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Tony Gwynne, a Building Control Surveyor, working for a District Council; 20 years experience at a senior level in local authority building control.
About the Author xi
Acknowledgements xiii
Notes to the Reader xv
Expected Changes to the Building Regulations to Come into Force in 2013 xvii
Section 1 General information 1.1
Introduction 1.3
The Building Act 1984 and the Building Regulations 2010 1.3
Approved Documents 1.4
Other ways of satisfying the Building Regulations requirements 1.5
Technical and condensation risks 1.5
Timber-sizing tables independently calculated by GEOMEX for solid timber members 1.6
Engaging a property professional 1.6
Obtaining Building Regulations approval 1.7
Notices of stages of works 1.9
Exempt buildings and work 1.9
Preliminary works 1.11
Matters related to the Building Regulations 1.14
The Party Wall Act 1996 1.15
Rights of Light 1.17
Section 2 Domestic extensions 2.1
Part A: Structure 2.9
A1: Sub-structure 2.9
Foundations 2.9
Ground floors and sub-structure walls 2.18
A2: Superstructure 2.28
Minimum headroom heights 2.28
External walls 2.28
External cavity wall construction 2.35
Lateral restraint strapping of upper floors to walls 2.49
Lateral restraint strapping of roofs to walls 2.51
Lateral restraint strapping of walls at ceiling level 2.52
A3: Separating walls and floors 2.53
Masonry party walls separating dwellings 2.53
Double-leaf timber-frame party walls separating dwellings 2.54
A4: Internal partitions 2.56
A5: Intermediate upper floor(s) 2.56
Floor joists 2.56
Trimming and trimmer joists 2.58
A6: Pitched roofs 2.60
Pitched roof coverings 2.61
Pitched roof structure 2.62
A7: Flat-roof construction 2.70
Option 1: Flat roof with ‘cold deck’ 2.70
Option 2: Flat roof with ‘warm deck’ 2.72
Option 3: Flat roof with inverted ‘warm deck’ (insulation on top of waterproof coverings) 2.74
Option 4: Flat roof with green roof on ‘warm deck’ (either intensive or extensive) 2.74
The design, workmanship and selection of materials for flat roofs 2.75
A8: Mortars, renders and gypsum plasters 2.75
Cement mortars and renders 2.75
Gypsum plasters 2.77
Part B: Fire safety and means of escape 2.78
Fire detection and fi re alarm systems 2.78
Means of escape 2.79
Surface spread of flame: internal wall and ceiling linings including roof lights 2.89
Part C: Site preparation and resistance to contaminants and moisture 2.92
C1: Resistance to contaminants 2.92
Radon gas 2.93
Methane and other ground gas protection 2.96
C2: Resistance to moisture 2.96
Part D: Cavity wall filling with insulation 2.98
Part E: Resistance to the passage of sound 2.98
Part F: Ventilation 2.99
Purge (natural) ventilation 2.99
Mechanical extract ventilation and fresh air inlets for rooms without purge ventilation 2.99
Background ventilation 2.100
Intermittent mechanical extract ventilation 2.100
Part G: Sanitation, hot-water safety and water efficiency 2.100
Wholesome hot and cold water supply 2.100
Solar water heating 2.102
Electrical water heating 2.102
Insulation of pipework to prevent freezing 2.102
Supply (Water Fittings) Regulations 1999 2.103
Part H: Drainage and waste disposal 2.103
H1: Foul- and storm-water drainage 2.103
H2: Septic tanks, sewage treatment systems and cesspools 2.113
Septic tanks 2.113
Sewage treatment systems 2.114
Percolation tests 2.116
Cesspools 2.118
H3: Rainwater drainage and harvesting 2.119
H4: Building over or close to, and connections to, public sewers 2.122
Building over or close to a public sewer 2.122
Connections to public sewers 2.123
H5: Separate systems of drainage 2.124
H6: Solid waste storage 2.124
Part J: Combustion appliances and fuel storage systems 2.124
Solid fuel appliances up to 50 kW rated output 2.125
Appliances other than solid fuel 2.133
Fuel storage tanks 2.134
Renewable energy/micro regeneration installations 2.134
Part K: Protection from falling, collision and impact 2.135
Internal stairs, guarding and landings for changes in level of 600 mm or more 2.135
External stairs, guarding and landings for changes in level of 600 mm or more 2.138
Loft conversion stairs 2.139
Ramps 2.140
Part L: Conservation of fuel and power in existing dwellings 2.141
Areas of external windows, roof windows and doors 2.141
New thermal elements 2.141
Energy-efficient lighting 2.143
Insulation of pipework to prevent freezing 2.143
External walls, roofs, floors and swimming-pool basin 2.143
Renovation/upgrading of existing thermal elements 2.144
Part M: Access to and use of buildings for disabled 2.145
Part N: Safety glazing, opening and cleaning 2.146
Safety glass and glazing 2.146
Part P: Electrical safety 2.147
Electrical installations 2.147
External works – paths, private drives, patios and gardens 2.149
Section 3 New dwellings 3.1
Parts A and L: Starting point 3.4
Conservation of fuel and power in new dwellings 3.4
Criterion 1 – Achieving the Target Emission Rate (TER) 3.4
