Context 172 - June 2022

30 C O N T E X T 1 7 2 : J U N E 2 0 2 2 TONY GWYNNE New building regulations New building regulations for England andWales have come into force with the publication of new Approved Documents on ventilation, conservation of fuel and power, and overheating. Uplifting of the Building Regulations 2010 and supporting Approved Documents A separate system of building control applies in England, Scotland, Northern Ireland and Wales. These briefing notes will relate to changes due in England and Wales. Each has very similar requirements. This uplifting of the 2010 building regulations will be a steppingstone for major changes due in 2025 and future zero-carbon targets. England England implemented Approved Documents F, L, O and S on 15 June. Amended Approved Document F (ADF): Ventilation ADF has been amended and simplified into two separate documents (in line with the format of amended Approved Document L): Volume 1: Dwellings; and Volume 2: Buildings other than dwellings. Unlike the previous 2013 ADF, there is no separate compliance guide but a new Home Users Guide will be available online. Only those changes and contents considered of interest to IHBC members have been included here. For a full update of changes and contents, read the relevant Approved Document, available free of charge at Volume 1: Dwellings Section 0: Introduction Exemptions This shortened version, compared to the 2013 edition, now refers readers to paragraphs A7 to A13 of the Manual to the Building Regulations. Historic and traditional buildings A shortened and amended version compared to the previous 2013 edition, as follows: Full extract from the AD: 0.5Work to the following types of dwellings may not need to comply fully with the ventilation standards in this approved document. a.Those listed in accordance with Section 1 of the Planning (Listed Buildings and Conservation Areas) Act 1990. b.Those in a conservation area designated in accordance with Section 69 of the Planning (Listed Buildings and Conservation Areas) Act 1990. c. Other historic buildings with a vapour-permeable construction that both absorbs moisture and readily allows moisture to evaporate.These include those built with wattle and daub, cob or stone, and constructions using lime render or mortar. 0.6Work to a building in paragraph 0.5 should comply with the ventilation standards in this approved document where reasonably practicable. The work should not result in either of the following outcomes. a. Unacceptably affect the significance of the listed building, conservation area or scheduled monument. b. Increase the risk of long-term deterioration of the building fabric or fittings. 0.7 New extensions to historic and traditional dwellings should comply with all ventilation standards in this approved document unless there is a need to match the external appearance or character of the extension to that of the host building. 0.8 The local authority’s conservation officer should be consulted when undertaking work to a building in paragraphs 0.5a or 0.5b. Intentions of requirement F1 There is now a list of intentions contained in the AD, briefly as follows: • To extract water vapour and indoor air pollutants from areas where they are produced in significant quantities (including kitchens, utility rooms and bathrooms) before they spread through the building. • To supply a minimum level of outdoor air for occupants’ health, following the guidance for whole-dwelling ventilation. • To provide rapid dilution of indoor air pollutants, and disperse water vapour, when necessary, in habitable rooms, following the guidance for purge ventilation. • Minimise the entry of external air pollutants (such as carbon dioxide). • Ventilation systems should achieve all of the following, as far as is reasonably practicable: low levels of noise; easy access for maintenance; and protection from cold draughts. Section 1:Ventilation provision Contains ventilation provision and system specific guidance on three types of ventilation system. (Opposite) Part of a public mural tribute for the victims of the Grenfell Tower fire disaster. The tragedy has led to tighter building regulations for high buildings. (Photo: Chiral Jon, Wikimedia)