Shower Door Seals: the right seal for your glass shower door

Which shower door seal for which door?

Pivot and hinged doors almost always close onto a magnetic seal: two magnetic profiles on the door and fixed panel pull together and seal the vertical gap. If the old magnetic strip sits loose or the door no longer clicks shut, the magnet has usually failed or the profile has warped.

Sliding and bi-fold doors have no magnetic contact, so they use a lip (wiper) seal: a soft TPE or silicone lip that presses against the glass or wall. At the base, a separate bottom seal stops water running out under the door.

Measure the glass thickness and gap first

The number-one buying mistake is the wrong glass thickness. Measure the edge with a caliper in a few places (4, 6, 8 or 10 mm are common in the UK and US) and pick a profile with the matching tolerance. An 8 mm seal on 6 mm glass sits loose and leaks; the wrong way round it will not push on.

The second value is the gap size: the distance the lip has to bridge between door and fixed panel. A lip that is too short will not close a large gap even if the glass thickness is right. Measure it on the old seal or across the gap with the door shut.

90°, 135° or 180°: get the magnetic closing angle right

Magnetic shower door seals close at a fixed angle, and it has to match your enclosure shape. A corner-entry enclosure, where two doors meet at a right angle, closes at 90°. A pentagon enclosure with its cut corner closes at 135°. A straight front or a recess (alcove) door, where door and fixed panel sit in line, closes at 180°.

You can read the angle off the old seal: look at the magnet faces end-on and note how the two profiles meet when the door is shut. Fit the wrong angle and the magnets meet askew — the door will not pull flush, leaves a vertical gap and drips exactly where the seal should work hardest. If you are unsure, the configurator asks for your enclosure shape and only shows profiles with the matching angle.

Read more: Find your seal in the configurator

Closing edge, hinge side, bottom edge: where each seal sits

A glass shower door carries up to three different seals. The closing edge takes the magnetic or strike seal that pulls the door shut. The hinge side often has a slim lip profile that covers the pivot gap. And along the bottom edge sits the bottom seal, which has the hardest job: bridging the gap between glass and threshold on every shower.

That bottom profile is usually a hollow-chamber design — in the UK widely known as a “bubble seal”, because the soft air chamber compresses against the threshold as the door closes. It is a separate part from the vertical seals and wears at its own pace, so you can replace it on its own.

Read more: Bottom seals and sweeps in detail

Five common buying mistakes

Most returned shower door seals fail on one of five points. First: the wrong magnet angle — a 180° profile on a 90° corner entry will never close flush. Second: guessed glass thickness instead of a measured one — “it looks like 8 mm” is how loose seals happen. Third: ordering the exact length with no cutting reserve, so one slip of the knife leaves the strip short.

Fourth: fitting the seal with the lip facing the wrong way, so it channels water out of the shower instead of back in. Fifth: buying a magnetic profile for a sliding door — sliding doors never close onto a magnet, they need a lip seal. Each mistake is avoidable by measuring the old seal and checking the door type before ordering.

Replace the seal or the whole door?

Seals age much faster than the rest of the door. The glass is toughened and effectively wear-free, and hinges last decades — but the soft plastic of a seal loses plasticiser, hardens and cracks long before anything else gives up. A leaking door is therefore almost never a broken door.

The practical rule: if the glass is undamaged and the hinges still hold the door true, a new profile restores the door completely. Replacing the whole door only makes sense when the glass itself is chipped or the hinges are worn beyond adjustment.