Approved Document J: Skyworth Combustion Appliances & Fuel Storage Systems (EN)

O N L I N E V E R S I O N The Building Regulations 2010 J1 Air supply J2 Discharge of products of combustion J3 Warning of release of carbon monoxide J4 Protection of building J5 Provision of information J6 Protection of liquid fuel storage systems J7 Protection against pollution J APPROVED DOCUMENT Combustion appliances and fuel storage systems 2010 edition incorporating 2010, 2013 and 2022 amendments For use in England O N L I N E V E R S I O N

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O N L I N E V E R S I O N MAIN CHANGES IN THE 2010 EDITION MAIN CHANGES MADE BY THE FURTHER 2010 AMENDMENTS Section 1 New guidance has been included for access for visual inspection of concealed flues. This should ensure that flues can be properly inspected both when an appliance is first commissioned and subsequently serviced. This 2010 edition incorporates changes to reflect the renumbering of regulations in the Building Regulations 2010 and Building (Approved inspectors etc) Regulations 2010. There have been no changes to the requirements in Part J of Schedule 1 to the Building Regulations, but please note the simpler definition of ‘room for residential purposes’.

Section 2 Guidance has been included in support of a new requirement J3 “Warning of release of carbon monoxide” on the provision of carbon monoxide alarms where solid fuel appliances are installed. MAIN CHANGES MADE BY THE 2013 AMENDMENTS The provisions for flue outlet clearances relative to adjacent pitched roofs have been clarified in Diagram 17. These changes, which apply only to England, update the guidance on materials and workmanship. The guidance on the provision of hearths and wall clearances for solid fuel appliances have been made more flexible to take account of the availability of modern appliances.

MAIN CHANGES MADE BY THE 2022 AMENDMENTS Guidance has been added in support of requirement J3 “Warning of release of carbon monoxide” on the provision of carbon monoxide alarms where gas burning appliances and oil burning appliances are installed. Section 2, 3 & 4 The guidance for permanent ventilation openings for open flued appliances in very airtight houses (those with a design air permeability less than or equal to 5.0 m 3 /(h.m 2 )) have been increased to counteract the decrease in adventitious ventilation relative to older houses. Appendix F gives advice on assessing the air permeability of older houses in relation to this guidance.

Section 4 This section now explicitly includes liquid biofuel and blends on mineral oil and liquid biofuel within the scope of combustion installations designed to burn oil. Section 5 The guidance on identifying where secondary containment for oil tanks is necessary has been expanded to include locations in inner protection zone as shown on the Environment Agency’s groundwater sources map. Appendix G This informative appendix provides and explanation of the European designation system for certain flue and chimney products. O N L I N E V E R S I O N

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Contents

J O N L I N E V E R S I O N J Contents PAGE PAGE What is an Approved Document?

3 Connecting flue pipes 23 Repair of flues 23 How to use this Approved Document 3 Re-Use of existing flues 24 Where you can get further help 3 Responsibility for compliance 4 Use of flexible metal flue liners for the relining of chimneys 24 The requirements 5 Use of plastic fluepipe systems 24 Limitation on requirements 5 Factory-made metal chimneys 24 Types of building work covered by this Approved Document 5 Concealed flues 25 Notification of work 6 Configuration of natural draught flues serving open-flued appliances 26 Exemptions 6 Inspection and cleaning openings in flues 27 Materials and workmanship 7 Flues discharging at low level near boundaries 27 Supplementary guidance 7 Technical Specifications 7 Dry lining around fireplace openings 27 Condition of combustion installations at completion 27 Independent schemes of certification and accreditation 7 Interaction with other legislation 7 Notice Plates for hearths and flues 28 Maintenance 8 Access to combustion appliances for maintenance 28 The Requirements J1, J2, J3, J4, J5, J6 and J7 9 Section 2:

Additional provisions for appliances burning solid fuel (including solid biofuel) with a rated output up to 50kW 29 Section 0: General guidance 10 Introduction to the provisions 10 Explanation of terms used 10 Air supply to appliances 29 Size of flues 29 Measuring the size of flues and ducts 16 Height of flues 30 Section 1:

