Independent hot box testing is one of the keys to proving performance and hence compliance.

Xtralite are concerned over the accuracy of U values claimed for building components – particularly rooflights – and the impact that this may have on the long-term energy efficiency of our buildings.  Xtralite believes that
U-values submitted for Building Regulation approval must reflect those that will actually be found on site and has sought expert advice on how to achieve this goal.

To help specifiers and specifically Building Control Officers apply the Regulations effectively Xtralite have produced a Technical Bulletin seeks to explain the complexities of this situation. It also includes a review of important work commissioned by NARM from De Montfort University on the lighting energy savings available with rooflights.

To download a PDF version of the Technical Bulletin click the icon.
If you would prefer a printed version of the Technical Bulletin please
click here and complete the enquiry form.

Xtralite

Xtralite delivers professionalism, expertise and innovation to specifiers, installers and users of rooflights. It is the largest producer of rooflights in the UK gaining BBA accreditation and ISO 9001:2000 for design and manufacture.

We offer a comprehensive design and consultancy service to architects and specifiers on both standard and specialist rooflight specification (standard rooflight details are included on the NBS system). Xtralite is an active member of the National Association of Rooflight Manufacturers (NARM) and is leading the industry drive toward sustainability