Criterion 2 – Limits on design flexibility 3.5
Criterion 3 – Limiting the effects of solar heat gain 3.5
Criterion 4 – Calculation of the Dwelling Design Emission Rate (DER) 3.6
Criterion 5 – Provision for energy-efficient operation of the dwelling 3.10
Insulation guidance details for floors, walls and roofs 3.10
Guidance on the Code for Sustainable Homes for new dwellings 3.12
Guidance on PassivHaus 3.18
Part B: Fire safety and means of escape 3.19
Part C: Site preparation and resistance to contaminants and moisture 3.20
Part D: Cavity wall filling with insulation 3.20
Part E: Resistance to the passage of sound 3.20
Part F: Ventilation to new dwellings 3.21
Ventilation systems 3.21
Purge (natural) ventilation to habitable rooms: system 1 – new dwellings 3.22
Background ventilation: system 1 – new dwellings 3.23
Intermittent mechanical extract ventilation: system 1 – new dwellings 3.24
Part G: Sanitation, hot-water safety and water efficiency 3.24
Part H: Drainage and waste disposal 3.25
Part J: Combustion appliances and fuel storage systems 3.26
Part K: Protection from falling, collision and impact 3.26
Part L: Conservation of fuel and power 3.26
Part M: Access to and use of buildings for disabled 3.26
Guidance on Lifetime Homes Standard for new dwellings 3.31
Part N: Safety glazing, opening and cleaning 3.32
Part P: Electrical safety 3.32
Section 4 Domestic loft conversions 4.1
Converting an existing loft space 4.3
Assessing the feasibility of your loft for conversion 4.3
Part A: Structure 4.5
A1: Inspection of the existing roof and building structure 4.5
A2: Alteration, modification and strengthening of the existing roof structure 4.5
A3: Roof conversion details 4.5
Upgrading existing external walls 4.5
Internal load-bearing timber stud walls 4.7
Part B: Fire safety and means of escape 4.11
Single-storey dwellings with loft conversion 4.11
Two-storey dwellings with loft conversion (or new third storey) 4.13
Part C: Site preparation and resistance to contaminants and moisture 4.17
Part D: Cavity wall fi lling with insulation 4.17
Part E: Resistance to the passage of sound 4.17
Part F: Ventilation 4.17
Part G: Sanitation, hot-water safety and water efficiency 4.17
Part H: Drainage and waste disposal 4.17
Part J: Combustion appliances and fuel storage systems 4.17
Part K: Protection from falling, collision and impact 4.17
Part L: Conservation of fuel and power in conversions 4.17
Part M: Access to and use of buildings for disabled 4.18
Part N: Safety glazing, opening and cleaning 4.18
Part P: Electrical safety 4.18
Section 5 Domestic garage and basement conversions into habitable rooms and conversion of barns and similar buildings into new dwellings 5.1
Assessing the feasibility of your building for conversion 5.6
Part A: Structure 5.14
A1: Underpinning works 5.14
Traditional underpinning 5.14
Sections through proposed underpinning (not to scale) 5.15
A2: Single-wall garage conversions (or similar buildings) into habitable rooms (typical details indicated in Figures 5.2–5.12) 5.16
Upgrading pitched roofs 5.16
Upgrading flat roofs 5.19
Infilling of garage door openings 5.20
Upgrading single-skin external walls 5.21
Upgrading garage ground floors (or similar) with upgraded enclosing single-skin walls 5.26
A3: Cavity wall garage conversions (or similar buildings) into habitable rooms (typical details indicated in Figures 5.16–5.26) 5.29
Upgrading pitched roof 5.29
Infilling of garage door opening 5.31
Upgrading external cavity walls 5.33
Upgrading garage ground floors (or similar) with enclosing upgraded cavity walls 5.34
A4: Basement conversions into habitable rooms 5.38
Existing basements and tanking systems 5.38
A5: Conversion of barns and similar buildings into new dwellings – Technical and practical guidance 5.40
Part A: Structure 5.40
Part B: Fire safety and means of escape 5.51
Part C: Site preparation and resistance to contaminants and moisture 5.51
Part D: Cavity wall filling with insulation 5.51
Part E: Resistance to the passage of sound 5.51
Performance standards 5.51
Part F: Ventilation to new dwellings 5.52
Part G: Sanitation, hot-water safety and water efficiency 5.52
Part H: Drainage and waste disposal 5.53
Part J: Combustion appliances and fuel storage systems 5.53
Part K: Protection from falling, collision and impact 5.53
Part L: Conservation of fuel and power in conversions 5.53
Energy Performance Certificate (EPC) 5.53
Part M: Access to and use of buildings for disabled 5.53
Part N: Safety glazing, opening and cleaning 5.54
Part P: Electrical safety 5.54
Section 6 Upgrading old buildings using lime and modern applications 6.1
Upgrading old buildings using lime and modern applications 6.3
Re-pointing and repair of existing buildings 6.4
Types of lime mortar, lime render/plaster and decorative finish suitable for breathable buildings 6.10
Index I.1
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