Provisions which apply generally to combustion installations 17 Outlets from flues 30 Connecting fluepipes 32 Performance 17 Air supply for combustion appliances 17 Location and shielding of connecting fluepipes 32 Permanently open ventilation of rooms 17 Debris collecting space 33 Permanent ventilation of appliance compartments 17 Masonry and flueblock chimneys 33 Ventilation of other rooms or spaces 17 Separation of combustible material from fireplaces and flues 34 Permanently open air vents 19 Factory-made metal chimneys 34 Provisions complying with both Part F and Part J 20 Lining and relining of flues in chimneys 34 Interaction of mechanical extract ventilation and open-flued combustion appliances 21 Formation of gathers 35 Hearths 37 Fireplace recesses and prefabricated appliance chambers 38 Provision of flues 22 Condensates in flues 22 Fireplace lining components 40 Construction of masonry chimneys 22 Walls adjacent to hearths 40 Construction of flueblock chimneys 22 Alternative approach 40 Carbon monoxide alarms 41 Material change of use 23 1 Approved Document J Combustion appliances and fuel storage systems O N L I N E V E R S I O N

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Contents

J CONTENTS O N L I N E V E R S I O N J PAGE PAGE Section 3:

Additional provisions, for gas burning appliances 43 Masonry chimneys 60 Flueblock chimneys 60 Gas safety (Installation and Use) Regulations 43 Factory-made metal chimneys 60 Gas fires (other than flueless gas fires) 45 Location and shielding of flues 60 Flueless gas appliances 45 Relining of flues in chimneys 60 Flues for appliances burning Class D oil 61 Air supply to gas fires and other appliances 45 Hearths for oil-fired appliances 61 Flued decorative fuel effect (DFE) fires 45 Shielding of oil-fired appliances 61 Flued appliances other than decorative fuel effect fires 45 Alternative approach 61 Air supply to flueless appliances 45 Carbon monoxide alarms 62 Size of natural draught flues for open flued appliances 47 Section 5:

Provisions for liquid fuel storage and supply 63 Height of natural draught flues for open flued appliances 48 Performance 63 Heating oil storage installations 63 Outlets from flues 48 Protective measures against fire 63 Provision of flues 51 Connecting fluepipe components 52 Oil supply pipe systems:

means of automatic isolation 64 Masonry chimneys 52 Provisions where there is a risk of oil pollution 64 Flueblock chimneys 52 LPG storage installations 64 Factory-made metal chimneys 52 Tank location and protective measures 65 Location and shielding of flues 52 Location and support of cylinders 65 Relining of flues in chimneys 52 Debris collection space for chimneys 53 LPG pipework (Informative) 67 Bases for back boilers 53 APPENDICES Hearths 54 Appendix A: Checklist for checking and testing of hearths, fireplaces, flues and chimneys 68 Shielding of appliances 54 Alternative approach 55 Carbon monoxide alarms 55 Appendix B: Opening areas of large or unusual fireplaces 70 Appendix C:

Example calculation of the ventilation requirements of a gas fired appliance 71 Section 4: Additional provisions for oil burning appliances 56 Scope 56 Appliances fitted in bathrooms and shower rooms 56 Appendix D: Example calculation of the ventilation requirements of an oil fired appliance 72 Air supply to appliances 56 Size of flues (other than balanced flues and flues designed to discharge through or adjacent to walls) 56 Appendix E: Methods of checking compliance with requirement J2 73 Appendix F: Assessing air permeability of older dwellings in relation to permanent ventilation requirements 76 Outlets from flues and flue heights 56 Flues for oil-fired appliances:

flue gas temperature 59 Appendix G: European chimney designations 77 Provisions for flue gas temperatures in excess of 250°C 59 Appendix H: Addressees 79 Provisions for flue gas temperatures not exceeding 250°C 59 Standards referred to 80 Other publications referred to 82 Connecting fluepipe components 59 Index 83 2 Combustion appliances and fuel storage systems Approved Document J O N L I N E V E R S I O N

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