Document B2 - Fire Safety in Non-Dwellings from April 2007.pdf

(4838 KB) Pobierz
704421083 UNPDF
704421083.024.png 704421083.025.png
VOLUME 2
MAIN CHANGES IN THE
2006 EDITION
This edition of Approved Document B, Fire safety,
replaces the 2000 edition. The main changes are:
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 special 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.
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
(16B) 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
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.
ii. BB100 should be used for the design
of schools.
B3
j . 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 single-
storey 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.
i. Openings: Window and door frames should
only be regarded as cavity barriers if they
are constructed of steel or timber of an
appropriate thickness.
ii. Under Floor Voids: Extensive cavities in floor
voids should be subdivided with cavity barriers.
n . Fire dampers: Guidance on the specification and
installation of fire dampers has been provided.
o . Car Parks: Non combustible materials should
be used in the construction of a car park for it
to be regarded as ‘open sided’ for the purposes
of establishing the necessary period of fire
resistance. Other car parks should achieve
the standard period of fire resistance.
B1
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.
Main changes are continued on the inside back cover
 
B
Contents
PAGE
PAGE
Use of guidance
5
B1 Section 4: Design for vertical escape 44
Introduction
The Approved Documents
5
44
Limitation on requirements
5
Number of escape stairs
44
Materials and workmanship
5
Provision of refuges
44
Interaction with other legislation
6
Width of escape stairs
46
General introduction
9
Calculation of minimum stair width
46
Protection of escape stairs
50
Scope
9
Basement stairs
52
Arrangement of sections
9
External escape stairs
53
Management of premises
10
Independent schemes of certifi cation and
accreditation
B1 Section 5: General provisions
54
10
Introduction
54
Sprinkler systems
11
Protection of escape routes
54
Inclusive design
12
Doors on escape routes
54
Material alteration
12
Stairs
55
Alternative approaches
12
General
58
B1 Means of warning and escape
– The Requirement
Lifts
59
15
Mechanical ventilation and
air-conditioning systems
B1 Guidance
16
60
Refuse chutes and storage
60
Performance
16
Shop storerooms
61
Introduction
16
B1 Section 1: Fire alarm and fi re
detection systems
18
B2 Internal fi re spread (linings)
– The Requirement
62
Introduction
18
B2 Guidance
63
Flats
18
Performance
63
Buildings other than fl ats
19
Introduction
63
B1 Section 2: Means of escape from fl ats 22
Introduction
B2 Section 6: Wall and ceiling linings
64
22
Classifi cation of linings
64
General provisions
22
Variations and special provisions
64
Provisions for escape from fl ats where the fl oor
is not more than 4.5m above ground level
Thermoplastic materials
65
23
B3 Internal fi re spread (structure)
– The Requirement
Provisions for fl ats with a fl oor more
than 4.5m above ground level
23
67
Means of escape in the common
parts of fl ats
B3 Guidance
68
26
Performance
68
Common stairs
30
Introduction
68
Live/work units
32
B3 Section 7: Loadbearing elements
of structure
B1 Section 3: Design for horizontal escape
in buildings other than fl ats
69
33
Introduction
69
Introduction
33
Fire resistance standard
69
Escape route design
33
Raised storage areas
69
Small premises
40
Conversion to fl ats
70
Residential care homes
42
Approved Document B (Fire safety)
Volume 2 – Buildings other than dwellinghouses
1
704421083.026.png 704421083.001.png 704421083.002.png 704421083.003.png 704421083.004.png 704421083.005.png 704421083.006.png 704421083.007.png
B
CONTENTS
PAGE
PAGE
B3 Section 8: Compartmentation
71
B4 Section 14: Roof coverings
102
Introduction
71
Introduction
102
Provision of compartmentation
71
Classifi cation of performance
102
Construction of compartment walls and
compartment fl oors
Separation distances
102
74
B5 Access and facilities for
the Fire and Rescue Service
– The Requirement
Openings in compartmentation
76
Protected shafts
76
105
B3 Section 9: Concealed spaces (cavities) 80
Introduction 80
Provision of cavity barriers 80
Pathways around fi re separating elements 81
Extensive cavities 81
Construction and fi xings for cavity barriers 84
B5 Guidance
106
Performance
106
Introduction
106
B5 Section 15: Fire Mains and hydrants 107
Introduction
107
Provision of fi re mains
107
B3 Section 10: Protection of openings
and fi re-stopping
Number and location of fi re mains
107
85
Design and construction of fi re mains
107
Introduction
85
Provision of private hydrants
107
Openings for pipes
85
B5 Section 16: Vehicle access 108
Introduction 108
Buildings not fi tted with fi re mains 108
Buildings fi tted with fi re mains 111
Design of access routes and hard-standings 111
Ventilation ducts, fl ues, etc.
