Last updated: 12 May 2026
A glass shower door leaking in the corner — or a shower screen leaking at the bottom corner — is a proper nightmare, especially if you have a suspended timber floor or expensive LVT flooring that is prone to water damage.
It usually starts with a small puddle that looks like splashback. You wipe it up, replace the bottom seal, and for a day or two it seems sorted.
Then the same little stream appears again — right by the hinge corner.
It’s a common frustration: you’ve replaced the bottom seal with a brand-new one, yet water still escapes from the hinge corner or fixed panel joint.
Forget the confusing chatter on DIY forums. We’ve stripped away the fluff to give you a professional, straight-talking strategy to help secure that corner once and for all.
Why Does it Still Leak After Replacing the Seal?
“Why is my shower screen still leaking at the corner even though I’ve already got a bottom seal fitted?”
The culprit is usually the "interface"—the tiny physical gap where the glass meet the metal hinge or the wall profile.
A standard bottom shower door seal is designed to control water along the lower edge of the glass. If the leak is coming from the hinge corner, wall profile or fixed panel joint, the bottom seal may still be doing its job — but the corner may need an additional threshold seal to close the escape route.
If the seal itself is cracked, yellowed, brittle or no longer gripping the glass properly, start by replacing the seal before adding any extra threshold strip.
Many people go round in circles here. They try a deeper fin, a softer fin, a longer seal or a different profile altogether. But if the water is escaping around the hinge, along the tray edge or through a failed silicone joint, changing the bottom seal again will not fix the real route out.
Think of the bottom corner as a junction. The glass, hinge, tray, bottom seal and wall profile all meet in one small area. If there is a gap, water will find it.
This is especially common with frameless shower doors, where there is less metalwork to hide small gaps around the hinge side. That is why a frameless shower door can leak at the corner even when the main bottom seal looks perfectly fine.
Quick Diagnosis: Where Is the Corner Leak Coming From?
A wet patch at the bottom corner does not always mean the same thing. Whether you describe it as a shower door leaking in the corner, a shower screen leaking at the corner, or a shower enclosure leaking in the corner, the first job is to find the route the water is taking.
Before buying another seal, use this table to narrow down the cause.
| What you see at the corner | Most likely cause | Best next step |
|---|---|---|
| Water leaks from the bottom corner of the glass door or shower screen | The bottom seal is worn, too short, distorted or not reaching the corner | Replace the bottom seal with the correct size |
| You have fitted a new bottom seal, but the hinge-side corner still leaks | Water is escaping through the hinge gap or hinge-side interface | Add a threshold seal outside the bottom seal |
| It only leaks when the shower head points at the hinge corner | Water pressure is forcing water through the hinge gap or door edge | Redirect the shower head and add a threshold seal if needed |
| Water runs along the bath rim or shower tray edge and spills over at the corner | The corner needs a raised water barrier | Fit a threshold seal or water bar |
| Water seeps from the shower tray base, wall corner or outer joint | The silicone is poorly applied, aged, cracked or peeling | Remove the old silicone and re-seal with sanitary silicone |
| Water leaks along the full bottom edge of the door | The main bottom seal has failed or no longer grips the glass | Replace the main bottom seal first |
This quick check saves a lot of trial and error. Many corner leaks are not caused by the wrong bottom seal, but by the missing barrier at the hinge corner or tray edge.
The 3-Minute Corner Leak Test
Before ordering anything, do a quick test. You do not need tools or need to remove the door. You just need a dry corner, a little water and a few minutes.
Test 1: Dry the Corner First
Dry the bottom of the glass, hinge corner, underside of the bottom seal, tray or bath rim, wall corner and the floor outside the screen.
If the area is already damp, every part of the enclosure looks guilty, which is why a shower enclosure leaking in the corner can be so hard to diagnose. Dry it first, then watch where the first water appears.
Test 2: Check the Bottom Edge
Run a small amount of water along the lower edge of the glass. Do not aim at the hinge yet.
If water escapes across most of the bottom edge, the bottom seal is probably worn, distorted, loose or cut too short. Replace the main bottom seal first.
If most of the door stays dry but one corner leaks, check whether the seal ends too early or fails to cover the corner. This is often the case when a shower screen seal is leaking in the corner rather than along the full bottom edge.
Test 3: Check the Hinge Corner
Gently direct water towards the hinge-side corner. Do not blast it with the shower head; just recreate normal splash.
If the hinge corner leaks while the middle of the door stays dry, the water is probably escaping through the hinge-side gap. Another bottom seal often will not help here. A threshold seal outside the existing seal is usually the cleaner fix.
Test 4: Check the Tray or Bath Rim
Let a small amount of water run along the tray edge or bath rim.
If it tracks along the edge and spills out at the corner, you need a raised barrier there. A threshold seal or water bar is designed for this kind of leak, especially where the shower tray is leaking at the corner rather than under the full door edge.
Test 5: Check the Silicone Joint
Look at the tray base and wall corner. If water is slowly seeping from a joint rather than running from under the door, the issue is usually silicone.
Old silicone can crack, shrink, lift or pull away. In that case, remove the old silicone, clean and dry the area, then re-seal with sanitary-grade silicone.
A useful trick is to place small pieces of kitchen roll under the door, at the hinge corner, along the tray edge and at the wall base. The first piece to get wet usually reveals the leak path.
How to solve this type of corner leakage problem
To help stop a corner leak in its tracks, you often need a Threshold Seal — a small water bar that catches the water sneaking past the hinge or tray edge and redirects it back into the tray.
We recommend two specialist solutions depending on your enclosure shape.
