Frequently Asked Questions

Please don't hesitate to contact us with any questions.

What is the standard channel width?

Our open channel widths are available as standard in widths of 200mm upwards working in 50mm increments (200/250/300/350 etc).

However we can adapt these widths to suit the requirements of your specific project, for example to fit with specific tile modules and allowing for half a thickness of grout. We have produced channel systems that do not require any cutting of tiles i.e. to align exactly with the grout lines.

What is the minimum / maximum width of a channel?


The minimum width of channel we produce with a removable grating is only restricted by the effect of the reduction in capacity by the size of the channel bore.

We can produce systems with a grating of 100mm, however when a ledge is designed into the channel system to support the grating the effective bore of the channel reduces to around 75mm.

All of our standard drainage channels have been designed to optimise the channels effectiveness in combination with it’s mesh grating and outlet. If a very minimal visual impact is required for the channel system we have a number of slot and compact channel systems that are available to suit various floor finishes and specifications. These have all the benefits of the open channel systems, are entirely manufactured from stainless steel but include a drainage slot rather than removable grating.



In theory the maximum width of our open channel systems (with grating) is only restricted by the width of stainless steel sheet sizes the channels are manufactured from, that are commercially available.

In practice a number of elements effect the viability of a very wide channel system such as the load-bearing capacity of the grating, the infill of the grating, transport available and access in to the building.

Generally, systems wider than 1,000mm are very rarely required.

What is the maximum length a channel can be?

Quite simply there is no maximum length for our channel systems. Over the past thirty years we have manufactured a huge variety of channel systems. From systems that run for hundreds of metres in a single run to food production facilities where the channels are networked together.

However, the longer the channel, the deeper into the ground it needs to go to allow it to keep it's fall. Therefore the available depth should be a consideration. Another consideration is the type of transport and access into the building on a regular basis.

We always aim to minimise the number of joints in our channel systems to decrease the installation time required on site. As standard our channel systems, no matter how long the system is, will be supplied in lengths up to 6 metres long. Experience has taught us that sections longer than this become unwieldy and difficult to install.

What is the maximum/minimum depth of a channel?

The maximum depth of our open channel systems depends on the selection of channel type and its width.

For further queries please Contact us

How do the channels join together?

We have a number of options available for the jointing of our channels systems. As standard all our channel systems are supplied with fully welded endplate outlets for connection to a trapped gully or drain. Where possible we try to avoid the requirement of a joint to minimise the installation time required for our customers however when transport or access into the building requires it we have three options available to us for jointing the supplied channel sections;

 Flanged Joint

A water-tight mechanical joint including a nitrile gasket this assembly has been used successfully for over twenty years in environments as varied as food factories and leisure centres. 

Welded joint

When specific specifications require a fully welded channel joint or the fabric of the building restricts the depth available so negating the possibility of using a flanged joint we utilise a site welded joint. The channel is supplied with an outer sleeve and connecting brackets to enable the channel to be levelled, installed and prepared for a welder to simply complete the welding of the two butted channel faces. 

Sleeve joint

For installations that do not require a completely water-tight joint we can supply the channel system with a sleeve joint that can be utilised with a form of sealant to form a channel joint.

How do the channels connect to the gullies?

All our channel systems are available with connecting sipgots to work with our range of trapped gullies. The connection between the two is formed using a neoprene o-ring that fits around the fully welded spigot from the base of the channel system and then forms a seal as it is inserted into the gully body. This o-ring enables all our channel and gully systems to be height adjustable and fully rotatable – enabling the gully to be connected to the foul drainage system then in a second fix the channel (or gully raising section) to be raised to finished floor level and rotated so that it aligns aesthetically within the room it is installed.

How are channels leveled?

All channels are supplied as standard with levelling feet at each end of the channel systems and either side of channel joints. These simple but effective assemblies enable each corner of the system to be levelled and easily adjusted.

Our overhead levelling system can be utilised on long channel runs or if cutting into an existing slab. This proven design not only enables the channel to be levelled from above (the channel is suspended from a cross strap) but once the feet of the assembly are secured down, ensures the channel does not rise when the backfill is installed.

Please contact us for further information.

What is the typical fall in a channel?

The typical fall of our channel systems is 1:100. Where the fabric of the building allows we aim to utilise this proven self cleansing gradient as standard. However on occasion due to restrictions or length of the system the channel we can manufacture the channel system to whatever depth is available to us maximising the effectiveness of the channel system – just one benefit of manufacturing the channel system ourselves and having complete control over its design.

How do I partition over your channels?

To maximise the effectiveness of a channel system but minimise the builders work required we have the ability to produce a channel system for a block of shower cubicles in line. This minimises the builders work required by providing only one hole through the floor for the outlet and also reduces the maintenance required for the outlet and collection of debris. When this is the case the shower cubicle walls are usually of two types; a glass partition that is raised off the floor or a builders work wall that sits on FFL. When a wall is built as a partition we can provide the channel with solid plates for the wall to be built on. This enables the channel to continue under the wall with effluent flowing under the cubicles to the outlet.

Please see our case study on 1Rebel fitness clubs where this design was utilised on all the channel systems.

What is the maximum /minimum sizes of the grating?

All our gratings are available in any width, length or depth. However we stock gratings to suit 50mm increments of channel width from 150mm wide. All gratings have different variables depending on their use; slip resistance, mesh size, frame bar and load bar dimensions. Depth is usually dependent upon load bearing capacity working in increments of 10mm from 20mm deep. For more information and advice please don’t hesitate to Contact us.