Shower Screen Seals: seal every gap on your glass screen

The three sealing points of a glass shower screen

Door: a magnetic seal (pivot) or lip seal (sliding) closes the vertical gap. Base: a bottom seal with a wiper lip stops water running out under the glass onto the floor. Wall and side panel: a U-channel or wall profile closes the glass edge to the wall, and on a walk-in a water deflector returns run-off to the tray.

Leaking screen? Watch with the water running to see which edge it escapes from — that tells you which profile to renew.

Glass thickness sets the profile

On frameless screens the glass thickness is decisive: 8 mm is today’s standard, 6 mm is common on older units, and 10 mm appears on large walk-ins and panels. Measure with a caliper and pick a profile with the right tolerance. Curved and folding screens use profiles shaped to match — check the shape as well as the size.

Frameless or framed: why the strip matters more on frameless glass

On a framed screen the seal sits inside an aluminium profile that does part of the sealing work. On a frameless screen there is no frame: the push-on strip is the only thing between the glass edge and the floor. If it hardens or slips, the water path is wide open — which is why frameless screens are the first place worn seals show up as puddles.

Frameless also means the seal is on show. A clear strip keeps the minimal look the screen was bought for, while a yellowed or clouded one is the first thing the eye catches. On frameless glass a seal swap is as much a visual refresh as a functional one.

Toughened glass: the seal adapts to the glass, never the other way round

Shower screens are toughened safety glass. Once toughened, the pane cannot be cut, drilled or trimmed — any attempt shatters it into granules. So a screen is never made to fit a seal; the seal always has to fit the screen. That makes the glass thickness the one measurement everything else hangs on.

Measure it at the open edge of the screen — the exposed glass edge at the entry or the top corner — with a caliper. Take the reading in two or three spots to rule out a measuring error, then match the profile’s tolerance range to it (4, 6, 8 or 10 mm are the common thicknesses).

Limescale film, glass corrosion or yellowed seal? Three problems, three fixes

A shower screen that no longer looks clear has one of three problems, and they need different fixes. A limescale film is a mineral deposit on the surface: a limescale remover or mild acid-based cleaner takes it off and the glass is clear again. Glass corrosion is different — years of hard water and heat etch the surface itself, and no cleaner can polish etched glass back; that damage is permanent.

The third case is not the glass at all: yellowed or clouded seal strips along the edges make the whole screen look tired. That one has the easiest fix — pull the old strips off and push new ones on. Before you scrub anything, work out which of the three you are actually looking at.

Read more: Why seals yellow — materials explained

Walk-ins and fixed panels: sealing without a door

A walk-in screen has no door — so there is no closing edge to seal. Sealing happens at two places only: along the bottom edge, where a water deflector guides run-off back into the tray, and at the wall, where a wall profile or U-channel closes the glass-to-wall joint.

The open entry is a splash zone by design. A deflector on the bottom edge limits how much water escapes, but no seal can close an opening that is meant to stay open — if the floor outside a walk-in gets wet, that is the concept, not a defect. Position and screen width control it, not a thicker seal.

Read more: Deflectors and bottom seals in detail