Last updated: 2025-12-18
In our previous guide, we explored why there is a gap in your shower door and established that these clearances are a normal part of frameless design.
However, once you’ve identified the size and location of that space, the next critical question is: Should you seal it, or just let the water run?
Best Methods to Fill and Seal a Bottom Shower Door Gap
For a 100% watertight bathroom, a dual-protection strategy is your best bet. We recommend combining a professional bottom shower door seal with a threshold seal.
Option 1: Bottom Seal Strip + Threshold Seal (Top Choice)
This is the ultimate way to fix a shower door gap at the bottom. It’s the #1 choice for UK DIYers because it’s simple, fast, and highly effective.
✅ Pros:
- Double Barrier: The seal deflects spray, while the threshold acts as a dam.
- Universal Fit: Options for all glass thicknesses (4mm-10mm) and gaps from 1mm to 35mm.
- Zero Damage: Easy to install or replace without marking glass or tray.
❌ Cons:
- Needs regular checks for wear and tear
- Can come loose if not installed properly
How to Seal Side & Wall Gaps (Vertical Seals)
If water is escaping from the side or your old strip has snapped, consider these three specialized solutions:
1. Glass-to-Wall Seals (Closing the Side Gap)
Common leak site where glass meets the wall. Best for uneven walls or wobbly hinges.
Solution: A vertical fin seal with a flexible soft wing.
Shop Wall Gap Seals2. 180° Glass-to-Glass Seals (Magnetic)
Typical for bifold doors or fixed screens where panels meet in a straight line (Standard gap: 22mm).
Pro Tip: Use Magnetic Seals for a strong, watertight "click" every time.
Shop 180° Magnetic Seals3. Sliding Shower Door Seals (Overlap Gaps)
Stops water at the overlap without jamming the glide mechanism.
Solution: F-shaped seal, designed specifically for slim-profile sliding structures.
Explore Sliding Door Seals