Certificates & Standards

In order to protect us all from the old “cheap and nasty” adage there are numerous international, Europe and UK national standards and in many cases national regulations / requirements. The water and construction industries, and the products and services used therein are no different and compliance with applicable standards ensures that customers can be safe in the knowledge that money has been spent on products that comply and are approved to applicable standards.

To view or download our current certification scroll down or click here

“Put at its simplest, a standard is an agreed, repeatable way of doing something. It is a published document that contains a technical specification or other precise criteria designed to be used consistently as a rule, guideline, or definition. Standards help to make life simpler and to increase the reliability and the effectiveness of many goods and services we use. Standards are created by bringing together the experience and expertise of all interested parties such as the producers, sellers, buyers, users and regulators of a particular material, product, process or service.”

- Source BSI

Structured Wall Plastic Pipes

One such standard that has recently come to the fore, taking over from the incumbent WIS 4-35-01 is the European Standard BS EN 13476 - Plastics piping systems for nonpressure underground drainage and sewerage – structured wall piping systems of unplasticised poly vinyl chloride (PVC-U), polypropylene (PP) and polyethylene (PE).

This standard took many years to develop and involved most of Europe’s plastic pipe manufacturers to ensure commonality across the whole industry when it comes to ensuring the quality, reliability and longevity of the product. It has raised the bar for structured-wall plastic pipe system standards right across Europe. The standard was specifically written for structured wall pipe systems made only from one of three materials: HDPE, PP or PVC. As stated by the CEN committee (the European Committee for standardisation), it is not applicable to, and therefore cannot be used, as a standard for pipes made from other materials, combinations of materials (composite pipes) or pipe systems that do not belong to the clearly defined structured wall family.

Reassurance for installers, system operators and owners BS EN 13476 covers all aspects of the system for foul and surface water sewers, some of the main points that provide comfort and reassurance to the end users are raw materials, wall thicknesses, impact resistance, ring flexibility and structural design requirements.

Weholite Certification

You can see and download the full array of our achievements below which proves beyond any doubt that we care deeply about our standards. They are high.

Weholite is “Approved for use in public water supplies.” DWI Regulation 31 Reference number DWI

  • DWI 56.4.513a – Weholite Tanks (Pipes and Panels) which is in section B1.1 Polyethylene (PE) Pipes
  • DWI 56.4.513b – Weholite Tanks (Pipes and Panels) which is in section E.1. Tanks 



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