Technological Innovation

What is BS EN 12056-5:2013?

BS EN 12056-5:2013 is a professional technical standard that focuses on drainage systems for buildings. It provides guidance and requirements for the design and installation of internal gravity drainage systems. This standard was developed by the European Committee for Standardization (CEN) in collaboration with industry experts.

Key Features of BS EN 12056-5:2013

The standard defines various aspects related to drainage systems, including pipe sizing, gradients, flow rates, and components. It covers both domestic and commercial buildings, taking into account factors such as water usage, occupancy levels, and environmental considerations. The goal is to ensure safe and efficient removal of wastewater from buildings, reducing the risk of flooding or blockages.

BS EN 12056-5:2013 specifies the requirements for ventilation and air admittance valves, inspections and testing, material selection, and maintenance. It also addresses issues like noise reduction and prevention of foul odors. Compliance with this standard helps architects, engineers, and plumbers in designing, constructing, and maintaining effective drainage systems.

Benefits of BS EN 12056-5:2013

Adhering to BS EN 12056-5:2013 offers several benefits. Firstly, it ensures the safety of occupants by preventing drainage-related accidents or health hazards. Proper pipe sizing and gradient calculations prevent blockages and stagnant water, reducing the risk of bacterial growth and foul smells. Compliance also helps in avoiding flooding, which can cause significant damage to properties.

Additionally, following this technical standard improves the overall performance of drainage systems. Accurate pipe sizing and flow rate calculations enable efficient removal of wastewater, reducing the pressure on the system and minimizing the potential for leaks or pipe bursts. The use of approved materials and regular maintenance further enhances system longevity and functionality.


BS EN 12056-5:2013 is a crucial technical standard for ensuring the design, installation, and maintenance of effective drainage systems in buildings. Compliance with this standard provides numerous benefits, including enhanced occupant safety, prevention of flooding and blockages, and improved system performance. Architects, engineers, plumbers, and building owners should familiarize themselves with the requirements of this standard to ensure the successful implementation of drainage systems that meet industry best practices.


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