Frameless shower enclosures do not seal as well as standard framed shower enclosures because of their very nature (frameless). With proper design and installation, frameless showers should not have problems with water leakage, but they are not 100 percent watertight. There are many ways to prevent water leakage around a frameless shower door. Here is what we recommend:
1. Proper slope on threshold of shower: The curb could be considered the most important part of the shower. It is the top of the curb, sometimes referred to as the threshold that is of most importance. The top of the curb should have a 5° positive slope inward towards the shower drain (Figure A). Much more and it becomes difficult for the shower door to open because the angle crushes the seal. Anything less than a 5° slope toward the drain, and it is prone to leakage because water will follow gravity. Our best recommendation is to use a single solid piece of granite, marble or stone instead of tile for the top of the curb. It is easier to get the proper slope towards the shower drain and eliminates the tile grout lines. Since the bottom seal of a frameless shower door rides on top of the curb and cannot follow into the grout lines, a solid threshold provides a better enclosure seal so water cannot leak out through the grout lines. Showers built for frameless enclosures require specific detail during their construction. Since frameless shower enclosures have no frame, the top of the curb must be sloped 5 degrees inward toward the shower drain to prevent leakage from any water that sheds off the door while taking a shower.
2. Position body sprays and faucet heads towards tile walls, not towards enclosure doors.
3. Install a shower sweep with drip rail onto the bottom of your frameless glass shower door. This will tighten up the clearance space under the door and prevent water seepage.