Your shower door isn't the problem.

A frameless shower door is a sheet of tempered glass hung on quality finished hinges and clamps. There is nothing in it to fail. When water shows up on the floor, people assume the glass is the problem and start shopping for a new door. Almost every time, the leak is coming from one of three places that have nothing to do with the glass.

1. The sweep

Ninety percent of shower leaks are the sweep: the clear vinyl strip along the bottom edge of the door. Sweeps go stiff, they crack, they yellow, and eventually they stop touching the curb. Water runs straight under the door.

It is an inexpensive part. The old one slides off the bottom edge, the new one slides on. Bring the old sweep with you to the store so you match the profile, because there are several and they are not interchangeable.

2. The silicone at the wall

Look at the joint where the fixed panel meets the tile. When that bead goes gray or starts pulling away from the wall, water gets behind it and comes out at the floor, sometimes a foot away from where it went in.

Cut the old bead out cleanly with a blade, dry the joint, and run a fresh bead of 100% silicone. Then do not use the shower for 24 hours. The cure time is the step everybody skips, and a bead that gets wet before it cures will fail again within weeks.

3. The curb

This one is not your glass at all. It is your tile. Lay a level across the top of the curb. If it does not slope back into the shower, water is going to run out onto the floor no matter what door you hang on it. That is a tile problem, and no glass company can fix it with glass.

While you are in there: if your shower head is aimed straight at the door, turn it toward the wall. Frameless doors are designed to let a little water past the edges. That is how the style works. It is not a defect.

Try the sweep first

Really. Sweep, silicone, curb, in that order. If all three check out and the floor is still wet, then it is time to call, and the visit is free.