Collection: Vertical Side Seals
Achieving a perfect vertical seal relies on three essential factors: your glass thickness, the clearance gap, and the opening angle of your enclosure. Because vertical joints are subject to "door wobble" and structural movement, a precise fit is the only way to ensure a leak-free bathroom.
1. The Measurement Essentials
Before browsing, confirm your glass thickness (typically 4mm, 5mm, 6mm, 8mm, 10mm, or 12mm) using a caliper or ruler. Next, measure the gap between the glass edge and the wall—or the adjacent panel—in millimetres.
2. Matching the Profile to Your Enclosure
The shape of the seal is dictated by how your door meets the stationary surface:
-
Pivot or Hinged Doors: For frameless doors that swing outward, an h-shape profile or a bulb seal with a flexible fin typically provides the most reliable compression fit against a wall.
-
180-Degree Glass-to-Glass Joins: To bridge the gap between two inline panels, an H-shape seal or a Magnetic Strip set creates a secure, watertight closure.
-
135-Degree Angled Enclosures: Angled corner showers require a dedicated 135-degree Y-shape profile to accommodate the specific geometry of the glass.
- 90-degree corner shower enclosure: Magnetic weatherstripping is required to block water flow.
3. Professional Advice for Replacement
If you are replacing a worn-out strip, we suggest removing a small section of the old seal to inspect its cross-section. Matching the geometry of your existing profile is often the most straightforward way to ensure compatibility.
Why Choose SIMBA? Direct UK supply, durable co-extruded PVC, and fast, free delivery on all orders.
4-6mm Glass Bulb Seals Gap 7mm D456S7
4-6mm Glass Bulb Seals Large Gaps 8-12mm D456S12
For 8mm Glass Shower Door Bulb Seal Gap 4-7mm D08S7
For 10mm Heavy-Duty Glass Shower Bulb Seal Gap 4-7mm D10S7
Shower Door Vertical Bubble Seal & Fin 4-6mm Glass Gap 15mm DA456S15
H Shape Seal 4-6mm Glass Gap 3-6mm H456S8
4-6mm Glass H Shape Seal Gap 3-13mm H456S15
H Shape Seal 4-6mm Glass H456S20
2 Metre Vertical H-Type Seal 4-6mm Glass H456S2025
Rubber Seal For Simpsons Design Double Bath Screen 4-6mm Glass HH456
8mm Glass Premium H-Profile Vertical Seal HH08
10mm Heavy-Glass Hybrid H-Seal (Out-Swing) HH10
F Shape Shower Door Seal | 8mm Slim Fin | Fits 4mm, 5mm & 6mm Glass F456S8
Sliding Door F-Shape Seal FD456S1015
F-Type Sliding Screen Seal FD456S2025
F Shape Shower Door Seal | 12mm Standard Fin | Fits 4mm, 5mm & 6mm Glass F456S12
F Shape Shower Door Seal | 15mm 'Extended' Fin | Fits 4mm, 5mm & 6mm Glass F456S15
F Shape Shower Door Seal | 20mm Mid-Range Fin | Fits 4mm, 5mm & 6mm Glass F456S20
F Shape Shower Door Seal | 35mm Extra-Long Fin | Fits 4mm, 5mm & 6mm Glass F456S2535
F Shape Shower Door Seal | 8mm 'Discreet' Slim Fin | Fits 8mm-10mm Glass F810S8
Replacement F-Shaped Seals for Sliding Shower Enclosures 8-10mm Glass F810S12
Standard 15mm Fin F-Type Shower Seal For 8mm-10mm Glass F810S15
F Shape Shower Door Seal 20mm Mid-Range Fin For 8mm-10mm Glass F810S20
Extra Wide F-Shape Seal for 8mm-10mm Glass (35mm Fin) F810S2535
H-Type Side Seal Strip 8-10mm Glass H810S8
Replacement H-Profile Glass Seal H810S15
8-10mm H-Type Shower Door Seal H810S20
Standard h-Shape Shower Screen Seal 8-10mm Glass H810S2535
Engineered for Longevity: The SIMBA Material Standard
A vertical seal is only as good as the material it is crafted from. At SIMBA, we focus on the intersection of durability and aesthetics, ensuring our seals perform invisibly and reliably in the demanding environment of a British bathroom.
High-Performance Co-Extruded PVC
All SIMBA vertical shower door seals are manufactured using advanced co-extrusion technology. This process fuses a high-impact rigid PVC "anchor" with a soft, supple sealing fin.
- Translucent Clarity: Our translucent finish is formulated to stay clear, blending seamlessly with your glass panels for a minimalist, high-end look.
- Hygiene Focused: The smooth surface is specifically engineered to resist limescale build-up and mould growth, making it significantly easier to maintain than standard high-street profiles.
Tested for the Real World
We understand that a shower door is a high-traffic fixture. To ensure long-term performance, each profile undergoes rigorous stress testing:
- 30,000 Cycle Rating: Our seals are rated for over 30,000 open-close cycles, ensuring the flexible fins won’t crack or lose their "memory" over time.
- Thermal Stability: Unlike cheaper PVC that becomes brittle, our materials are formulated to maintain sustained flexibility in hot, humid environments. This ensures a consistent, watertight compression fit, season after season.
- UV-Resistant Formula: SIMBA seals include UV-stabilisers to actively resist yellowing, keeping your bathroom looking fresh and professionally maintained for years to come.
How to Install
Installing a vertical shower door seal is straightforward and requires no specialist tools.
First, remove the old seal by gently pulling it away from the glass edge.
Clean the glass surface with warm soapy water to remove any residue or limescale deposits.
Push the new seal onto the glass edge, starting from the top and working downward, ensuring the rigid U-channel grips the glass firmly.
If the seal is longer than required, mark the desired length and trim with sharp scissors or a craft knife for a precise cut to size.
For magnetic seals, align both strips on opposing glass panels to confirm correct polarity before final fitting.
Finding the Perfect Vertical Shower Door Seal for Your Enclosure
Water leaking through the vertical gaps of your shower is often caused by more than just a worn strip; it’s usually a mismatch of hardware and glass alignment. Whether you are dealing with a 90-degree corner joint on a quadrant enclosure or an 180-degree inline glass-to-glass overlap on a premium sliding door, the right vertical shower door seal must provide a seamless barrier without obstructing the door’s motion. At SIMBA, we understand that "universal" fixes rarely work for UK bathrooms, where hard water and constant steam challenge the integrity of your seals every day.
As a specialist manufacturer-direct supplier, we hold a database of over 9,000 seal profiles, ensuring we can replace almost any legacy strip from leading UK brands. Unlike cheap imports, our seals are crafted from high-clarity, REACH-certified PVC—free from harmful chemicals and engineered to resist the "pink mould" and yellowing common in high-humidity environments. By buying directly from the source, you gain professional-grade durability that has been tested for over 30,000 opening cycles.
Identify Your Profile:
- For doors that aren't staying shut or have a large "clashing" gap, explore our precision-aligned Side Magnetic Shower Door Seals.
- If your leak is occurring where two glass panels overlap or at the hinge side, browse our specialized F & H Shape Vertical Seals for a slimline, watertight fit.
Confused about measurements? Read our expert Masterclass: How to Identify & Fit Vertical Shower Seals