If your shower screen leaks water or you notice limescale at the base, it’s time to check the rubber seal and the bottom water deflector. Here you will find the different types of seals for shower screens, how to measure them and step-by-step instructions for installing them without any complications.
1. Types of seals and where they are used
1.1. Rubber seals for shower screens
They seal the joint between the glass and the profile to prevent leaks.
1.2. Lip-type rubber seal for shower screens
For the edge of fixed or movable glass, it accompanies the closure without forcing.
1.3. Coextruded profiles for shower screens
They combine a rigid body and a flexible wing, offering better watertightness and durability.
4. Lower water seal for shower enclosure profile
Creates a small barrier at the bottom that returns water to the tray.
2. How to choose the right size
Choosing the right size is key to ensuring that the seal fits without gaps or friction. Measure the thickness of the glass, check the geometry of the edge and the actual space to be covered at the base. With this information, you can choose a profile and a water seal lip that will fit perfectly and prevent leaks.
- Glass thickness: 6, 8 or 10 mm are the most common. The joint groove must fit without gaps.
- Lip height: if there is leakage at the base, look for longer lips on the lower weatherstrip.
- Radius and geometry: check whether the edge is straight or curved.
- Material: EPDM or TPE for better resistance to hot water, limescale and cleaning products.
3. Basic step-by-step installation
Before installation, prepare the surface: clean off any limescale and soap residue, dry thoroughly and have a cutter, cloth and tape measure handy. Place the seal without stretching it, fit the weatherstrip firmly and carry out a quick water test to check for leaks.
- Cleaning: descale and dry the glass and profile thoroughly.
- Cutting to size: use a sharp cutter and guide for straight cuts.
- Fitting the seal: fit from one end of the glass without stretching the material.
- Installing the lower water deflector: press until you hear the “click” of the fitting. Check that the lip rests on the tray.
- Watertightness test: turn on the water and check the seals and corners.
4. Signs that you need to replace the seal
You will know that it is time to replace the seal when the rubber is stiff, cracked or whitish, if puddles appear next to the bottom profile, if there are leaks around the corners or if you notice that the lip no longer rests properly on the tray. It is also a sign of wear if it creaks when opened, the panel loses its fit or, despite cleaning the limescale, drops continue to filter through after showering. If any of these symptoms occur, replacing the seal will restore the watertightness and extend the life of the screen.
5. Common mistakes and how to avoid them
- Choosing a lip that is too short: it does not return the water to the tray.
- Installing with dirt or moisture: reduces grip and service life.
- Stretching the seal when fitting: it then shrinks and leaves gaps.
Do you need a custom-made weatherstrip?
At ISOGOM, we manufacture custom-made profiles and seals for manufacturers and installers. Check out our processes and certificates on the Quality page and tell us about your case.
