CIBSE Guide A provides data which allows us to determine the appropriate design and rooflight area to provide recommended light levels for a given application.Typically, for general retail and manufacturing areas, 500 Lux is the recommended level. The graph above shows how rooflight areas will affect illumination levels. In this example for a single storey…Details
There seems to be a lot of confusion out in the marketplace on this issue at the moment – with manufacturers making different claims and a general lack of clarity arising from what appear to be misunderstandings about the role and application of CE marks. CE marking is simply the manufacturer’s declaration that the product…Details
Don’t specify ‘walk-on’ rooflights if you mean ‘non-fragile’. The two terms have VERY different meanings.
The growing popularity of ‘walk-on’ rooflights – very high specification glass structures designed to floor loadings and therefore unsuitable for most rooflighting applications – has led to confusion amongst specifiers who often refer to ‘walk-on’ specification, when in fact their requirement is simply for a non-fragile rooflight. In response to frequent occurrences of mis-specification, NARM,…Details
In a recent NARM member company survey, 78% of respondents said their level of business is affected by spurious claims by unscrupulous or misinformed roof light suppliers. Unjustifiable performance claims in terms of thermal performance appear to be the main cause for concern, with some companies making claims which are simply impossible when put under…Details
Rooflight manufacturers are right to publish and promote the U-values of their products and low U-values are indeed an important contributing factor to overall building energy efficiency. However, rooflight area is actually the more significant factor in achieving Part L compliance. Generally speaking the larger the roof light area, the greater the reduction in energy…Details
It’s never a good thing to generalise, but the answer it would appear, may be more “Yes” than “No” in the case of some key topics. NARM recently conducted a survey of member companies to identify misunderstandings, problem topics or weak spots in specifications that they have been asked to quote against. Our aim being…Details