Filon have produced a special Technical Datasheet to assist designers, specifiers and the roofing industry, to provide basic requirements for rooflight design to meet the April 2006 Part L2 Regulations covering new build, extensions and refurbishment for all non domestic buildings.

The new Regulations supersede the previous Part L 2002 Regulations. The 2006 Regulations make a fundemental change to the method of compliance. The old Regulations were based on thermal values of the fabric of the building. The new Regulations consider not only the fabric of the building but also the energy efficiency of all the internal services - boilers, artifcial lighting, etc. The thermal values and energy requirements are then converted into carbon dioxide (CO₂) emissions. To be compliant with the 2006 Regulations the building must achieve a certain perscribed level of savings over the 2002 Regulations.

To meet the new stringent Part L Regulations, which are due in April 2006, Filon Products are able to offer Rooflight options that provide building design flexibility, optimum light transmissions and appropriate U-Values, thereby satisfying all the requirements stated in the new regulations.

There have been two recently published documents by NARM (National Association of Rooflight Manufacturers), that have been prepared by its members, including Filon Products. Both of these documents are available from Filon Products on request.

This document sets out guidelines for the application of ACR[M]001:2000 'Test for Fragility of Roofing Assemblies' to in-plane GRP rooflights, along with recommended rooflight sheet weights for various applications, as agreed by NARM members who manufacture in-plane GRP rooflights.

The document gives minimum weights for non-fragility when new and for expected 25 year period, and removes any doubts regarding the correct rooflight weight to use for a specific application.

This document provides extensive information on Daylight Design, Rooflight construction and type, Legal requirements and many other topics on rooflights and their uses.

The document is essential reading for anyone interested in the many rooflights options available and how their use can provide many benefits for buildings and their occupants.

All heated buildings commencing construction or refurbishment from Arpil 2002 effected.

Regulations apply to the control and the U-value of Rooflights.
The Standard Specification is :

Standard Design calls for 20% rooflights at a U-value of 2.2W/m²K.
This can be achieved with :