U-values you can TRUST
Honest U-values backed
up by evidence
Our U-values values are calculated to the EN14351 and BRFC standards, to give anyone choosing Sheerline aluminium products complete confidence. We present below the independently verified reports which back up these claims.
Independently verified U-value reports
Prestige Casement Window
Large Outer Frame 28mm DG
2 Pane Prestige Lift & Slide Patio
Slim Interlock, Frame Threshold 28mm DG
2 Pane Prestige Lift & Slide Patio
Slim Interlock, Frame Threshold 44mm TG
2 Pane Prestige Lift & Slide Patio
Slim Interlock, Low Threshold 36mm TG
2 Pane Prestige Lift & Slide Patio
Slim Interlock, Low Threshold 44mm TG
3 Pane Prestige Lift & Slide Patio
Frame Threshold 44mm TG
Prestige 3/2/1 Bi-fold
Integral Cill 28mm DG
Prestige 3/3/0 Bi-fold
Frame Threshold 28mm DG
Prestige Casement Window
Intermediate Outer Frame 28mm DG
Prestige French Door
Large Outer Frame, Frame Threshold 28mm DG
Prestige French Door
Large Outer Frame, Low Threshold 28mm DG
Prestige Residential Door
Midrail and Large Outer Frame, Low Threshold 28mm DG
Prestige Residential Door
Midrail and Frame Threshold 28mm DG
Prestige Tilt & Turn Window
Large Outer Frame 28mm DG
Not all systems are made equal - it pays to check
When you are comparing aluminium systems, you will encounter claimed U-values that aren’t backed up by independent verification, and that frankly we would be sceptical of.
Please make sure you ask for evidence, whoever’s windows and doors you choose – and make sure the products supplied are made to the same specification as the reports you are shown.
We know this will become increasingly important in the future as the government has ambitious sustainability targets that form part of the Net Zero Strategy. It’s important to ensure your home is well insulated both for your comfort and to help keep heating bills low.
Independently audited
Made in Britain
Made in Britain recognises excellence in manufacturing and promotes British-made products across all sectors. Giving businesses and consumers confidence and clarity that they are buying British.
Quality Management System
The Sheerline manufacturing site has achieved ISO9001: 2015 accreditation, meeting British standards for a robust, quality management system.
ALFED
Sheerline is proud to be a member of The Aluminium Federation, which represents businesses who process, trade and work with aluminium, promoting best practise within the sector.
Powered by Thermlock®
Thermlock® the multi-chambered technology that sits at the heart of all our products, means we achieve high-performance U-values across all our products. It helps keep homes warm in the colder months and heating bills lower.
Our reputation is built on trust
Contact us for more information, or to explore the right high performance aluminium Sheerline products for your project