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What is BS EN 12056-5:2012?

BS EN 12056-5:2012 is a technical standard that specifically focuses on the planning, design, and installation of gravity drainage systems within buildings. This standard provides guidelines and requirements for the design and construction of sanitary pipework to ensure efficient and effective drainage.

The Importance of BS EN 12056-5:2012

Gravity drainage systems play a vital role in maintaining proper hygiene and sanitation within buildings. They are responsible for removing wastewater from sinks, toilets, showers, and other relevant fixtures, ensuring that it doesn't accumulate inside the building. Proper drainage systems not only prevent potential health hazards but also protect the structural integrity of the building itself.

BS EN 12056-5:2012 is crucial as it sets out the minimum requirements for the layout, sizing, material selection, and installation of sanitary pipework. It ensures that gravity drainage systems are designed and built to withstand the expected flow rates, avoid blockages, and prevent leaks or backflow.

Main Requirements of BS EN 12056-5:2012

This standard covers various aspects related to the design and installation of gravity drainage systems. It specifies the correct pipe sizes based on the expected maximum flow rates, taking into account factors such as the number of fixtures connected. The standard also provides guidance on how to calculate the hydraulic performance of the system to ensure its effectiveness.

In addition to pipe sizing, BS EN 12056-5:2012 defines the required slope for the pipework to ensure proper self-cleaning and prevent blockages. It also covers ventilation requirements to prevent the formation of foul odors and the occurrence of vacuum-induced pressure changes.

The standard outlines the materials suitable for use in sanitary pipework, considering factors such as durability, resistance to chemicals and temperature variations. It also provides guidelines for the installation of pipes, fittings, and fixtures, emphasizing the importance of proper jointing and support.


BS EN 12056-5:2012 is a crucial standard that ensures the effective design and installation of gravity drainage systems within buildings. By adhering to this standard, designers, engineers, and contractors can ensure that the drainage system operates efficiently, avoiding potential health hazards and building damage. Compliance with BS EN 12056-5:2012 provides peace of mind, knowing that the gravity drainage system will function optimally for years to come.

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