Pure And Simple Solution To Part L

Senior’s PURe aluminium windows

Senior Architectural Systems is well placed to help its customers achieve the new lower U-value targets required by Approved Document Part L of the Building Regulations and the new Future Homes Standard.

This is thanks to its established thermally-efficient PURe aluminium window system.

PURe has the ability to achieve U-values as low as 0.71W/m2K when calculated as a commercial CEN Standard window. Not only does this exceed current regulations but also comfortably meets the expected U-value target of 0.8W/m2k, which is likely to come into effect in mid-2022 following publication of the new guidance towards the end of this year.

The construction of the UK patented system features a high performance expanded polyurethane (PUR) thermal barrier, which gives the PURe system its thermal performance.

As well as helping to prevent heat loss to reduce energy consumption, the PURe system also offers ‘cradle to cradle’ recyclability, with even the PUR thermal barrier able to be reused with no requirement for landfill.

The slim aluminium frame also makes it ideally suited for use in residential homes and to meet the new requirements of the pending Future Homes Standard. Set to be introduced in 2025, the new Future Homes Standard will require all new build homes to embrace low carbon heating and achieve high levels of energy-efficiency.


 “The construction of the PURe system and its current ability to meet future U-value targets puts it in a class of its own and as a system, it’s incredibly easy to maintain which makes it an ideal long-term investment.”

– James Keeling-Heane 

Sales director, Senior Architectural Systems


Future proof

“It was always our aim to create a ‘future-proof’ range of fenestration products to help minimise the impact of large regulatory changes, adds SAS' Keeling-Heane. "And we’re confident that our PURe aluminium window system will continue to not only meet, but exceed expectations.”

Picture: Senior’s PURe aluminium windows.


Article written by Cathryn Ellis
24th August 2021


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