Access to and use of buildings: Approved Document M

O N L I N E V E R S I O N M GENERAL GUIDANCE in light reflectance value between the two Utility stair, a stair used for escape, surfaces is greater than 30 points. Where access for maintenance, or purposes other illuminance on surfaces is greater than 200 than as a usual route for moving between lux, a difference in light reflectance value levels on a day-to-day basis. should be a minimum of 20 points. Where door opening furniture projects beyond the face of the door or otherwise creates enhanced differentiation and shade, a minimum difference in light reflectance value of 15 points is considered adequate. For further information, reference should be made to Colour, contrast and perception – Design guidance for internal built environments – Reading University. Dwelling, means a house or a flat (‘flat’ is defined in regulation 2(1)). However, new blocks of flats built as student accommodation are to be treated as though they are hotel/motel accommodation in respect of space requirements and internal facilities (see 4.17 to 4.24). General access stair, a stair intended for all users of a building on a day-to day- basis, as a normal route between levels. Illuminance, the amount of light falling on a surface, measured in lumens per square metre (lm/m2) or lux (lx). Level, with respect to the surfaces of a level approach, access routes and landings associated with steps, stairs and ramps means predominantly level, but with a maximum gradient along the direction of travel of 1:60. Light reflectance value (LRV), the total quantity of visible light reflected by a surface at all wavelengths and directions when illuminated by a light source. Principal entrance, the entrance which a visitor not familiar with the building would normally expect to approach. Suitable, with respect to means of access and facilities, means that they are designed for use by people regardless of disability, age or gender, but subject to the usual gender-related conventions regarding sanitary accommodation. Usable, with respect to buildings or parts of buildings, means that they are convenient for independent use. Approved Document M Volume 2 Access to and use of buildings other than dwellings O N L I N E V E R S I O N 15