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Chimney Flue Liner Installation

Subject to the need for making a building control notification, there are no regulations to prohibit the installation of chimney liners as a DIY job. However, due consideration should be given to access and safety requirements.

Chimney liner should be installed generally in accordance with Building Regulations Part J.

Multi Fuel Chimney Liner Installation

The Basics

  1. Always work safely and in accordance with current health and safety requirements.
  2. Take sensible precautions when working at high levels by using scaffolding, access tower etc and always wear suitable protective clothing.
  3. The ends of chimney liners are sharp - wear gloves.
  4. Soot is acidic and can irritate you skin, eyes and lungs - wear a dust mask and goggles.
Survey & Preparation Work
  1. Sweep the chimney thoroughly to remove all soot deposits, tar and deposits - otherwise these can corrode the chimney liner once fitted.
  2. Check that the chimney is structurally sound and that all external surfaces are wind and watertight. The structure should be constructed of solid masonry of at least 100mm (4") thickness.
  3. Remove the chimney pot (unless using a suspending cowl), any damper plates, or other obstructions that will hinder the installation of the chimney liner. If there are bends or obstructions in the length of the flue the wall will require opening to ensure proper access and installation. 
  4. Determine the correct diameter of chimney liner required for the application. 
  5. Draw a sample 1 metre length of the correct diameter liner through the chimney to ensure that it will pass through any restrictions and changes of direction.
  6. Use only a single length of chimney liner - not short lengths jointed together.
  7. Consider if you require your chimney liner installation to be insulated. Insulating the liner will keep the gasses warmer and so reduce the chances of lack of up draught and/or condensation formation. It is recommended to use insulation when either the stack is very high, the stack is external or the stack is very large. Spaces between the lining and the surrounding masonry should not be filled with ordinary mortar. Insulate using one part ordinary Portland cement to 6 parts Micafil. Alternatively, if the stack is very large, liner insulation jackets may be used. If you are not insulating the complete stack, it is still recommended to insulate the first metre or so. This will encourage the heat into your room as opposed to between the liner and the stack.
Installation and Connection
  1. Take notice of the direction arrows and UP marking on the seam of the chimney liner. It is important that the chimney liner should be installed so that the arrows point up the chimney. This will allow any condensation to drain downwards over the internal joint.
  2. Attach a nose cone with a draw rope to what will be the bottom end of the chimney liner. Our 75mm cloth tape is ideal for this.
  3. Installation is a job for two.
  4. If the chimney liner insulation jackets are being used, fix this to the first section.
  5. First installer drops the draw rope down the flue.
  6. Second installer takes the rope at the bottom of the chimney and carefully pulls the chimney liner downwards whilst......
  7. the first installer guides the chimney liner over the top of the chimney and into the flue, taking care to avoid letting the chimney liner bend too sharply (i.e. less than three times the diameter of the chimney liner) or scrape over any sharp corner etc.
  8. Once the chimney liner is pulled all the way through the flue, connect the base of the chimney liner to the appropriate adaptor using stainless steel self tapping screws and seal with fire cement or Fortafix Ceramix.
  9. If Micafil insulation is to be used close the bottom of the flue. Mix one part ordinary Portland cement to 6 parts Micafil. Pour the insulation into the flue from the first of any openings making sure that the chimney liner is held centrally in the void and allowing the insulation to pour all the way round.
  10. Continue this process to the top of the chimney making sure that the void is filled with insulation to the top. Then either:-
If using the suspending cowl fixing method
  1. Attach the chimney liner suspending cowl to the chimney liner using the provided fixing straps.
  2. Insert the cowl into the chimney pot and attach using the straps provided.
If using the traditional method
  1. Insert the top sleeve into the end of the liner
  2. Fix the liner to the top of the chimney using a closure plate and top clamp
  3. Flaunch with a suitable mortar or fit a suitable chimney pot.
  4. Attach a chimney cowl to the top of the chimney pot.
Multi Fuel Chimney Liner Installation
Chimney Flue Liner Installation Guide Chimney Flue Liner Regulations Chimney Liner Gather Hoods


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