Bs 8558 Pdf Official

As sustainability becomes mandatory in UK building codes (Part G of the Building Regulations), BS 8558 offers critical guidance on how to integrate reclaimed water (greywater/rainwater) without cross-contaminating the mains drinking water supply.

A: Yes, but for healthcare (HBN 00-10), you must use BS 8558 in conjunction with HTM 04-01 (Health Technical Memorandum). BS 8558 provides the base design; HTMs add clinical risk requirements.

When you open your official BS 8558 PDF, pay close attention to these clauses:

Unlike generic piping standards, BS 8558 specifies functional requirements for:

BS 8558 was first published in 2011, replacing BS 6700:2006. The 2015 edition (current at the time of this analysis) consolidates guidance on: bs 8558 pdf

Unlike the Water Regulations (which are legally enforceable), BS 8558 is a code of practice – compliance is not mandatory by law, but it is the primary reference for demonstrating “good practice” in case of a dispute or prosecution under the Water Supply (Water Fittings) Regulations.

One of the most critical sections of the standard deals with backflow prevention. BS 8558 provides guidance on fluid categories and the specific types of backflow prevention devices required for different applications (e.g., dental chairs, industrial equipment, and garden taps) to prevent contaminated water from siphoning back into the public supply.

BS 8558:2015 is the British Standard that provides essential guidance on the design, installation, and maintenance of domestic water services within buildings. It acts as a companion to the European standard BS EN 806, filling in the technical gaps specifically for the UK.  Core Purpose 

The standard ensures that water systems provide a safe, reliable supply of wholesome water. It covers everything from the point where water enters a property to the taps and appliances it serves. While BS EN 806 focuses on general European requirements, BS 8558 provides the specific "how-to" for UK-specific practices.  What the Guide Covers  As sustainability becomes mandatory in UK building codes

Design & Pipe Sizing: Detailed methods for calculating flow rates and sizing pipes to prevent pressure drops or excessive noise.

Installation & Alteration: Best practices for laying out pipework, including underground pipes within a building's boundary (which BS EN 806 excludes).

Storage Systems: Guidance on sizing hot water storage to meet demand without wasting energy or risking bacterial growth.

Testing & Maintenance: Procedures for pressure testing new installations and ongoing maintenance to prevent stagnation and leaks.  Key Technical Annexes  but for healthcare (HBN 00-10)

The document includes specific technical tools to help engineers and installers:  Annex A: Examples of pumped water systems.

Annex B: Calculations specifically for hot water storage capacity. Annex C: Formulas and charts for accurate pipe sizing.  Why It Matters for Safety  Following BS 8558 is critical for: 

Preventing Contamination: Ensuring backflow prevention and proper materials are used to keep drinking water safe.

Legionella Control: Maintaining correct temperature regimes (keeping cold water cold and hot water hot) to minimize the risk of Legionella bacteria.

Efficiency: Reducing water and heat wastage through better system design. 

You can find official copies or digital versions through engineering resources like Standards Supply or the BSI Shop.  BS 8558 PDF - Norm Library