How to demonstrate compliance with Part L standards

How to demonstrate compliance with Part L standards

From 15th June 2022 new rules come into force aimed at improving the thermal and energy efficiency performance of our homes and commercial buildings. The changes are part of the government’s wider push to achieve zero-net carbon emissions by 2050 and will have an impact on those specifying, fabricating, and installing windows and door systems.

The updated regulations (to Part L of the Building Regulations) require that all windows or doors installed in new dwellings or buildings after June must have a U-value rating of 1.6 – a drop of 0.4 from the previous standard.

However, for those working on replacement and refurbishment projects there are two ways in which manufacturers are able to show that their products and systems comply - U-values or the BFRC window efficiency rating.

What is a U-value?

A U-Value is the measure of the overall rate of heat transfer through a particular section of construction – in this case windows and doors.

In other words, a U-value is used to measure how well or badly a component transmits heat from the inside to the outside. The slower or more difficult it is for heat to transfer through the component, the lower the U-value. This means that we are looking for a lower U-value. The lower the U-value the better.

BFRC window rating scheme (WER):

The BFRC is a subsidiary of the Glass and Glazing Federation. Its window rating scheme (WER) is based on a traffic light system and gives each window/door product a rating from A – G for energy efficiency. ‘A’ indicates a good level of energy efficiency with ‘G’ demonstrating the lowest. The label gives an overall indication of how energy efficient the window is, how much air it will allow to penetrate a building, likelihood of condensation and level of acoustic insulation. ‘I’ can also be used to demonstrate building regulations compliance for replacement windows.

Over the last year, Reynaers has rigorously benchmarked their current products and planned new products to ensure they comply with the required U-values. This involved a detailed FEA analysis using specific thermal modelling software to calculate the thermal performance, as well as carrying out additional analysis associated with the BFRC (British Fenestration Rating Council) which is a labelling system for window and doors products, to give Reynaers’ customers the utmost confidence in their purchasing decision.

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Reynaers Aluminium Ltd

Reynaers Aluminium Ltd

As one of the UK’s leading suppliers of innovative and sustainable architectural aluminium systems, Reynaers prides itself on delivering high-quality window, door and curtain walling systems for residential and commercial projects.

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