BR_PDF_AD_B2_2013.pdf - ONLINE VERSION The Building...

This preview shows page 1 out of 172 pages.

Unformatted text preview: ONLINE VERSION The Building Regulations 2010 Fire safety APPROVED DOCUMENT VOLUME 2 – BUILDINGS OTHER THAN DWELLINGHOUSES B1 B2 B3 B4 B5 B Means of warning and escape Internal fire spread (linings) Internal fire spread (structure) External fire spread Access and facilities for the fire service ONLINE VERSION in For use in England* 20 06 ed iti co 20 rp am 10 ora en an tin dm d 2 g 2 en 01 00 ts 3 7, on Came into effect April 2007 Main Changes ONLINE VERSION ii. BB100 should be used for the design of schools. B1 Volume 2 Main changes made by the 2013 amendments The general guidance on materials and workmanship and the Construction Products Directive has been edited and a reference to Approved Document 7 put in its place. Table 10 (Classification of linings) has been changed in relation to wallcoverings which conform to BS EN 15102:2007 Decorative wallcoverings – roll and panel form products. Table 11 (Limitations applied to thermoplastic rooflights and lighting diffusers in suspended ceilings and Class 3 plastic rooflights) has been changed to incorporate more flexible guidance for small diffusers and rooflights. Appendix A (Performance of materials, products and structures) includes new guidance on the standard substrates set out in BS EN 13238 Reaction to fire tests for building products – conditioning procedures and general rules for the selection of standard substrates. Main changes made by the 2010 amendments The amendment in March 2010 updated a number of references to European Standards. In particular, the guidance in Appendix B (Fire doors) was updated to take account of BS EN 81-58:2003 Safety rules for the construction and installation of lifts – Examination and tests. Landing doors fire resistance test. The amendment in October 2010 reflected the changes made as a result of the Building Regulations 2010, Building Approved Inspector etc. Regulations 2010. The changes mainly reflected regulation number changes as a result of re-ordering. Main changes in the 2006 edition This is the second impression of the 2006 Edition of Approved Document B which incorporates the typographical and proofing corrections issued in April 2007. This edition of Approved Document B, Fire safety, replaces the 2000 edition. The main changes are: General a. Approved Document B: The Approved Document has been split into two volumes. Volume 1 deals with dwellinghouses, Volume 2 deals with buildings other than dwellinghouses. b. Fire Safety Information: A new Regulation 38 has been introduced to ensure that sufficient information is recorded to assist the eventual owner/occupier/ employer to meet their statutory duties under the Regulatory Reform (Fire Safety) Order 2005. Introduction g. Fire Alarms in Flats: The guidance on smoke alarms in flats has been amended such that alarms should be installed in accordance with BS 5839-6:2004. Simple guidance has been retained, in the form of a commentary on this standard, so that most users of the Approved Document will necessarily not need to obtain a copy of the standard. i. All smoke alarms should have a standby power supply. h. Fire Alarms: The guidance for buildings other than dwellings has been updated to take account of the 2002 edition of BS 5839-1. i. Means of Escape: i. Locks and child resistant safety stays may be provided on escape windows. ii. New guidance has been provided on the provision of galleries and inner inner rooms. iii. Additional options of providing sprinkler protection and/or a protected stairway instead of alternative escape routes has been included for flats with more than one storey. iv. Guidance on the use of air circulation systems in flats with protected entrance halls or stairways is given. v. The provisions for smoke control in the common areas of flats have been changed. vi. Guidance on means of escape in buildings with open spatial planning has been included. vii. A method has been provided for calculating acceptable final exit widths for merging escape routes at ground floor level. viii. Guidance on the provision of cavity barriers associated with subdivided corridors has been moved to Section 3 and clarified. ix. Guidance applicable to small premises, previously in BS 5588-11, has been incorporated into the text. x. New guidance on the design of residential care homes has been given including the use of sprinklers and/or free swing door closing devices. Greater flexibility is also given where sprinkler systems are provided. xi. Guidance on means of escape for disabled people has been incorporated in the general guidance on means of escape. xii. In tall building with phased evacuation consideration needs to be given to the interaction of firefighters with people attempting to evacuate the building. xiii. More detailed guidance has been provided on the protection of ventilation systems. B3 Compartment Walls: The predicted deflection of a floor, in the event of a fire, should