Jan
27
2012

Not Just a Smokestack – 3 Common Problems with Chimneys

An article by admin

In principle, a chimney is a very simple piece of ancient technology. Normally, it is a continuous duct, or flue, from a room to the open air. As the pressure at the bottom of the duct is lower than that at the top, smoke and other gases are drawn up the chimney.

Chimney Repairs Manchester / Roofers Birmingham / Roofer Manchester

Obviously, there must be an adequate difference in pressure between room and roof for this to work, so chimney height, holes that reduce the pressure and even over-effective double-glazing in the room can have an impact.

It is essential that a fireplace has adequate ventilation to the outside, as it must be able to remove from the room the carbon monoxide created by a fire. Why so important? Carbon monoxide (CO) is a poisonous gas, which kills by slowly replacing the oxygen in the bloodstream. The recommended level of the gas in any room is no more than fifty parts per million. Above that, drowsiness and sleep can result, followed by a very unpleasant outcome. If your chimney is showing signs of wear from the outside, consider calling on a roofing company or chimney repair expert to look at the chimney for you.

Roofers in Birmingham / Roofing Manchester / Roofer Birmingham

It is also wise to buy a CO detector if there is an open fire or stove in any room in the house. This is similar to a smoke detector, triggering if the level of CO rises to a dangerous level. Luckily, it is also easy to spot the most common signs of problems that may cause carbon monoxide to accumulate.

If a fire does not ‘draw’ even when the chimney is warmed up, or pieces of brick, mortar or soot drop into the hearth, it is time for action. The most likely cause is that the flue is restricted by soot or debris, and possibly the flue is damaged in some way. This can cause a considerable fire hazard as well as gas build up, especially in older properties where joists may be built into the brickwork of the stack. Again, consider using the services of a roofing company or someone who is experienced in chimney repairs.

It may also be sensible to have the chimney swept. An experienced roofer or chimney installer should then check for any obstruction or damage. It is likely that they will carry out a smoke test to ensure that there is adequate draw to rid the room of fumes. A CCTV check will determine if the flue or chimney is damaged. Ensure that a chimney specialist, not a jobbing builder, carries out any construction or repair work.

Another symptom of problems is the chimneybreast becoming excessively hot, or stains appearing on the wall. This may also occur in the room above and is a sign that condensed tar or acids are eating into the brick or mortar.

If the inside of the flue is seriously damaged it may be possible to insert a flue liner to solve the problem without the need to rebuild the chimney stack. Liners may be stainless steel or ceramic tubes, flexible or rigid, depending on the requirement. Once again, consult an expert to check for damage. A trained, professional installer will be able to certify the work once it is completed.

Finally, if you suspect any problem with CO or smoke from the fire in a room, take action immediately. Death from fire or carbon monoxide poisoning is a very real threat.