What do you know about Threshold Drains? Is that something you should have?
Don’t worry, we are here to solve your puzzle.
Threshold drainage is a drainage system, usually installed in the doorway, public pathway, or on a property. It collects and directs water to a different location to optimise the draining process. The slim design makes the threshold drain suitable for patios, pathways, walkways, door threshold, and block paving areas.
Unlike the traditional method such as the clay dish channel (see image below), the threshold drain comes with a grating top that covers the recessed area (see image below). Therefore, it provides a safe environment for pedestrian, especially beneficial for people with restricted mobility; also creates a beautiful profile that matches the area.

A clay dished channel drain between the road and pavement.

A finish look of an anodized aluminium silver grating threshold drain installed in a rear grass garden.
Threshold Drain Features
- Easy to install
- Simple connection to a standard underground drainage outlet
- Removeable heel guard
- Fully compliant and certified to load class A 15 BS EN 1433:2002
- Disabled access friendly
Why Aluminium
Other than aluminium, there are types out there that are made from galvanized steel. Although galvanised steel also does the job, the surface is rough. Which makes it more difficult to clean and increase the chance of stains. Therefore, galvanized steel is usually used at places like industrial buildings. Whereas aluminium is light weighted; corrosion-resistant; has a higher thermal conductivity; and with a modern, aesthetically pleasing profile. As a result, aluminium will give you a longer-lasting threshold drain, since it is less sensitive to wear and tear.
Consideration Before Purchasing
A poor-quality drainage system could cause a lot of problems, such as floods or property damage. While traditional drainage can help with water flow, our drain also acts as a barrier, providing superior drainage. Could threshold drain be the best solution for your specific drainage needs?
- Overflow
Threshold drain is designed to channel up to 40 litres of water per minute. You should be mindful of the flow rate in order to lower the risk of potential overflow. - Threshold Level
It should be noted that the threshold drain should be installed 3mm to 5mm below the touching paving level. The depth will give the rainwater enough space to drain. Even in heavy rain condition, they won’t flood above the paving. - Pair Up
If your domestic drain is unable to handle the increased flow rate, you can direct the threshold drain to another drainage system. We recommend combining an Alusthetic aluminium threshold drain with a soakaway crate.The soakaway crate would collect the water and distribute them slowly and evenly to the ground. Please beware of the crate location, underneath the surface has to be soil for the system to work.
Threshold Drain Accessories
With the natural shape of the threshold drain, it is difficult to build a complete drainage system on its own, especially in a small area. Therefore, we recommend our customers use some, if not all of our drain accessories, in order to create the best drainage route.
Alusthetic Corner Unit
Just as the name intended, this corner unit helps the drain turn corners or goes to another angle.
Alusthetic Tee Piece
Similarly, the tee piece helps the drain to change the angle, and gain extra access for additional drainage design. Wherefore increase the performance of the drainage system.
Including the threshold drain, both corner unit and tee piece comes in three profiles. With silver and black being anodized aluminium and a steel CorTen.