be accommodated in the design of compartment walls. k. Sprinkler Protection in Flats: Sprinkler systems should be provided in blocks of flats exceeding 30m in height. l. Warehouses: A maximum compartment size has been introduced for unsprinklered singlestorey warehouse buildings. m. Concealed Spaces: This section has been completely restructured. Table 13 (AD B 2000) has now been incorporated into the text to reduce confusion. j. c. Management of Premises: New guidance is given on the need to ensure that management regimes are realistic. d. Certification Schemes: Suitable schemes may be accepted by Building Control Bodies as evidence of compliance. e. Residential Sprinklers: The use of sprinkler systems in accordance with BS 9251:2005 is recognised. f. Alternative Approaches i. HTM 05 “Firecode” should be used for used for the design of hospitals and similar health care premises. Main changes are continued on the inside back cover * This approved document gives guidance for compliance with the Building Regulations for building work carried out in England. It also applies to building work carried out on excepted energy buildings in Wales as defined in the Welsh Ministers (Transfer of Functions) (No. 2) Order 2009. ONLINE VERSION ONLINE VERSION Contents B PAGE PAGE Use of guidance 5 B1 Section 4: Design for vertical escape 43 The Approved Documents 5 Introduction 43 Limitation on requirements 5 Number of escape stairs 43 Materials and workmanship 5 Provision of refuges 43 Interaction with other legislation 6 Width of escape stairs 45 Calculation of minimum stair width 45 Protection of escape stairs 49 Basement stairs 51 External escape stairs 52 General introduction 8 Scope 8 Arrangement of sections 8 Management of premises 9 Property protection 9 B1 Section 5: General provisions 53 Independent schemes of certification and accreditation 9 Introduction 53 Sprinkler systems 10 Inclusive design 11 Material alteration 11 Alternative approaches 11 B1 Means of warning and escape – The Requirement 14 B1 Guidance 15 Performance 15 Introduction 15 Protection of escape routes 53 Doors on escape routes 53 Stairs 54 General 57 Lifts 58 Mechanical ventilation and air-conditioning systems 59 Refuse chutes and storage 59 Shop store rooms 60 B2 Internal fire spread (linings) – The Requirement 61 B1 Section 1: Fire alarm and fire detection systems 17 B2 Guidance 62 Introduction 17 Performance 62 Flats 17 Introduction 62 Buildings other than flats B2 Section 6: Wall and ceiling linings 63 18 B1 Section 2: Means of escape from flats 21 Classification of linings 63 Introduction 21 Variations and special provisions 63 General provisions 21 Thermoplastic materials 64 Provisions for escape from flats where the floor is not more than 4.5m above ground level 22 Provisions for flats with a floor more than 4.5m above ground level B3 Internal fire spread (structure) – The Requirement 67 22 B3 Guidance 68 Means of escape in the common parts of flats 25 Performance 68 Common stairs 29 Introduction 68 Live/work units 31 B3 Section 7: Loadbearing elements of structure 69 B1 Section 3: Design for horizontal escape in buildings other than flats 32 Introduction 69 Introduction 32 Fire resistance standard 69 Escape route design 32 Raised storage areas 69 Small premises 39 Conversion to flats 70 Residential care homes 41 Approved Document B (Fire safety) Volume 2 – Buildings other than dwellinghouses 1 ONLINE VERSION B CONTENTS ONLINE VERSION PAGE PAGE B3 Section 8: Compartmentation 71 B4 Section 14: Roof coverings 102 Introduction 71 Introduction 102 Provision of compartmentation 71 Classification of performance 102 Construction of compartment walls and compartment floors 74 Separation distances 102 Openings in compartmentation 76 Protected shafts 76 B5 Access and facilities for the Fire and Rescue Service – The Requirement 105 B3 Section 9: Concealed spaces (cavities) 80 B5 Guidance 106 Introduction 80 Performance 106 Provision of cavity barriers 80 Introduction 106 Pathways around fire separating elements 81 Extensive cavities 81 B5 Section 15: Fire Mains and hydrants 107 Construction and fixings for cavity barriers 84 B3 Section 10: Protection of openings and fire-stopping 85 Introduction 85 Openings for pipes 85 Ventilation ducts, flues, etc. 86 Fire-stopping 87 B3 Section 11: Special provisions for car parks and shopping complexes 89 lntroduction 89 Car parks 89 Shopping complexes 90 B4 External fire spread – The Requirement 91 B4 Guidance 92 Performance 92 Introduction 92 B4 Section 12: Construction of external walls 93 Introduction 93 Fire resistance standard 93 Portal frames 93 External wall construction 93 External surfaces 93 B4 Section 13: Space separation 96 Introduction 96 Boundaries 97 Unprotected areas and fire resistance Methods for calculating acceptable unprotected area Volume 2 – Buildings other than dwellinghouses 2 98 100 Introduction 107 Provision of fire mains 107 Number and location of fire mains 107 Design and construction of fire mains 107 Provision of private hydrants 