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Dunbrik Chimney Block System Guide
systems for domestic chimneys
domestic flue & chimney systems Certificate No.FM24104
Dunbrik Chimney Block
systems for domestic chimneys
S YS T E M D E S C R I P T I O N
Domestic chimney system for construction in timber frame and traditional built houses.
The Dunbrik chimney block system comprises an outer concrete casing block with
mortared joints with an inner concrete 200mm id flue liner and an insulation wrap
between. The flue liners are jointed using a fire resistant mortar to a tongue and socket
detail. A precast chamber with integral gather unit allows a range of appliances to be used
along with any domestic fuel.
The system has been tested to BSEN 12446 together with structural details to determine
stability and windloading. This is achieved using a number of restraint brackets placed at
Traditional Fireplace floor and roof level locations along the length of the chimney system.
The system is designed for installation in both traditional and timber frame dwellings,
however allowances should be made at the design stage of the dwelling at floor and roof
junction levels for the fixing of the restraint brackets, and for suitable floor/foundation.
Liner Standards
British Standard BS EN 1857:2003 established performance standards for concrete flue
liners for domestic chimneys. Dunbrik liners have been tested by BSRIA and achieved the
highest categories in each class as follows:
Dunbrik Type A1 - T600 N1 G D 3
Performance data
T600 Temperature nominal operating temperature 600oC
N1 Gas tightness negative pressure test at 40 Pascal
G Sootfire resistance heat shock tested to 1,000oC for 30 minutes
D Condensate resistance for dry flue conditions
3 Corrosion resistance for all domestic fuels (new scrub test for durability)
Technical Assistance
Stove with pipe connection
Dunbrik Flues is the specialist manufacturer in the UK of concrete flue liner systems and
Courtesy of Dunsley Heating
gas flue block systems for domestic dwellings.
System details and guidance is available on our website www.dunbrik.co.uk.
We can also produce a flue costing based on your requirements, please contact our
technical staff for details.
Inglenook with canopy hood domestic flue & chimney systems
Courtesy of Potton
Design Features
The Chimney Block System has been specifically designed to make it quick, easy and
cost effective to incorporate a chimney within your house design. Its modular units
are designed to reduce the need for specialist skills.
You purchase the full system from recess units at floor level to chimney pot from
one specialised supplier.
You can install the majority of fires and stoves and can burn any domestic fuel; gas,
wood, solid fuel and oil.
The Chimney Block system is suitable for installation into Timber frame and
Traditional build construction and can also be constructed as a Retro-fit installation.
The system has been tested and complies with BS EN 12446
The Components
Flue Liners Manufactured and tested to the highest standards and conform
with BSEN1857
Insulation Allows for expansion and contraction of the flue liners within
the chimney structure and keeps the flue gases at a constant
temperature enabling them to flow freely. No need for infill
aggregate around the flue liners
Chimney Block Encases the other components to produce a chimney structure
Brackets Allows the system to be free standing while still being part of
the house structure
General Chimney Design and Regulation Guidance
The following may be of assistance in your chimney design and includes references to information sources.
Regulations
The chimney system should be built by a competent person with knowledge of regulations and building practices. Detailed requirements
for Ireland are set out in Technical Guidance Document J – Heat Producing Appliances. Guidance on chimney flashings is also given in the
Lead Sheet Association manual.
Chimney Dimensions and Clearances
A chimney height of 4.5mm or over is normally sufficient for flue draught (measured from the underside of the fireplace gather lintel to
the top of the chimney pot). The depth of the chimney foundation should be the same as any adjacent wall foundation.
A minimum 40mm air space should be maintained from the face of the chimney block to combustible material, unless it is a floorboard,
skirting, dado, picture rail, mantelshelf or architrave.
Chimney Lining
Liner joints should be sealed with fire cement and installed with the tongue pointing downward into the socket to contain moisture and
condensate in the flue.
Hearths
A construction hearth should be made of solid, non-combustible material such as concrete or masonry at least 125mm thick and to the
plan dimensions as showing in diagram 3 in Part J of the Irish Building Regulations. No combustible material should be placed under-
neath a constructional hearth unless there is an air space of 50mm or more or the combustible material is at least 250mm below the top
of the hearth.
Fireplace Recess
The recess units and gather lintel form a solid non-combustible fireplace recess. The opening formed by the three recess units is designed
to accommodate either a 400mm or 450mm standard Milner Fireback or open fireplace not exceeding 500 x 550mm.
Chimney Stack and Outlets
On roof pitches greater than 10o the height of the chimney stack shall not be less than 1m. Where the chimney stack is at the ridge or
within 600mm of it the height of the chimney may be reduced to 600mm. For other roof considerations consult diagram 1 – Part J of
the Irish Building Regulations.
