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October 31, 2016 By wakefordfire

A Chimney Horror Story

blocked-flue

In the sunny September of 2016, we were called to a client’s property to replace a stainless steel liner that was fitted by another company a few years before. Before arriving at the property, we were told the stove was emitting an unpleasant smell and the customer’s chimney sweep had informed them that the liner needed replacing.

We removed the rain cap from the top of the chimney and very quickly discovered the reasons for the troublesome stove. As a little background: the chimney is the flue way and its job is to remove products of combustion from the house and into atmosphere as quickly and efficiently as possible. It does this by using the simple physics of heat rising: the hotter the fire, the hotter the air and the faster it travels in an upward direction.

For the flue to be most effective, the air travelling up it needs to be as clean and as hot as possible. That is why the choice of stove, but even more importantly, the selection of fuel is so important. Choosing a higher quality of fuel will result in better combustion and more heat produced. More about this later…

So, standing at the top of this beautiful house having just removed the rain guard, we gazed down the chimney into what should have been a shiny 150mm diameter stainless steel liner. Unfortunately our investigation revealed a gruesome reminder of why it is so important to make sure you are burning dry wood and that your stove is running as hot as possible by maximising combustion.

Over time a significant amount of tar had built up, clinging to the inside of the liner, reducing the diameter more and more each time the stove was used. The problem is at its worst at the top, the coldest part of the flue, where the hot gasses have cooled the most. In this case, the last 6 to 8 feet of the liner had a space of about two 50p pieces.

Considering the liner should have been 150mm (6 inches) in diameter we were surprised there hadn’t already been serious health issues. Discovering the existing liner was beyond repair, it was time to remove it from within the 250 year old brick-built chimney.

beyond-repair

Flexible liners are made of stainless steel and vary in length depending on the chimney they are lining. While they’re not light weight, they’re not too heavy either. But as we removed this liner, the extent of the damage began to show simply in just how heavy it was. The sheer amount of combustible material that filled the liner was so bad that in places that it began to crumble and fall out the bottom in coal-like chunks. This wasn’t even the full extent of the damage as the outside of the liner was slick with sticky tar and the bonfire-like smell spread everywhere.

It was a close call with a liner in this state as the damage was so widespread that using the stove could not only have exacerbated all the prominent issues but it could also have been lethal. It is the flue’s job is to remove gases from combustion safely out of the room, however, if these gases can’t escape through the flue due to tar build up these gases can only escape into the room. This can lead to real health risks like carbon monoxide poisoning that can be lethal.

Making sure the fuel you’re burning is dry and that the stove is combusting as efficiently as possible can all help to avoid build up like this. So give a wood burning stove the care and attention it deserves and help prevent combustible build up like this.

Filed Under: Uncategorized Tagged With: chimney


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New fireplace with electric fire.Woking, Surrey.
“A no fuss professional who knew exactly what he was doing and carried out work to a very high standard. He didn’t just disconnect the supply, but removed the pipe to ensure it was obscured from view for new installation, so absolutely no need to guide on the aesthetics, which means a lot to us ladies! He protected all surrounding area with dust sheets and hovered up afterwards – what more could y… Read more
Disconnected and decommissioned gas fire.Ashford, Kent.
“Adam the owner was so helpful in advising us around our log burner decisions and answered all my questions (there were a lot!) without any bother. He was able to advise what would work best in the space that we had and talked through various options, we are really impressed with his service. The end result is great and we can’t wait to use the new burner!”
New log burner fitted and chimney lined.Guildford, Surrey.

“This is the second stove we’ve had fitted by Wakeford’s, the first installation was fairly simple with the second being more complicated, both installations were carried out very professionally, on time and once commissioned, (apart from our new stove installation) we wouldn’t have known they had been here, spotless. The fitters were very pleasant, Adam was very accommodating and made sure all … Read more

Stove and Flue InstallationShepperton, Surrey
“It was a very professional service for the design to final installation.”
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