107 B5 Section 16: Vehicle access 108 Introduction 108 Buildings not fitted with fire mains 108 Buildings fitted with fire mains 111 Design of access routes and hard-standings 111 B5 Section 17: Access to buildings for firefighting personnel 112 Introduction 112 Provision of firefighting shafts 112 Number and location of firefighting shafts 112 Design and construction of firefighting shafts 112 Rolling shutters in compartment walls 114 B5 Section 18: Venting of heat and smoke from basements 115 Introduction 115 Provision of smoke outlets 115 Construction of outlet ducts or shafts 116 Basement car parks 116 Appendices Appendix A: Performance of materials, products and structures 117 Introduction 117 Fire resistance 117 Roofs 118 Reaction to fire 119 Non-combustible materials 119 Approved Document B (Fire safety) ONLINE VERSION CONTENTS ONLINE VERSION PAGE Materials of limited combustibility 119 Internal linings 119 Thermoplastic materials 120 Fire test methods 121 Appendix B: Fire doors 132 Appendix C: Methods of measurement 135 Appendix D: Purpose groups 139 Appendix E: Definitions 141 Appendix F: Fire behaviour of insulating core panels used for internal structures 145 Appendix G: Fire safety information 147 Appendix H: Standards and other publications referred to 149 Diagrams B1 1. Gallery floors with no alternative exit 22 2. Flat where all habitable rooms have direct access to an entrance hall 23 3. Flat with restricted travel distance from furthest point to entrance 23 4. Flat with an alternative exit, but where all habitable rooms have no direct access to an entrance hall 24 Multi-storey flat with alternative exits from each habitable room, except at entrance level 24 6. Multi-storey flat with protected entrance hall and landing 25 7. Flats served by one common stair 26 8. Flats served by more than one common stair 27 9. Common escape route in small single stair building 28 10. B PAGE 19. Progressive horizontal evacuation in care homes 41 20. Refuge formed by compartmentation 44 21. Refuge formed in a stairway 44 22. Maximum travel distance in a two-storey premises with a single open stair 50 23. Maximum travel distance in a small three-storey premises with a single stair to each storey 50 24. External protection to protected stairways 55 25. Fire resistance of areas adjacent to external stairs 56 26. Lighting diffuser in relation to ceiling 64 27. Layout restrictions on Class 3 plastic rooflights, TP(b) rooflights and TP(b) lighting diffusers 65 27A. Layout restrictions on small Class 3 plastic rooflights, TP(b) rooflights and lighting diffusers 66 B2 B3 28. Compartment floors: illustration of guidance in paragraph 8.18 73 29. Compartment walls and compartment floors with reference to relevant paragraphs in Section 8 75 30. Junction of compartment wall with roof 77 31. Protected shafts 32. Uninsulated glazed screen separating protected shaft from lobby or corridor 79 33. Provisions for cavity barriers 80 34. Cavity walls excluded from provisions for cavity barriers 82 35. Fire-resisting ceiling below concealed space 83 36. Provisions for cavity barriers in double-skinned insulated roof sheeting 83 Travel distance in dead-end condition 34 37. Pipes penetrating structure 86 11. Alternative escape routes 34 38. 12. Inner room and access room 35 Enclosure for drainage or water supply pipes 87 13. Exits in a central core 35 39. 14. Open connections 35 Flues penetrating compartment walls or floors 88 15. Merging flows at final exit 37 16. Subdivision of corridors 38 17. Dead-end corridors 39 18. Maximum travel distances in a small two or three storey premises with a single protected stairway to each storey 40 5. Approved Document B (Fire safety) 78 B4 40. Provisions for external surfaces or walls 95 41. Relevant boundary 96 42. Notional boundary 97 43. Status of combustible surface material as unprotected area 98 Volume 2 – Buildings other than dwellinghouses 3 ONLINE VERSION B CONTENTS ONLINE VERSION PAGE 44. Unprotected areas which may be disregarded in assessing the separation distance from the boundary 99 45. The effect of a canopy on separation distance 46. Permitted unprotected areas in small residential buildings 101 47. Limitations on spacing and size of plastic rooflights having a Class 3 (National class) or Class D-s3, d2 (European class) or TP(b) lower surface 102 B2 10. Classification of linings 63 11. Limitations applied to thermoplastic rooflights and lighting diffusers in suspended ceilings and Class 3 plastic rooflights 65 99 B5 48. Example of building footprint and perimeter 109 49. Relationship between building and hard-standing/access roads for high reach fire appliances 110 50. Turning facilities 111 51. Provision of firefighting shafts 113 52. Components of a firefighting shaft 114 53. Fire-resisting construction for smoke outlet shafts 115 Appendices C1. Measurement of door width 136 C2. Cubic capacity 136 C3. Area PAGE 137 C4. Height of building 137 C5. Number of storeys 138 C6. Height of top storey in building 138 C7. Free area of smoke ventilators 138 E1. Recessed car parking areas 144 Tables B1 B3 12. Maximum dimensions of building or compartment (non-residential buildings) 74 13. Maximum dimensions of cavities in non-domestic buildings (Purpose Groups 2-7) 14. 