More information about drain channels:Domestic, commercial and industrial - A15, B125, C250, D400, E600 & F900 Systems available
Read Our 'How to Install Channel Drainage' Guide
If you’re looking to prevent standing water on a large paved, tarmacked or concreted area you may be considering installing drainage channels.
A drain channel provides a neat, tidy and fairly simple drainage solution – but unless it’s installed properly, you might not get the result you were hoping for – and, if you’re not careful, you can sometimes end up just moving your water problem somewhere else. As such, we’ve put a guide together that goes into detail about:
- What drain channels are and some typical uses
- The different components in a typical installation
- The 11-step process of installation
- Some important dos and don’ts
What is a channel drain?
Channel drains are occasionally referred to as linear or Aco drains – and the chances are, you’ve probably walked or driven over one in the last 24 hours. They are a completely unobtrusive, neat and tidy drainage solution that’s used everywhere from the smallest internal domestic settings, right up to large scale industrial locations.
Despite a neat and tidy presentation, a drain channel will move large quantities of liquid. Sections of channel drain are much longer than they are wide, giving enormous volume - and have a cross-section design that contains the flow from the surrounding surfaces.
Black Plastic channels or composite channel options are the most commonly installed. Grate covers can also be either plastic or composite, occasionally cast iron or stainless steel – and sometimes one-piece formed to increase strength.
Domestic channel drainage usually has a load capacity of 5 tonnes – with a 1.25 tonne point load; making it ideal for driveways, paving and patio areas. Commercial channel drainage often has a greater load capacity, making it suitable for even the most testing industrial setting, in fact, it is even often used to keep commercial runways clear of standing liquids.
Drainage channels are suitable for an enormous range of settings.
Black domestic drainage channels are commonly used on driveways, patio areas, pavements and conservatories – and sometimes in wet rooms, kitchens and garages.
Commercial channel drainage appears in countless settings, particularly because of its increased load tolerance – making it ideal for areas that see heavy footfall or traffic, such as building entrances, pedestrian precincts, car parks and railway platforms. The large load capacity also makes it a viable option for swimming pools, parks, fountains and outdoor sports areas too.
Components and options:
There are typically 6 components that feature in a standard installation, they are:
- Drainage channel sections: The main part of the drainage installation, usually supplied in 1m lengths and coming with slotted ends, allowing for quick locking together of sections. Each section will have an outlet in the base that allows for downward drainage into a 110mm sewer connection.
- End outlets: An end outlet allows a channel drain section to be connected to a standard (usually 110mm) underground system at the end of the run, rather than the bottom.
- Grating: Usually made of PVC, composite or stainless steel, the grating sits virtually flush to the surrounding area, providing a non-slip surface for overhead traffic but adequate access to the channel below.
- End caps: End caps allow you to put a tight seal on the highest end of the installation or specific run.
- Quad sections: A quad section allows for up to 4 standard sections to be connected at 90-degree angles, allowing the installation to work around corners – or meet another section at a T-junction.
- Sump units: A sump is optional – but offers a silt basket that helps to prevent blockages – and usually includes a trap that’ll prevent any odour relating to standing water.
Components are typically bought individually, although some manufacturers, such as Flexseal, offer garage packs – a kit that usually contains 3 x 1m channels, an end cap and an end outlet.
If you’re keen to keep your project as green as possible, the idea of plastic drain channel and composite channel drainage might not sound so appealing – but don’t worry, there are fully recycled (and recyclable) options.
It’s worth looking at the EnviroChannel range from PDS if yours or your client’s carbon footprint and green credentials is a factor in your material selection. You won’t be compromising on strength either, the one-piece construction offers an increased load tolerance over virtually anything else on the market.
We’ve broken the installation of domestic drain channel down into 11 steps – with some detail around what you should do at each point:
You should start by digging a trench for your installation. You’ll need to go deep enough for at least 50mm of compacted sand as a base – and wide enough for a minimum of 100mm backfill of concrete on either side.
Attach a string line to indicate the finishing height of the grate. This should be 2mm lower than the surrounding surface level when finished.
You should allow a 1:200 fall: 5mm for every 1m channel drain section.
Installation of sections should begin at the lowest point – where your section meets the drain. Start with complete channel sections – and use any section that’s required cutting to length at the end; the highest point, furthest from the outlet.
When your first section is in place, subsequent sections will locate themselves with the help of the connecting slots at both ends of the sections and quad connectors. Sections should be installed with the grate in place, allowing for height accuracy against surrounding surfaces.
Fit an end cap to your final section, prior to locating it into your trench. The end cap should always feature at highest point.
The locating grooves on each section should be sealed with silicone sealant to improve leak resistance and increase durability.
Using either an additional end cap or the preformed channel bottom moulding, attach the section to your desired 110mm underground drainage, allowing collected liquids to disperse.
When your sections are in place – but prior to pouring concrete – protect the grated sections with a heavy duty exterior masking tape. Ensure you mask completely, as the grate is often (but not always) designed to be removed. Make sure you use a tape that’s designed to stay in place for at least the amount of time it will take for your concrete to set.
Pour your concrete to create a 2mm height difference above the grate section of your components.
The next step involves waiting! You should leave your concrete for at least 72 hours, allowing adequate curing time before exerting any pressure on the components. This includes weight – so avoid walking or crossing the drains with vehicles, and also includes removing the grate, as the upward pressure could dislodge the drain section body if concrete isn’t 100% set.
Installation do's and don’ts:
Our 11-step guide is fairly comprehensive and will cover what’s required, whether you’re fitting plastic channel drainage or composite channel drainage. However, there are some crucial dos and don’t that you need to make sure you observe.
DO: Start at the point where your drain sections will meet the drainage run or soakaway. This is likely to be a fixed point – so, if you start elsewhere, even a slight miscalculation or variation in the ground can lead to major adjustments being required.
Choosing the right products
Even following our guide perfectly, your job and results can still come up short if you don’t select the right products for your channel drain installation.
Quality materials should be guaranteed against breakage before, during and after installation. Also, look for components that are compliant with BS-EN1433 standards and ideally meet a load classification of at D400 kN – as well as carrying the mark of conformity and the British Kitemark Certification Mark.
The EnviroChannel D400 range delivers these assurances – as well as being an exceptionally priced and environmentally sound option. You can visit EasyMerchant’s EnviroChannel D400 product pages to read about them in more detail and see some easy-to-follow installation videos.For domestic channels, you can visit EasyMerchant's Plastic Channel Drainage product pages here for more information and prices.