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Installing a Flue Liner

If your house was built before World War II, there's a good chance that its chimney is unlined, and is simply a rectangular duct whose brickwork is either stuccoed with cement or exposed. Over the years, corrosive elements in the rising, combustion gases eat into the chimney's mortar and brickwork and weaken it, allowing condensation to pass through and form damp patches on the outside and, in extreme cases, letting smoke seep through. This is particularly true where coal or wood burning appliances are in use.

Choosing a Flue Liner

A popular type of liner is a one-piece, corrugated tube of stainless steel that is easily fed into a chimney that has bends in it. Unfortunately, this type of liner is not suitable for use with coal or wood-burning appliances. To install it you must get onto the roof and erect scaffolding around the chimney.

First sweep the chimney, then Chop away the mortar around the base of the chimney pot. If installed, with a hammer and cold chisel. Carefully remove the pot—it will be heavy —and lower it to the ground with rope.  Clean up the top of the chimney to expose the brick work.

The Liner into The Chimney

From The top, drop a strong weighted line down the chimney and attach its other end to conical end piece of the flue liner. Have an assistant pull gently on the line from below while you feed the liner down into the chimney. When the conical end piece emerges below remove it and connect the liner to the closure plate across the base of the chimney or to the flue outlet of the heating appliance. Seal the joint with fiberglass packing and some appropriate cement.

Return to the roof, fit the top closure plate, and bed it in mortar laid on the top of the chimney, adding extra mortar to match the original. Finally, fit a cowl to the top of the liner—choose one appropriate to the heating appliance being used.

Installing a one-piece flue liner

You can deal with these problems installing a flue liner, which will prevent the corrosive elements from reaching the brick and mortar. It will also reduce the size of the flue speeding up the flow of gases and preventing their cooling and condensing. The draft of air through the flue will improve and the fire will burn more efficiently.

However, it is important to fit the type of liner that’s appropriate to the kind of heating appliance being and to be sure the size is large enough to keep the fireplace from smoking. Ask your dealer or inspector. Linins are tubes, one-piece or in sections, of metal or other material.


You can rent easy-so-use, light-alloy roof scaffolding. Two units will make a half platform for a central or side chimney; four will provide an all-round platform.
Flue liners can be purchased here:

Please visit our workshop @


34 Raven Road, Timperley, Altrincham, Cheshire, WA15 6AP, United Kingdom 

Meet The Rocky Joiners







Please visit our workshop @ 


34 Raven Road, Timperley, Altrincham, Cheshire, WA15 6AP, United Kingdom