Weather Proofing
To effectively weather-proof the chimney stack a concrete capping with drip throat and metal dpc tray is provided for at the top of the
chimney system. Lead Flashings are needed at the junction with roof tiles and chimney stack to prevent water penetration. On brick-
work stacks a lead saddle dpc tray should be installed across the full plan dimension of the stack at the intersection with the roof and
linked to stepped lead flashings. Details of the lead saddle trays and flashings are available from the Lead Sheet Association – Tel: 01892
822773. Where the stack has a waterproof render finish on all sides the lead saddle dpc tray may not be required at roof breakout point.
Air Supply For Combustion
An appliance needs air supply for combustion and for the efficient operation of the flue. Part J of the Irish Building Regulations sets out
the air supply requirements for solid fuel, gas and oil.
Dunbrik Technical Advice
For further guidance or advice on Dunbrik products contact us on 01924 373694 or fax on 01924 332878
or email at tech@dunbrik.co.uk
Dunbrik CB Flue Liners
systems for domestic chimneys COMPONENTS
CB1 Fireplace Recess Unit CB2 Fireplace Gather Lintel CB10 Raft Lintel for Stove Connection
Weight 50kg Weight 87kg Weight 95kg
Overall dimensions 800 x 450 x 215 Overall dimensions 800 x 450 x 220 Overall dimensions 1200 x 450 x 150
Three required for each flue to create a fireplace This is a structural lintel to span the fireplace recess, To span the fireplace recess and provide a
recess of internal dimensions - 600 wide, 350 deep gather into the flue and support the flue liners above. stove connection
and 675 high
200L600 200L150 Flue Liners CB4
Flue Liners 150mm tall Flue Installation Wrap
600mm tall Weight 5kg Weight 1.6kg
Diameter Dimensions
Weight 20.4kg 200mm internal 40mm wall thickness,
Diameter 260mm external 600mm tall Insulation
200mm internal 200L230 Flue Liners
260mm external This wraps around the liners
230mm tall to retain heat in
Weight 7.4kg
the chimney
Diameter
200mm internal
260mm external
CB3 Chimney Block Dunseal Fire Resistant Mortar CB16 Floor Joist Restraint Bracket
Weight 37kg Ready mixed mortar paste in 310ml cartridge for Weight 0.3kg
Overall dimensions 450 x 450 x 215 jointing flue liners Overall dimensions 100 x 117 x 75
To enclose the liners and form the outer To restrain chimney by bracing to joists at each floor
chimney casing level.
CB17 Rafter Restraint Bracket CB18 Chimney Tray CB5 Chimney Capping
Weight 0.2kg Weight 2.6kg Weight 27kg
Overall dimensions 100 x 100 x 30 Overall dimensions 488 x 488 x 26.5 Overall dimensions 588 x 588 x 60
To restrain chimney by bracing at truss Horizontal dpc tray to prevent damp
rafter level. penetration below the capping
Roll Top Chimney in TG260
Red or Buff Topguard steel cowl -
External diameter Red or Buff
Base 250mm / Top 280mm Weight 1.6kg
Internal diameter Overall 260mm tall
Base 210mm / Top 210mm
225mm internal diameter
CB13 Corbel Unit Height Weight
Weight 54kg Roll300 300 9kg
Overall dimensions 777 x 555 x 150 Roll450 450 14kg
To support brickwork Chimney Stack Roll600 600 18kg
BENEFITS OF A CHIMNEY
• A chimney adds appeal to a house
• A real fire turns a house into a home
• A natural draught flue promotes a
healthier atmosphere
BENEFITS OF A DUNBRIK
CHIMNEY BLOCK SYSTEM
• Full system from the specialist
manufacturer
• Detailed flue estimates prepared
• Systems designed for better flue flow
• Products designed for easier installation
• Liners meet latest, highest standards
• Expert technical backup
K E Y S Y S T E M F E AT U R E S
• Modular system for ease of installation
• Can be fitted into any type of house
construction and design
• Can be constructed as a
Retro-fit installation
• For domestic stoves and fires
• Can use all domestic fuel:
coal, wood, oil & gas
• Flue liners tested to highest
European standards
S E RV I C E S
• Flue estimating service
• Installation guides available on the web
or by post
Dunbrik (Yorks) Ltd
172 Ferry Lane,
Stanley,
Wakefield,
West Yorkshire.
WF3 4LT
Telephone: 01924 373694
Fax: 01924 332878
email: tech@dunbrik.co.uk
web: www.dunbrik.co.uk
March 2008
