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The standard is a foundational document for sanitary engineers, plumbers, architects, and building designers involved in waste water management within the UK and Europe. As part of a larger series, Part 1 provides the general and performance requirements for gravity drainage systems inside buildings.
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Understanding BS EN 12056-1: The Standard for Gravity Drainage Systems Inside Buildings
To ensure your plumbing and drainage layouts comply with modern building regulations, always cross-reference BS EN 12056-1 with national building codes, such as Building Regulations Approved Document H in the UK.
Prevents the entry of foul air into habitable spaces. Standards like BS EN 12056-1 are copyrighted intellectual
| Part | Title | Description | Best For | | :--- | :--- | :--- | :--- | | | General and Performance Requirements | Lays out the fundamental requirements, definitions, and performance criteria that all gravity drainage systems must meet. Think of this as the overall rulebook that sets the baseline for every other part. | Architects & engineers who need the big-picture requirements. | | Part 2 | Sanitary Pipework, Layout and Calculation | Focuses specifically on the pipework for wastewater from sanitary appliances like toilets and sinks. It details how to calculate pipe sizes, design the layout to ensure proper self-cleaning flow, and prevent issues like trap seal loss. It supersedes the older national standard BS 5572:1994. | Sanitary engineers designing "soil and waste" systems for bathrooms, kitchens, and utility rooms. | | Part 3 | Roof Drainage, Layout and Calculation | Provides the design methods and calculations for gravity roof drainage systems. It helps engineers determine the required number and size of outlets and pipes to handle specific rainfall intensities. The standard is based on modern hydraulic and meteorological knowledge. | Civil & building services engineers designing roof drainage for any building. | | Part 4 | Wastewater Lifting Plants - Layout and Calculation | Covers systems where gravity alone isn't enough, such as in a basement bathroom. This part deals with pumps and lifting plants to move wastewater up to the main gravity sewer. It provides guidelines for their layout, design, and calculation. | Engineers designing drainage for below-ground areas or unusual site conditions. | | Part 5 | Installation and Testing, Instructions for Operation, Maintenance and Use | Focuses on the practical, on-site aspects. It sets out the principles for how gravity drainage systems should be installed, fixed, tested (e.g., for leaks), and how to safely contain thermal movement in pipes. It also provides guidance for long-term maintenance and operational use. | Contractors, installers, and building maintenance personnel. |
The BS EN 12056-1:2015 standard is crucial for ensuring the safety and efficiency of gravity drainage systems in buildings. Here are some reasons why:
This article explains:
You can access the official standard safely through legitimate channels. Many options fit different budgets and project sizes. Official Standards Bodies
BS EN 12056-1 is part of a five-part series that provides a comprehensive overview of internal plumbing:
This guide explains what the standard covers, why it matters, and how to access it legally. What is BS EN 12056-1? As part of a larger series, Part 1
That being said, here are a few websites that may offer a free PDF of BS EN 12056-1:2000:
Given the risks of unauthorized downloads, here are the legal and safe ways to obtain BS EN 12056-1:2000 (and the wider 12056 series).