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MDPE pipe, also known as medium density polyethylene pipe, is used externally for supplying water to a property, usually mains water, up to the stopcock of the building. This type of pipe is bright blue so it can be easily identified in the ground.
This pipe is great for long-term use to supply water to a property. It won't corrode or deteriorate underground, so there's a minimal chance that it'll need repairing or replacing. MDPE pipe is also stress-fracture-resistant, meaning it won’t break under pressure when underground.
MDPE pipe isn’t UV stable, meaning it must be run underground – this can make it more difficult to access if it ever does need repairing or replacing. This type of pipe cannot carry hot water, meaning its only use is as a mains supply pipe.
Underground pipe carries greywater and blackwater to the sewers from soil pipes. They’re terracotta coloured so they can be easily spotted underground for maintenance. You’ll find 110mm and 160mm underground drainage pipes, with 110mm most commonly used for domestic properties, whilst 160mm are used for commercial properties where the water volume is greater.
These pipes have a push-fit design meaning there’s no welding or tightening needed to install them. Underground pipes are made of PVC with a smooth finish. This improves water flow and reduces debris, helping to keep the pipes working well.
Underground pipes are not UV stable, and are therefore only suitable for underground use.
Soil pipes are made from PVC and are used to take black water and grey water from your toilet and sinks to the sewer. They’re big enough to allow solid waste to pass, and are vented near the top of a building to reduce odours and keep harmful gases away from the property. Soil pipes come in a variety of colours, and the colour chosen will often depend on the colour of the guttering.
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The simple push-fit design and sealing rings of soil pipes make them easy and quick to install. The PVC is a strong, lightweight material with high chemical and UV resistance, making it ideal for transporting waste and soiled water. This also means soil pipes don't need to be installed underground away from sunlight.
The main consideration with soil pipes is the issue of blockages. These will occur more regularly than other types of pipes because of the purpose of soil pipes – to transport solid and liquid waste to sewers. Additionally, soil pipes make up a complex system called a soil stack with different components that should be installed by a qualified professional, as mistakes could be harmful, costly and smelly!
There are two types of plastic plumbing pipes: PB (also known as polybutylene pipes) and PEX pipes (also known as cross linked polyethylene pipes). Pipe sizes are the diameter of the pipe; 15mm or 22mm are popular for domestic plumbing, whilst 28mm is used for commercial environments.
PEX is often viewed as a sturdier alternative to PB pipe. However, PB is more flexible and easier-to-manipulate. Both are quick and easy to install heat-free, ideal for tight spaces and protecting homes from heat damage. They’re interchangeable with other systems, and won't corrode over time with proper use.
Internal plastic pipes are not as robust as copper alternatives. They also cannot be used outside due to the increased risk of freezing as well as potential UV damage – both could cause the pipe to deteriorate and start leaking. If you have any water supply pipes on show, you may find copper alternatives are also more aesthetically pleasing.
Copper plumbing pipes were the pipe of choice before plastic pipes were invented, and are still used now – both externally and internally, as they’re UV stable. 15mm and 22mm diameter copper piping is used in domestic plumbing, while 28mm is used in commercial environments.
Copper pipes are robust and fire resistant, and prevent bacterial growth within the plumbing system. They’re also easier to recycle than plastic pipes. Copper compression fittings can be used with plastic pipes as they’re a type of flame-free copper fitting, making them reasonably flexible.
Copper pipes can be more difficult to install and repair than plastic pipes – although this shouldn’t be a problem for experienced plumbers. You'll also find copper pipes can't withstand acidic water. These pipes also come with a slightly higher price tag. Standard copper fittings cannot be used with plastic pipes as heat is required to connect them – making them less flexible than plastic plumbing unless you use compression fittings.
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