87
Fire-stopping
87
B3 Section 11: Special provisions for car
parks and shopping complexes
89
lntroduction
89
Car parks
89
B5 Section 17: Access to buildings for
fi refi ghting personnel 112
Introduction 112
Provision of fi refi ghting shafts 112
Number and location of fi refi ghting shafts 112
Design and construction of fi refi ghting shafts 112
Rolling shutters in compartment walls
Shopping complexes
90
B4 External fi re spread
– The Requirement
91
B4 Guidance
92
Performance
92
114
Introduction
92
B5 Section 18: Venting of heat and
smoke from basements
B4 Section 12: Construction of
external walls
115
93
Introduction
115
Introduction
93
Provision of smoke outlets
115
Fire resistance standard
93
Construction of outlet ducts or shafts
116
Portal frames
93
Basement car parks
116
External wall construction
93
Appendices
External surfaces
93
B4 Section 13: Space separation
96
Appendix A: Performance of
materials, products and structures
117
Introduction
96
Introduction
117
Boundaries
97
Fire resistance
117
Unprotected areas and fi re resistance
98
Roofs
118
Methods for calculating acceptable
unprotected area
100
Reaction to fi re
119
Non-combustible materials
119
Volume 2 – Buildings other than dwellinghouses
Approved Document B (Fire safety)
2
704421083.008.png 704421083.009.png 704421083.010.png 704421083.011.png 704421083.012.png 704421083.013.png 704421083.014.png 704421083.015.png
CONTENTS
B
PAGE
PAGE
Materials of limited combustibility
119
19. Progressive horizontal evacuation
in care homes 42
20. Refuge formed by compartmentation 45
21. Refuge formed in a stairway
Internal linings
119
Thermoplastic materials
120
45
Fire test methods
121
22. Maximum travel distance in a
two-storey premises with a single
open stair
Appendix B: Fire doors
132
51
Appendix C: Methods of measurement
135
23. Maximum travel distance in a
small three-storey premises with
a single stair to each storey
Appendix D: Purpose groups
139
51
Appendix E: Defi nitions
141
24. External protection to protected
stairways
56
Appendix F: Fire behaviour of insulating
core panels used for internal structures 145
25. Fire resistance of areas adjacent to
external stairs
57
Appendix G: Fire safety information
147
B2
26. Lighting diffuser in relation to ceiling 65
27. Layout restrictions on Class 3 plastic
roofl ights, TP(b) roofl ights and TP(b)
lighting diffusers
Appendix H: Standards and other
publications referred to
149
Diagrams
66
B1
1.
Gallery fl oors with no alternative exit 23
B3
28. Compartment fl oors: illustration of
guidance in paragraph 8.18
2.
Flat where all habitable rooms have
direct access to an entrance hall
73
24
29. Compartment walls and compartment
fl oors with reference to relevant
paragraphs in Section 8
3.
Flat with restricted travel distance
from furthest point to entrance
24
75
4.
Flat with an alternative exit, but
where all habitable rooms have no
direct access to an entrance hall
30. Junction of compartment wall
with roof
77
25
31. Protected shafts
78
5.
Multi-storey fl at with alternative exits
from each habitable room, except at
entrance level
32. Uninsulated glazed screen separating
protected shaft from lobby or corridor 79
33. Provisions for cavity barriers
25
80
6.
Multi-storey fl at with protected
entrance hall and landing
26
34. Cavity walls excluded from provisions
for cavity barriers
82
7.
Flats served by one common stair
27
35. Fire-resisting ceiling below
concealed space
8.
Flats served by more than one
common stair
28
83
36. Provisions for cavity barriers in
double-skinned insulated roof sheeting 83
37. Pipes penetrating structure
9. Common escape route in small single
stair building 29
10. Travel distance in dead-end condition 35
11. Alternative escape routes
86
35
38. Enclosure for drainage or water
supply pipes
87
12. Inner room and access room
36
39. Flues penetrating compartment
walls or fl oors
13. Exits in a central core
36
88
14. Open connections
36
B4
40. Provisions for external surfaces of walls 95
41. Relevant boundary
15. Merging fl ows at fi nal exit
38
16. Subdivision of corridors
39
96
17. Dead-end corridors
40
42. Notional boundary
97
18. Maximum travel distances in a small two
or three storey premises with a single
protected stairway to each storey
41
43. Status of combustible surface material
as unprotected area
98
Approved Document B (Fire safety)
Volume 2 – Buildings other than dwellinghouses
3
704421083.016.png 704421083.017.png 704421083.018.png 704421083.019.png 704421083.020.png 704421083.021.png 704421083.022.png 704421083.023.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin