110mm Pipe
(7 Products)110mm Pipes provide the standard conduit for gravity-led waste management, facilitating both subterranean water removal and internal sanitary disposal. Engineered from high-grade uPVC, these pipes ensure efficient flow and long-term durability for underground drainage networks and soil vent systems across residential and commercial developments.
Engineering & Specification Requirements
Specifying 110mm piping is a technical necessity governed by Building Regulations Part H. This diameter is the minimum required for soil stacks carrying solids, as it provides the necessary bore to prevent blockages while maintaining the correct air-to-water ratio for efficient siphonic action. The 110mm dimension refers to the outside diameter (OD), ensuring a universal fit across different manufacturers' fittings, including bends, junctions, and manhole bases.
The utility of 110mm pipes depends on their application environment. Underground drainage pipes (usually terracotta-coloured) are designed with specific wall thicknesses to withstand the loading of soil and traffic, whereas soil pipes (usually grey, black, or white) are UV-stabilised to prevent brittleness when exposed to sunlight on external walls. Both systems rely on a smooth internal bore to maintain a high flow velocity, which is critical for the "self-cleansing" of the drainage run.
Application & Format Selection
- Primary Soil Stacks: 110mm PVCu soil pipes used vertically to carry waste from upper-floor bathrooms to the ground-level drain.
- Underground Foul Drainage: 110mm terracotta pipes used for horizontal runs beneath the ground to transport waste to a public sewer or septic tank.
- Surface Water Systems: 110mm piping utilised for collecting rainwater from multiple downpipes into a single storm drain or soakaway.
- Radon Venting: 110mm pipes used beneath floor slabs to safely vent ground gases away from the building.
Frequently Asked 110mm Pipe Questions
Is 110mm the same as 4-inch drainage pipe?
While often referred to interchangeably, 110mm is the metric standard for plastic pipes, whereas 4-inch usually refers to older salt-glazed clay or cast iron pipes. To join the two, you will require a specific flexible coupling or a 110mm-to-clay adaptor.
Can I use 110mm soil pipe for underground drainage?
Standard soil pipe (usually black or grey) is not UV-stabilised or impact-rated in the same way as terracotta-coloured underground pipe. While the diameters are the same, you should always use the specific orange-coloured pipe for subterranean work to ensure long-term structural integrity.
How do I cut 110mm pipe correctly for a leak-free joint?
Cut the pipe square using a fine-toothed saw and, crucially, chamfer the end at a 15° angle. Removing the sharp edge and burrs prevents the rubber ring seal from being pushed out of its seat when the pipe is inserted into the socket.
