrow areas do not need to be sealed.
2. Silicone (most OEMs use it) is NOT OK. Silicone will not adhere to the fiberglass shower walls, it will peel right off. We use DAP sealant adhesive from Lowes or HD and use the type that comes out white, but dries clear.
3. The CORRECT fix for you problem is to have the shower walls removed, all old silicone cleaned off and butyl installed where the shower walls sit on the shower pan and then reinstalled and THEN seal all edges bottom and sides with the DAP sealant. Doug
