The previous page was too thin for a decision that affects leaks, falls and daily use. In a real bathroom refit, the tray lip is tied to floor construction, drainage depth, door seal, tile line and the person who will use the shower.
Shower lip and threshold options
| Option | Best fit | Watch-outs |
|---|---|---|
| Raised shower tray lip | Simple replacement where a step is acceptable and the waste route is already workable. | Step height, door seal and cleaning around the edge. |
| Low-profile tray | Modern refit where easier access is wanted but a full wet room is not needed. | Floor level, waste depth, screen seal and tray support. |
| Wet-room former or level access | Accessibility, future-proofing or a clean open shower layout. | Floor falls, tanking, drainage capacity and splash control become more important. |
| Upstand or raised edge behind tiles | Extra water-control detail at wall junctions. | Must be compatible with the tray, board, tile and sealant system. |
Shower threshold checker
This is a planning prompt for a measured survey, not a waterproofing specification.
What decides the right lip height?
- Tray manufacturer instructions
- Waste position and drainage depth
- Floor fall towards the drain
- Screen or door seal design
- Tile thickness and trim line
- Waterproof board and tanking route
- Step-in comfort for the user
- Future rails, seat or mobility needs
Leak-risk details people miss
| Detail | Why it matters | Planning move |
|---|---|---|
| Tray not fully supported | Movement opens sealant joints and lets water track behind finishes. | Use the support method specified for the tray or former. |
| Poor fall near open screen | Water escapes before it reaches the waste. | Check fall direction before choosing a walk-in layout. |
| Wrong floor build-up | A low tray may become a step if the surrounding floor is not planned. | Set the finished floor levels early. |
| Ignoring access | A small threshold can still be a daily obstacle. | Ask who will use the shower in two or five years, not only today. |
Sources and checks used
- Scottish Government domestic technical handbook: domestic building standards context for bathrooms, access and moisture control.
- Water Regs UK: UK water regulations reference point for plumbing and water-supply compliance topics.
FAQ
What is shower base lip height?
It is the raised edge or threshold where the shower base, tray or wet-room floor meets the surrounding floor and screen. It affects water control and step-in access.
Is a low shower threshold always better?
Not always. Lower is easier to step over, but the drainage fall, screen seal, tray design and waterproofing still have to control water properly.
Can a shower tray lip be removed?
Do not cut or alter a tray lip unless the product and installer route allow it. The edge may be part of the water-control system.