82 Maximum nominal internal diameter of pipes passing through a compartment wall/floor 85 B4 15. Permitted unprotected areas in small buildings or compartments 101 16. Limitations on roof coverings 103 17. Class 3 (National class) or Class D-s3,d2 plastic rooflights: limitations on use and boundary distance 104 18. TP(a) and TP(b) plastic rooflights: limitations on useand boundary distance 104 B5 19. Fire and rescue service vehicle access to buildings (excluding blocks of flats) not fitted with fire mains 108 20. Typical fire and rescue service vehicle access route specification 111 Appendices A1. Specific provisions of test for fire resistance of elements of structure etc. 122 A2. Minimum periods of fire resistance 124 A3. Limitations on fire-protecting suspended ceilings 126 A4. Limitations on the use of uninsulated glazed elements on escape routes 127 A5. Notional designations of roof coverings 128 A6. Use and definitions of non-combustible materials 129 A7. Use and definitions of materials of limited combustibility 130 A8. Typical performance ratings of some generic materials and products 131 B1. Provisions for fire doors 134 1. Limitations on distance of travel in common areas of block of flats 28 2. Limitations on travel distance 33 3. Minimum number of escape routes and exits from a room, tier or storey 34 4. Widths of escape routes and exits 36 5. Maximum distances of travel in small premises with a protected stair 40 6. Minimum widths of escape stairs 45 7. Capacity of a stair for basements and for simultaneous evacuation of the building 46 8. Minimum width of stairs designed for phased evacuation 48 C1. Floor space factors 135 9. Provisions for escape lighting 58 D1. Classification of purpose groups 140 Volume 2 – Buildings other than dwellinghouses 4 Approved Document B (Fire safety) ONLINE VERSION ONLINE VERSION Use of guidance B THE APPROVED DOCUMENTS MATERIALS AND WORKMANSHIP This document is one of a series that has been approved and issued by the Secretary of State for the purpose of providing practical guidance with respect to the requirements of Schedule 1 to and Regulation 7 of the Building Regulations 2010 (SI 2000/2214) for England and Wales. Any building work which is subject to the requirements imposed by schedule 1 to the Building Regulations shall be carried out in accordance with regulation 7. Guidance on meeting these requirements on materials and workmanship is contained in the Approved Document to support regulation 7. At the back of this document is a list of all the documents that have been approved and issued by the Secretary of State for this purpose. The Approved Documents are intended to provide guidance for some of the more common building situations. However, there may well be alternative ways of achieving compliance with the requirements. Thus there is no obligation to adopt any particular solution contained in an Approved Document if you prefer to meet the relevant requirement in some other way. Other requirements The guidance contained in an Approved Document relates only to the particular requirements of the Regulations which that document addresses. The building work will also have to comply with the Requirements of any other relevant paragraphs in Schedule 1 to the Regulations. There are Approved Documents which give guidance on each of the other requirements in Schedule 1 and on Regulation 7. LIMITATION ON REQUIREMENTS In accordance with Regulation 8, the requirements in Parts A to D, F to K, N and P (except for paragraphs H2 and J7) of Schedule 1 to the Building Regulations do not require anything to be done except for the purpose of securing reasonable standards of health and safety for persons in or about buildings (and any others who may be affected by buildings or matters connected with buildings). This is one of the categories of purpose for which Building Regulations may be made. Paragraphs H2 and J7 are excluded from Regulation 8 because they deal directly with prevention of the contamination of water. Parts E and M (which deal, respectively, with resistance to the passage of sound and access to and use of buildings) are excluded from Regulation 8 because they address the welfare and convenience of building users. Part L is excluded from Regulation 8 because it addresses the conservation of fuel and power. All these matters are amongst the purposes other than health and safety that may be addressed by Building Regulations. Approved Document B (Fire safety) Building Regulations are made for specific purposes, primarily the health and safety, welfare and convenience of people and for energy conservation. Standards and other technical specifications may provide relevant guidance to the extent that t...
View Full Document

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture