Clean inside-corner finish for any PVC panel install

The PVC Wall Panel Internal Corner Trim is the part that turns a panel installation from "DIY" into "professionally fitted." It covers the join where two panels meet at a 90° inside corner, hiding any imperfect cuts and creating a watertight seal. One per inside corner.

What it does

• Conceals 90° inside-corner joints between two adjacent walls
• Watertight seal when used with mould-resistant silicone
• Available in three finishes — Black, White and Chrome
• Three thicknesses — 5mm, 8mm, 10mm to match your wall panels

Where to use

• Inside corners of bathrooms, shower cubicles and wet rooms
• Where two walls meet at 90° (e.g. a corner shower or alcove)
• Around bath edges where panels turn around the bath end

Specifications

• Length: 5mm & 8mm trims: 2600mm | 10mm trims: 2400mm
• Profile: U-shaped channel that sandwiches both panel edges
• Material: PVC (matches panel material for thermal expansion)
• Available thickness: 5mm, 8mm, 10mm — always match your panel
• Available colour: Black, White, Chrome

How many do I need?

Count the inside corners in your install. A typical UK bathroom has 2–4 inside corners. A shower cubicle has 2 inside corners (the back two). For an L-shaped wet room, plan extra.

How to install

1. Fit the trim to the corner first, before installing panels
2. Apply silicone inside both U-channels of the trim
3. Slide the first panel into one channel; slide the second panel into the other channel as you work into the corner
4. Run a final mould-resistant silicone bead along the trim edges for full waterproofing

Read our full PVC install guide for context.

FAQs

Do I really need an internal corner trim?
For wet areas: yes. Without it, water tracks behind the panels at the corner. For purely decorative dry-room installs you can sometimes mitre the panel cuts and silicone instead, but trims are simpler and more reliable.

Which thickness should I order?
Match your panel thickness exactly. 10mm panels need 10mm trims. Wrong thickness = visible gap or panel doesn't fit the channel.

Black, White or Chrome?
White trims disappear into white panels; Chrome matches modern bathroom fixtures; Black contrasts with light panels for a deliberate design feature.

Pair with

External corner trim for outside corners · End cap trim for exposed edges · Coving for ceiling joints