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U-Values & Energy Ratings

U-value calculations (sometimes referred to as heat transfer coefficients or thermal transmittances) are used to measure how effective the components of a building’s fabric are as insulators i.e. preventing heat from transmitting between the inside and the outside of a building.


As energy prices continue to soar and the awareness of sustainable buildings continues to grow, performance measures such as u-values are becoming increasingly important. Compliance with building regulations requires lower than ever u-value performance, which means changes in the design of buildings, both in the use of materials (e.g. insulation), the make up of the building elements (e.g. cavity walls and double glazing) and the overall make up of a building’s fabric (e.g. reducing the proportion of glazing).

UKTC undertake u-value calculations for windows and doors to meet the requirements of the building regulations, Part L. Our engineering team can also help to design a cost-effective research and development programme to help you maximise the performance of your windows and door products to your specific requirements.


BS EN 673-2011

▪ BS EN ISO 6946:2017

▪ BS EN ISO 10077-1:2017

▪ BS EN ISO 10077-2:2017

▪ BS EN ISO 10456-2007

▪ BS EN 14351-1:2016 + A2:2016

  • How much does a fire resistance test cost?
    Full-scale Fire Resistance tests are available from £7,800 plus VAT. However, every test is unique, and fees can vary based on the scope of work involved. During contract review, UKTC personnel will work collaboratively with customers to ensure that the broadest field of application is achieved whilst minimising investment.
  • How long does it take to get results?
    On completion of the test, the responsible officer will confirm the results within 24 hrs. This will be followed by a comprehensive draft report within 14 days.
  • Can my product be changed from what was tested?
    Unlike fire resistance tests under British Standards, European standards provide a Direct Field of Application (DIAP) which detail the permissible changes from what was tested. An Extended Field of Application (EXAP) can also be undertaken which offers a great scope of variations than a DIAP.
  • What is third-party certification?
    Third-party certification is independent verification that a product or service fulfils certain criteria. With passive fire protection products, this normally involves a certification body assessing test results, carrying out a factory production control audit and undertaking periodic inspections to ensure constancy of performance. UKTC work with many approved certification providers, including Bluesky Certification, IFC Certification and UL Solutions.
  • What is UKCA Marking?
    UK Conformity Assessed (UKCA) marking is the new product marking which will be required for certain products placed on the market in Great Britain (England, Wales and Scotland).
  • Does my product require UKCA Marking?
    The Construction Products Regulation in Great Britain states that any Construction Product covered by a UK Designated Standard must be UKCA marked.

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