For a typical school wash trough, the tap count comes out of three measurements: the overall trough length, 400 mm centres between the tapware, and an end offset of roughly 200 mm to 300 mm.
On that layout, a 2400 mm school wash trough normally carries six tapware positions. The first and last taps sit 200 mm from the ends, with the rest at 400 mm centres.
An 1800 mm trough normally carries four. The first and last taps can sit 300 mm from the ends, again holding 400 mm centres between taps.
Both arrangements use the trough length efficiently while leaving students enough room to work.
How the tap layout is calculated
The layout starts with the preferred 400 mm spacing between users. The end positions are then adjusted inside the usual 200 mm to 300 mm range so the taps land neatly across the trough.
| Trough length | Normal tap count | End offset | Tap centres |
| 1800 mm | 4 taps | 300 mm | 400 mm |
| 2400 mm | 6 taps | 200 mm | 400 mm |
On a 2400 mm trough, the positions measured from one end are 200, 600, 1000, 1400, 1800 and 2200 mm.
On an 1800 mm trough, they are 300, 700, 1100 and 1500 mm.
That holds consistent centres while keeping the end taps within the preferred distance from each end.
Why 400 mm tap centres work well in schools
School wash troughs need to let several students wash their hands without wasting wall length. Spacing taps at 400 mm centres balances:
- how many students can use the trough at once
- practical elbow room between students
- efficient use of the trough length
- shorter queues during busy periods
- straightforward fabrication and plumbing coordination
Wider spacing cuts capacity. Tighter spacing lifts the nominal tap count, but students end up crowded and knocking into each other.
Why the end offset changes
The distance from the trough end to the first tap does not have to be identical on every job. Marko Stainless & Aluminium normally aims to keep the first and last taps around 200 mm to 300 mm from the ends.
The offset is chosen to suit the overall length while holding 400 mm centres. That is why a 2400 mm trough works with 200 mm end offsets and an 1800 mm trough works neatly with 300 mm.
Match the trough length to peak use
The measurements decide how many taps fit properly. The project team still has to choose a trough long enough for the demand.
A wash trough outside a busy student amenities block needs more capacity than one in a staff or support area. Look at the busiest realistic period rather than average use or total enrolment. Our guide to wash trough sizing and layout for schools and workplaces works through this in more detail.
If six students need to wash at once, a 2400 mm trough with six tapware positions may suit. If only 1800 mm of wall is available, forcing in more taps at tighter centres usually is not practical. A second trough or a revised layout will work better.
Confirm the tapware before fabrication
Six taps is not enough information to manufacture from. Before fabrication, confirm:
- tap make and model
- tap-hole diameter
- hob-mounted or wall-mounted installation
- required centres and end offsets
- waste position and splashback
- mounting arrangement
- architectural and hydraulic drawings
Tapware dimensions change hole sizes, clearances and the coordination with plumbing behind or below the trough. Confirming these early prevents site alterations and misplaced penetrations.
Do not apply drinking-trough layouts automatically
Wash troughs, drinking troughs, bubbler troughs and practical activities area troughs all do different jobs. Bubblers, bottle fillers and classroom clean-up taps need different operating space and different plumbing.
Confirm the fixture type before applying a standard tap layout.
School project and EFSG requirements
For NSW School Infrastructure projects, check the approved drawings and the applicable Educational Facilities Standards and Guidelines. Tap count, trough length, mounting height, plumbing and surrounding layout all need to suit the particular space.
Marko Stainless & Aluminium manufactures stainless steel school wash troughs to suit NSW School Infrastructure EFSG requirements where applicable, including the Wallsend pattern wash trough still used across NSW schools.
Having developed many of the trough patterns still in schools today, our team can help builders, architects and hydraulic consultants with practical layouts and fabrication details.
Frequently asked questions
How many taps normally fit on a 2400 mm school wash trough?
Normally six tapware positions at 400 mm centres, with the first and last taps 200 mm from the ends.
How many taps normally fit on an 1800 mm wash trough?
Normally four tapware positions, with 300 mm end offsets and 400 mm centres between taps.
How far should the first tap be from the end?
Marko Stainless & Aluminium normally aims for around 200 mm to 300 mm. The exact offset depends on the trough length and the required centres.
Can the taps be spaced differently?
Yes, where the application or the approved drawings call for it. Reducing the spacing purely to fit more users tends to create a layout nobody enjoys using.
Plan the tap layout before ordering
The normal tap count is not a guess. It falls out of the trough length, 400 mm tap centres and practical 200 mm to 300 mm end offsets.
Talk to Marko Stainless & Aluminium about the right length and tap layout for your project, and send through your drawings when you have them.