RY3463 T-Shape Seal
Best for straight glass panels and bath screens. Its rigid spine offers a clean, structural finish.
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PV29 Adhesive Seal
Best for curved enclosures or complex gaps. It’s highly flexible and easy to manipulate.
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Why Another Bottom Seal Often Won’t Fix a Hinge-Corner Leak
A bottom seal and a threshold seal solve two different problems.
A bottom seal clips onto the lower edge of the glass door and controls water escaping under the door. A threshold seal sticks to the shower tray, bath rim or outer lower edge and catches water escaping from the corner, hinge side or tray edge.
As a rule of thumb: if water is coming out along the full bottom edge, sort the bottom seal first. If the door edge is mostly dry but the hinge corner leaks, look at the threshold.
Which Threshold Should You Choose?
For straight screens and bath panels, the RY3463 T-Shape can be a neat option when you need a taller, more structured water stop. Its rigid spine gives a clean finish that looks closer to part of the original enclosure.
For curved enclosures, awkward hinge areas and complex gaps, the PV29 Adhesive Seal is usually easier to fit. Its flexible, peel-and-stick design makes it more forgiving if the tray edge is not perfectly straight.
If you are comparing different threshold styles, including rigid 5mm strips, flexible 5mm seals and taller 13mm T-shape profiles, see our full guide on how to choose the right shower threshold strip
Quick Rule Before You Buy
If water leaks along the whole bottom edge, replace the bottom seal.
If water only appears at the hinge-side corner, add a threshold seal.
If water seeps from the tray base or wall corner, re-silicone the joint.
If your test points to a hinge-corner or tray-edge leak, this is the simple fix most people miss.
A £15 fix today saves a £500 floor repair tomorrow.
SHOP PROFESSIONAL-GRADE CORNER SEALSDispatched from our UK warehouse. Order by 2pm for same-day dispatch.
A Quick Temporary Fix (The Silicone Method)
If you need an immediate fix while waiting for your order:
Apply a small bead of sanitary-grade silicone to the inside of the gap.
Warning: This is only suitable for fixed panels. Do not use this on moving doors as it will prevent them from opening and is notoriously difficult to clean when you eventually replace the seal.
Silicone is tempting because it feels quick. Used in the right place, it can help. Used in the wrong place, it can turn a simple job into a messy one.
If the leak is coming from the tray base, wall corner or a fixed joint, a small bead of sanitary-grade silicone may be a useful short-term fix. If the leak is at the hinge-side corner of a moving door, a threshold seal is usually cleaner, neater and easier to maintain than trying to seal around moving hardware.
Expert Maintenance: Cutting the Mould Cycle
Mould thrives in the standing water found in leaky corners. By sealing the leak, you are already halfway to a cleaner bathroom. To extend the life of your new seals:
Keep it Dry: Wipe down the glass and threshold after use.
Avoid Harsh Chemicals: Bleach makes PVC brittle. Use mild, citric-based cleaners instead.
[Read our Full Maintenance Guide →]A small corner leak is not just annoying. It leaves water sitting around the hinge, seal and tray edge, which encourages mould and shortens the life of PVC seals.
Deal with small leaks early and you are far less likely to end up with swollen flooring, black mould or a much larger repair bill.
Verified UK Feedback
"The RY3463 sorted my leaking Aqualux bath screen in minutes. I’d tried three other seals before this—this is the only one that actually bridged the hinge gap." — James, Birmingham
"Brilliant little strip. PV29 followed the curve of my enclosure perfectly." — Sarah, Surrey
Need to replace the main seal first?
Browse our full range of replacement shower door bottom seals for different glass thicknesses, gap sizes and door types.
If you have a pivot door, our pivot shower door seal replacement guide explains how to choose the right bottom seal, side seal and corner details so you do not keep chasing the same leak.
Shower Bottom Seal Ultimate GuideFrequently Asked Questions
Why is it still leaking with a brand-new seal?
If a new bottom seal has not stopped the corner leak, the water is probably not escaping along the full lower edge of the glass. It may be getting out through the hinge-side gap, along the tray edge, or through a weak silicone joint.
I’ve tried two different bottom seals. Why is it still leaking?
If two different bottom seals have failed to solve it, the leak path is probably elsewhere. Most often, water is escaping at the hinge corner, travelling along the tray edge, or seeping through tired silicone.
Do the kitchen roll test before buying another seal.
Why does water leak from the hinge corner instead of the middle of the door?
The hinge corner is where several parts meet: glass, hinge, seal, tray and sometimes a wall profile. A tiny gap in that area can let water through, even when the middle of the door looks dry.
Where exactly should the threshold be fitted?
Fit the threshold seal outside the existing bottom seal, on the tray or bath rim where the water is escaping.
The end should sit tight against the wall or vertical profile. Where possible, the bottom seal fin should overlap the threshold by around 3–5mm.
Can I use silicone to stop a shower door corner leak?
Silicone is suitable for fixed joints, tray base gaps and wall corners. It is not a good solution for sealing a moving door or hinge area.
If the leak is at the hinge-side corner, a threshold seal is usually neater and easier to maintain.
Is water leaking from the shower tray bottom a seal problem?
Usually not. Water seeping from the tray base, wall corner or outer joint normally points to failed silicone, not a failed shower door seal.
Remove the old silicone, clean and dry the area properly, then apply sanitary-grade silicone.
Can a leaking shower door corner damage my floor?
Yes. Repeated water exposure can damage suspended timber floors, LVT, laminate, skirting and timber edging.
A small corner leak can quickly turn into swelling, mould or a much more expensive repair.