The National Association of Rooflight Manufacturers (NARM) have issued a 2nd tier document to ADL2A 2010 to advise full details for designers and contractors on achieving compliance to Part L by using rooflights and artificial lighting control. 

It provides advice on the use of SBEM and how to input rooflight data, the effect of varying rooflight area, thermal and light transmission properties, worst case U-values and solar gain limits, as well as looking at the requirements for refurbishment detailed in AD L2B.

The document “Designing with Rooflights – supporting the guidance in ADL2A &ADL2B (2010) “ can be downloaded from the NARM website