Daylighting is the practice of installing windows, or other openings such as rooflights, and reflective surfaces within buildings to allow natural light to enter and spread through rooms and internal spaces.
The amount of daylight building occupants have access to has an impact on their health and wellbeing, and so, has become an important consideration in building design.
There are several design considerations for daylighting provision, including:
• window size, quantity and layout;
• room layout and depth;
• internal finishes, such as reflective surfaces and interior decoration; and
• positioning of exterior obstructions, such as other buildings or trees.
Research from leading building consultants, Peutz B.V., has revealed that by using higher performing insulation within rainscreen and cavity walls, it is possible to reduce construction thicknesses and achieve noticeable improvements in internal natural light levels.
The analysis looks at the change in the average daylight factor (ADF) for a room when premium performance Kingspan Kooltherm insulation is used compared with mineral fibre insulation. For each scenario, comparative constructions were designed to achieve an identical U-value. This required a greater insulation thickness, and consequently wall and reveal depths, for the lower performing mineral fibre insulation constructions. A number of window arrangements were also considered for each scenario.
Daylighting design criteria, such as those outlined in BS 8206-2: 2008 (Lighting for buildings. Code of practice for daylighting), can contribute towards the award of two credits within section Hea 01 of the latest BREEAM assessments.
Kingspan Kooltherm offers a thin insulation solution to meet or exceed daylighting requirements set out in BS 8206-2: 2008, and offers a way to achieve BREEAM visual comfort daylighting credits, by keeping window reveal depths to a minimum to allow entry of more natural light into buildings whilst also achieving or exceeding thermal requirements.
For more information, download the white paper below.