Issues for Good Chimney Design

These are the main issues to consider in chimney design and the way to avoid problems.

1.  Flue Gas Temperature

Poor or No Insulation can result in a dramatic reduction of flue gas temperatures significantly reducing the performance of the appliance and causing condensation.

Solution: Pumic is a natural insulator. Consistant quality insulation throughout the height of the chimney as provided by the Isokern Chimney Systems, will maximise the discharge of the flue gases.

2.  Acid Resistance

When the gases condense they form a strong acidic solution on the walls of the flue.

Solution: The consistant insulation throughout in the Schiedel Isokern Chimney Systems will help prevent the gases condense. Should an acidic solution build up the acid resistant nature of clay liners will minimise the impact of the acid.

3.  Soot Build Up

Soot and condensate deposits form on the inner wall of the flue liner. These deposits can re-ignite and cause a chimney fire.

Solution: The smooth surface of the Pumice DM system and liners is less likely to encourage soot build up.

4.  Heat Resistance

Excessive temperatures caused by soot fires can crack the flues & brick work  leaving the chimney exposed to leaks and moisture penetration.

Solution: Pumice is a natural insulator and is more resistant to damage caused by chimney fire than other products. 

5. Thermal Stress

The flue liner needs space for expansion &
contraction.

Solution: Pumice does not expand or contract with temperature change. This reduces the possibility of cracking and structure damage that can occur with other products.

6. Flue Design

 Bends reduce the performance of the chimney.

Solution: Design the chimney as straight as possible. 

7. Water Ingress

Without  protection water can penetrate through poor mortar joints or porous brick onto the chimney breast.

Solution: Chimneys trays should always be used with brick work.