Fix a Shower Door Gap That Is Too Big
Quick answer
When the gap under a shower door passes 1/2 inch, first find out why: measure at the hinge end and the handle end. Uneven readings mean the door has sagged and hinge adjustment will shrink the gap for free. An even oversized gap means short glass or a low curb — fixed with an extra-tall 1 inch wipe or by raising the sill with a surface-mounted threshold and running a standard sweep.
Data reviewed:
Likely causes and how to recognize them
| Cause | How to recognize it |
|---|---|
| Hinge sag | Gap is wider at the handle end; the door may also rub the wall or panel at the top corner. |
| Glass cut short | Gap is even end to end and has "always been like this" since installation. |
| Curb built low or re-tiled | A bathroom remodel lowered the finished floor or curb relative to the door. |
| Sweep removed and never replaced | Previous owner pulled a dragging sweep; bare glass now hovers over the curb. |
Step-by-step fix
- Measure both ends, door closed. Difference over 1/8 inch = sag. Even reading = geometry.
- Fix sag first. Loosen the hinge glass-plate screws slightly, lift the handle end to level, retighten. Most frameless hinges allow 1/8–1/4 inch of correction.
- Re-measure, then size the wipe. Gap up to 1/2″: 3/4″ wipe. 1/2–3/4″: 1″ extra-tall wipe. Around 1″: threshold + standard wipe beats any sweep alone.
- Install and splash-test. Trim to width, install, run the shower and check both bottom corners with a paper towel on the bathroom floor.
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
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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.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 1/2 in Wipe, 36 in
- Glass
- 3/8″
- 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.
Common buying mistakes
- Buying the tallest wipe available for a sagging door — it drags at the hinge end while still gapping at the handle end.
- Shimming the door up with washers at the hinges instead of using the hinge's own adjustment.
- Filling the gap with a strip of caulk-on rubber that glues the door shut at the corners.
Frequently asked questions
How big should the gap under a shower door be?
Installers typically leave 3/16 to 1/2 inch for clearance and ventilation, then seal it with a sweep. Gaps beyond 1/2 inch exceed most standard wipes and need tall wipes, adjustment, or a threshold.
Can hinges really be adjusted to close the gap?
Yes — most frameless pivot hinges clamp the glass between plates and allow the door to be repositioned about 1/8–1/4 inch. Loosen, lift the handle end, retighten. Two people make it a five-minute job.
What if the glass was simply cut too short?
You cannot stretch glass, so close the difference from below: an extra-tall wipe for up to about 3/4 inch, or a surface-mounted threshold that raises the sill for anything larger.