Is your glass shower door leaking at the bottom every time you take a shower?
Tired of stuffing towels into gaps or constantly mopping up puddles?
Water under shower door isn’t just annoying. It can lead to:
- Slippery floors
- Water damage
- Mold growth
According to the EPA, over 30% of respiratory problems are linked to damp indoor environments.
But don't worry — most shower door leaks at the bottom are a piece of cake to fix.
No need to call in a professional or replace your shower — sometimes, all you need is a simple, transparent plastic strip at bottom!
In this guide, we’ll show you:
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- Why shower doors leak at the bottom
- how to seal a frameless shower door or screen at the bottom
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how to seal shower door leaking at bottom corner
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how to seal sliding shower door leaks at bottom
Let’s dive in 👇
Why Frameless/Sliding Shower Doors Or Screen Leak at Bottom: 5 Common Causes
Before you fix it, you need to know what’s causing it.
If your issue isn’t listed, feel free to tell us in the comments!
Here are the most common reasons:
1. A gap at the bottom of the door
Shower doors are designed with a small clearance gap to allow smooth opening and closing. But over time:
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Hinges may loosen
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Doors can start to sag
This creates a larger gap, especially at the bottom corner — and that’s where water escapes.
2. Worn or Cracked Seals
Shower seals don’t last forever. They can harden, crack, or come loose with age.
If your door didn’t leak before but now it does, the seal is probably the culprit.
Seals need to be replaced every few years to stay effective.
3. Seal Installed Backwards
Yes, it happens. A seal that’s the right product but installed upside-down or facing the wrong way won’t work.
To avoid this common mistake, you can check out our detailed guide on which way should you install a shower seal— it clearly explains the correct orientation for installing your seal.
That’s why all SIMBA seals come with:
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Direction labels
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Clear installation guides
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How-to video tutorials
4. Uneven floor or bad slope
If your shower tray or bathroom floor isn’t sloped properly, water may run outwards instead of towards the drain.
Older homes – like Victorian or Edwardian properties – often have slightly uneven floors.
Or the drain might just be a bit slow, especially if it’s partially blocked.
5. No threshold seal (or seal deliberately left out)
In some installations, especially with frameless or walk-in shower screens, the bottom threshold seal is left out — either for aesthetic reasons or under the assumption that a sloped bathroom curb will prevent leaks.
Some installers even tell homeowners that the floor’s incline will naturally drain water away.
But here’s the truth: when water hits the glass at pressure — especially from handheld or wall-mounted shower heads — it often escapes past the bottom edge, even with a slight slope.
Without a threshold seal, water can easily seep out and spread across the floor, causing puddles and long-term damage.
A minimal, all-glass look might seem appealing, but skipping essential seals often leads to frustration down the line.
Modern shower threshold seals are designed to be discreet — so you don’t have to sacrifice style for a dry bathroom.
If none of the above seems to fit, take a photo of the problem and email it to us:
📧 info@showerdoorseal.uk
We’ll help figure out what’s going on – and recommend a proper fix.
We might even add your case to this article to help others too.
And don’t worry – it’s totally free to ask. We're here to help.
How To Seal Shower Door Bottom
Worried about leaks at the bottom of your shower door?
Whether it’s a frameless shower door, a sliding door, or even a shower screen, the solution is pretty much the same. Don’t stress — sealing the bottom of your shower is easier than you think.
Here’s the deal: we’ll show you how to fix the leak with two simple, effective steps.
A. Seal the Bottom of Your Frameless Shower Door (and Screen)
While re-adjusting the door or tray may help, combining a bottom door seal for shower door with a threshold is usually the simplest fix.
If you're wondering what that plastic piece at the bottom really does, check out our guide: What’s the plastic at the bottom of the shower door? It’s more important than you think.
This combo is the best way to seal the bottom of a frameless shower door.
Step 1: Install a Shower Door Seal
Start by installing a PVC shower door seal on your shower door.
This simple step helps block water from leaking out at the base.
No need for silicone sealant — just make sure your bottom shower door seal is properly fitted and sized to your glass thickness.
If you're wondering which way the shower screen seal should go, or how to match the right seal to your glass thickness (4mm, 6mm, 8mm, 10mm),
check out our guide: The Complete Guide Shower Door Seals
All SIMBA seals come with:
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Marked fitting direction
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Step-by-step video tutorials
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Live support if you get stuck
Remember: Choosing the right bottom seal is the first (and most important) step to a leak-free, stress-free shower.
Step 2: Add a Shower Tray Threshold Seal
Now add a clear shower threshold seal to the base of your shower opening.
This creates a small barrier on the shower tray — right below the door.
Double Protection: Why Use Both?
For the best results, use both a shower door seal and a threshold ramp together.
By combining:
- a bottom seal for your shower door
- and a threshold strip on your tray
you create double protection against leaks. This method works especially well for frameless glass showers, where water tends to find every little gap.
B. How to seal sliding shower door leaks at bottom
C. How to seal shower door leaking at bottom corner
FAQs
How do I stop water leaking under my shower door?
Install a proper bottom sweep seal and a threshold strip. These components redirect water back into the tray.
Why is my framed shower door leaking at the bottom?
Likely due to worn-out seals, poor alignment, or a faulty threshold seals.
Do frameless shower doors leak more?
Only if not sealed properly. With the correct bottom seal for frameless shower doors, leaks can be eliminated.
What’s the best way to seal the bottom of a glass shower door?
Use a clip-on bottom sweep matched to your glass thickness and add a ramp-style threshold if needed.
What’s the best way to replace the seal on the bottom of a shower door?
Follow our full guide on [How To Replace Shower Screen Bottom Seals] — it walks you through every step, from removing the old seal to fitting the new one perfectly.
Don’t Let Leaks Win — Choose SIMBA Seal Solutions
At SIMBA, we specialize in shower door bottom seals and accessories for frameless, framed, and sliding doors since 1998.
SIMBA has been helping UK homeowners stop water leaking from the bottom of their shower doors — as one of the go-to suppliers for shower door seals in the UK.
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Factory Direct — Better value than big-name brands
- 10-Month Guarantee + Free expert advice before you buy
- Free UK Delivery — Arrives in 7–10 days
- Clear Install Guides — Step-by-step photos & video
- Thicker. Stronger. Better Fit. — Built to last longer than generic versions
- Lab-Tested Performance — We don’t just claim our bath seals work — we prove it
For under £20, you can stop the leaks with a proper bottom seal and shower threshold seal — protecting your floor from water damage, mould, and the daily hassle of mopping up.
Compare that with the hundreds you’d spend on repairs later. It’s a no-brainer.
Ready to Fix It?
If you're wondering how to seal the bottom of a shower door, this simple two-step method using a seal strip and threshold is your answer. No major tools, no need to re-install your door.
Just clean, clip, and seal.
Ready to stop water leaks for good?
This article is intended as general guidance and may not apply to all situations. It is your responsibility to determine the best solution for your own property and circumstances. SIMBA accepts no liability for any damage resulting from the use of advice and/or instructions contained in this blog.
Partial reference to source:
This article was edited by Laura.
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Author: Laura Liu & SIMBA Seal Expert Laura joined SIMBA in January 2017 and has since become an integral part of the team. As a seasoned content manager and seal expert, she oversees website optimization and specializes in crafting informative and engaging content about sealing solutions. Her deep knowledge of shower seal technology and market trends ensures SIMBA stays ahead in providing value to customers worldwide. |
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