Environmental and health related criteria for buildings - ANEC

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IBO - Environmental and Health related Criteria for Buildings - All living rooms, dining rooms and studies (including any room designated as a home office) must achieve a minimum average daylight factor of at least 1.5% (1 point). - 80% of the working plane in each kitchen, living room, dining room and study (including any room designated as a home office) must receive direct light from the sky (1 point). Evidence must be provided by daylighting calculations and plans showing the angle of visible sky, room dimensions, position and size of windows, external buildings and other obstructions, the position of the no-sky line 62 in the room and percentage of area of the working plane 63 that receives direct light from the sky. It is acceptable that daylighting calculations are carried out in selected dwellings when the reasoning behind selection of dwellings (or rooms) clearly demonstrates that the rooms in the dwellings for which the calculations are not provided will perform better than those backed up by the calculations. The average daylight factor is defined as the average indoor illuminance (from daylight) on the working plane within a room, expressed as a percentage of the simultaneous outdoor illuminance on a horizontal plane under an unobstructed CIE Standard Overcast Sky. The Code awards credits for meeting the minimum average daylight factor suggested by BS 8206-2. Calculations of the average daylight factor may use the following formula (method described in Littlefair (1998) as set out in BS 8206–2) 64 or computer simulation or scale model measurements for more complex rooms and external obstructions. DF = M·W·T·θ / (A (1-R²)) Where: M = a correction factor for dirt W = total glazed area of windows or roof lights T = glass transmission factor A = total area of all the room surfaces (ceiling, floor, walls and windows) R = area-weighted average reflectance of the room surfaces θT = angle of visible sky The average daylight factor formula can be used to model daylighting conditions in any simple rectangular room with a continuous external obstruction or none. Where external obstructions are of complex geometry and cannot be approximated by a continuous object, it is advised to use methodology in Littlefair (1998). More complex room geometries can be modelled using computer simulation software, physical scale modelling or advanced manual calculations For construction stage, an inspection report confirming the input data for calculations or onsite measurements in the same rooms assessed during design stage is required. 62 The no-sky line divides those areas of the working plane which can receive direct light from the sky, from those which cannot. It is important as it indicates how good the distribution of daylight is in a room. Areas beyond the no-sky line will generally look gloomy. 63 The working plane is a notional surface, typically at about desk or table height, at which daylight factor or the ‘no-sky line’ is calculated or plotted. For the calculations required here, it is at 0.85m above the fl oor. 64 Littlefair, P. J., Site layout planning for daylight and sunlight, A guide to good practice”, BRE Press, 1998. BS 8206 “Lighting for buildings - Code of practice for daylighting Part 2”, 1992. Information Paper IP 23/93 “Measuring daylight”, BRE, 1993. Final Report 96 31 03 2011
IBO - Environmental and Health related Criteria for Buildings 9.5. BREEAM Multiresidential 2008 Source: BREEAM Multi-residential 2008 Assessor Manual (BREEAM BRE Environmental & Sustainability Standard BES 5064: Issue 1.0; ed. © BRE Global, 2008, http://www.breeam.org) BREEAM Multi-residential scheme is intended for use on multi-occupancy residential buildings which are not suitable for assessment under the Code for Sustainable Homes (CSH) or EcoHomes (e.g. student halls of residence; key worker accommodation, sheltered housing, etc.) Daylighting and lighting relevant comfort criteria are assessed within subsection Health & Wellbeing (HEA) including the following issues: - Hea1 Daylighting - Hea2 View out - Hea3 Glare control - Hea4 High Frequency Lighting - Hea5 Internal and external lighting levels Hea1 Daylighting The requirements to be met are differentiated into requirements for residential and communal areas: Adequate daylighting for residential areas is defined in full compliance with the requirements of CSH (Code for Sustainable Homes). At least 80% of floor area in each occupied space must be adequately daylit which means: a) In kitchen areas an average daylight factor of at least 2% must be achieved. b) All living rooms, dining rooms and studies (including any room designated as a home office) must achieve a minimum daylight factor of at least 1.5%. c) 80% of the working plane in each kitchen, living room, dining room and study (including any room designated as a home office) must receive direct light from the sky. For communal areas where people will be working and desk-based are likely undertaken the average daylight criterion of 2% is complemented by either calculations showing that a uniformity ratio of at least 0.4 or a minimum point daylight factor of at least 0.8% is achieved or a view of sky from desk height (0.7m) is achieved and the room depth criterion is satisfied taking into account room depth, room width, window head height from floor level and average reflectance of surfaces in the rear half of the room. Additionally, the provision of daylight must be designed in accordance with the guidance in CIBSE Lighting Guide 10 Daylighting and window design, BS8206 Part 2 and the BRE Site Layout Guide. Hea2 View out The following demonstrates compliance: 1. All living rooms (in self contained flats), communal lounges and individual bedrooms/bedsits in sheltered housing are within 5m distance of a wall with a window or Final Report 97 31 03 2011
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