Fix a Sliding Shower Door That Leaks at the Bottom
Quick answer
A sliding shower door leaks at the bottom through four paths: weep holes in the track clogged with soap scum, a crumbled vinyl insert in a framed panel's bottom rail, spray escaping the vertical overlap between the panels, or water running out the open track ends. Run the shower for five minutes and watch from outside; where the drip appears names the path. Whatever you find, never caulk the track's inside edge or its weep holes.
Data reviewed:
Likely causes and how to recognize them
| Cause | How to recognize it |
|---|---|
| Clogged or caulked weep holes | The track holds standing water and keeps dripping over the outside lip for minutes after the shower is off. |
| Crumbled bottom-rail seal on a framed panel | The vinyl blade in the panel's bottom metal rail is brittle, cracked, or missing in stretches, and drips show up directly under the moving panel mid-shower. |
| Spray driving through the panel overlap | The floor gets wet only when the showerhead points at the seam where the two panels overlap, and a wet stripe runs down the inside face of the outer panel. |
| Open or failed track ends | The puddle sits at one wall corner where the track meets the jamb, and the caulk there is cracked or an end cap is missing. |
Step-by-step fix
- Run the five-minute test. Aim the shower at the closed door for five minutes and watch from outside with a flashlight. A drip over the track lip means weep holes, a drip under the moving panel means the rail seal, a wet seam means the overlap, and a corner puddle means the track ends.
- Clear the weep holes. Probe each hole on the track's inside face with a zip tie until trapped water drains back toward the tub. If a previous owner caulked them shut, cut every bit of it out. While the track is empty, scrub out the soap scum with white vinegar and a nylon brush; a scummed-up track that never drains will always find the outside lip.
- Renew the panel's bottom seal. Framed panels: lift the moving panel out first. Raise it straight up so the rollers clear the top track, swing the bottom out of the plastic guide, and lay it on cardboard; never rest a bare tempered edge on hard tile, and use two people on anything bigger than a standard tub panel. Slide the old vinyl blade out of the slot in the bottom rail, match the new insert to the slot profile rather than the glass (the framed shower door sweep page covers the common profiles), cut it 1/16″ short with miter shears, slide it in dry, and rehang the panel. Frameless panels: measure the glass edge first, since sliders come in 5/16″, 3/8″, and 1/2″ and a press-on sweep sized wrong will not grip. Most are 3/8″ (9.5mm), and the glass thickness measuring guide shows how to check. Press the matching short-wipe sweep onto the bottom edge and notch it around the bottom guide.
- Re-aim the overlap. Keep the panel nearest the showerhead on the inside track so spray presses the seam closed, and angle the head away from the overlap. Closed panels should overlap by about an inch; if they barely meet, the rollers are out of adjustment.
- Re-seal the track ends, outside only. Cut out cracked caulk where the track meets each wall jamb and re-bead the outside face, along with the outside track-to-tub joint. Leave the inside edge of the track completely open so it can drain.
What to measure before buying
- Glass thickness at the bare edge — pull back a section of the old seal first (1/4″, 5/16″, 3/8″, or 1/2″)
- Bottom gap from glass edge to threshold at the HINGE end, door closed
- Bottom gap at the HANDLE end, door closed — note any difference
- Door width along the bottom edge (for trimming the new seal)
- Where the water actually exits: under the door, off a bottom corner, or down a vertical edge
- Photo of the old seal's cross-section before removing it
Seal types that fix this
Matching replacement seals
Shower Splash Guard Corner Fins, 10 in, Pair
- Glass
- —
- Length
- 10″
- Material
- Clear PVC
- Mount
- adhesive
Quarter-round fins that mount at the curb corners to block low-angle spray escaping around the fixed panel or door edge. Sold in pairs with adhesive or silicone.
⚠ Fixes corner splash only — water passing under the door needs a sweep, not a splash guard.
Frameless Shower Door Bottom Sweep with Drip Rail, 1/4 in Glass, 1/2 in Wipe, 36 in
- Glass
- 1/4″
- Gap
- 1/8–3/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 1/4 in Glass, 3/4 in Wipe, 36 in
- Glass
- 1/4″
- Gap
- 3/8–5/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 3/4 in wipe seals gaps of 3/8 in–5/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 5/16–3/8 in Glass, 1/2 in Wipe, 36 in
- Glass
- 5/16–3/8″
- Gap
- 1/8–3/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Dual-size channel seats snug on 5/16 in and neutral on 3/8 in glass. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
⚠ On 5/16 in glass press the channel on dry; lubricant makes dual-size channels creep.
Frameless Shower Door Bottom Sweep with Drip Rail, 5/16–3/8 in Glass, 3/4 in Wipe, 36 in
- Glass
- 5/16–3/8″
- Gap
- 3/8–5/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Dual-size channel seats snug on 5/16 in and neutral on 3/8 in glass. The 3/4 in wipe seals gaps of 3/8 in–5/8 in. Cut with a fine-tooth hacksaw.
⚠ On 5/16 in glass press the channel on dry; lubricant makes dual-size channels creep.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 1/2 in Wipe, 32 in
- Glass
- 3/8″
- Gap
- 1/8–3/8″
- Length
- 32″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
Common buying mistakes
- Caulking the weep holes or the inside edge of the track; trapped water rises until it finds the outside lip, turning a slow after-drip into a steady leak.
- Fitting a tall hinged-door wipe to a sliding panel: it drags in the track, binds the rollers, and shreds in weeks. Sliders take short wipes or slide-in rail inserts.
- Replacing seals when the bead under the track has failed; water at a wall corner can be seeping beneath the track itself, so check the outside track-to-tub joint before buying parts.
Frequently asked questions
Should I caulk the bottom track of a sliding shower door?
Only on the outside face, where the track meets the tub or curb and at the wall ends. The inside edge stays open so water can drain back into the tub, and the weep holes must never be sealed.
Why does my sliding door keep dripping after the shower is off?
That is the track emptying through clogged weep holes; standing water slowly wicks over the outside lip. Clear the holes with a zip tie and the after-drip stops.
Which panel goes on the inside track of a bypass door?
The panel nearest the showerhead belongs on the inside track. Spray then presses the overlap closed instead of driving through it, and water running down the inner panel drips into the tub.
My door swings on hinges, not a track. Do these fixes apply?
No. Hinged doors leak at the bottom through the sweep and drip rail, not through a track, so the diagnosis is different; see our guide to fixing a hinged shower door that leaks at the bottom.