Last updated: 2025-12-19
The Reality Check: A staggering 43% of frameless shower doors leak across the UK. It’s usually not because of poor glass—it’s because the seals have failed.
Frameless glass is stunning, clean, and modern. But this minimalist design requires precise sealing, making leaks a common frustration.
SIMBA Authority
At SIMBA, we’ve been designing and manufacturing specialized shower door seals for over 20 years. We supply seals to frameless brands across the UK and Europe.
In this guide, we’ll show you exactly why leaks happen and provide straightforward solutions to fix them without expensive professional repairs.
Why Frameless Shower Doors Leak
Many assume leaks mean damaged glass or faulty installation, but the real culprit is usually the seal itself. Frameless doors lack a traditional bulky frame, meaning the seals are your only barrier.
Common leak points include:
- The Bottom: The most frequent area for water escape.
- The Hinges: Small gaps inherent in the design.
- The Corners: Where vertical and horizontal seals meet.
- Sliding Edges: No frame to guide the water back into the tray.
Good News: Leaking doors don't always mean you need new glass. With the right SIMBA seals, you can stop the water for good.
Targeted Fixes: Where Is Your Water Escaping?
1. The Universal Fix: Bottom & Corner Leaks
If you're dealing with standard leaks at the bottom edge, the solution is often a new, high-quality shower door bottom gasket.
Want to know more? Head over to our expert guide: Shower Door Leaking at the Bottom? Here's How to Seal It Properly.
For complex corner issues, refer to: The Definitive Guide to Fixing a Corner Shower Leak.
2. Fixing Sliding Door Bottom Leaks
Most bottom leaks on frameless sliding doors happen because there is no bottom seal. Check if there is a clear plastic strip running along the bottom edge. If not, that's the problem.
Our Solution: We recommend a zero-gap seal like the S6DTL. It fits perfectly to block leaks on sliding doors.
If a seal is present but the floor is still wet, add a Threshold Seal to the shower tray to act as a physical dam.
3. How to Stop Hinge Leaks
Tiny gaps near hinges are often part of a frameless design. The trick is clever trimming of a hinge-side seal strip.
Read more: How to Stop Shower Screen Leaking at the Hinge.
Special Case: Mode Double Bath Screens (Folding)
If your folding screen leaks from the middle joint, it's often due to "Reversed Installation." To allow the door to fold inwards, the vertical H-shaped seal must be installed backwards.
The Best Solution: Install a Threshold Strip across the entire bottom length. This dam catches water that the vertical seal misses.
Critical Mistakes to Avoid
⚠️ Don’t Seal It with Silicone
Many reach for silicone, but we advise against it. Silicone discolours, turns black with mold, and is a nightmare to scrape off later. Stick to high-quality PVC seals.
Read more: 11 Common Shower Door Seal Slip-Ups.
Conclusion & SIMBA Support
Whether it’s the bottom, hinge, or corners, the solution is simple: Use the right bath sealing strip.
Now you know how to measure and how to choose quality.
Still Unsure? Send Us a Photo.
Just email a photo of your existing seal to info@showerdoorseal.uk. Our specialists will match the perfect seal for you—free and professional.
FAQ: Frameless Shower Leaks
Do frameless shower doors always leak?
Not if they’re sealed correctly. It’s all about the right profile and correct installation.
Can I fix a leak myself?
Yes! Replacing a seal is a 5-minute DIY job. No tools needed.
What seal do I need for the bottom?
Check your glass thickness and gap size. Learn how to measure here.
Related Guide: Shower Door Screen Seals: The Complete Buying Guide