Chimney Engineering - Chimney New Builds

As traditional chimney builders we prefer to build or reinstate safe working chimneys that blend with the specific character of your house. Traditional British chimneys were once charming pieces of architecture at the heart of property design. How many of us, as children, have drawn houses without a chimney? Compared to stainless steel chimney systems and rendered pumice chimney systems; a brick chimney will add character to your home. We use modern pumice chimney systems integrated with traditional British building methods that will far out live any stainless steel chimney system.

This is a case study of a chimney build added to an existing 1950’s bungalow, starting with the tiled concrete foundations. Local council building control approval is needed and site visits arranged to inspect the structural, damp course and insulation implications. There is a science to how a chimney works, always ensure any builder or heating engineer you employ fully understands this as there are many myths regarding construction. One myth is that a chimney should have bends in it. In reality the perfect chimney will be as straight as the property layout will allow. Any bend will act as resistance to a good flow of gasses.

It is important to understand the correct chimney flue liner for its intended use (a 'chimney' is the brick structure that surrounds the ‘flue liner’). The flue liners are jointed with a special fire resisting compound and the void around the flue liner is filled using an insulating concrete mix. If the intended stove is known before the chimney is built then the relevant diameter liners should be used to suit that appliance (usually 150mm diameter).

If a chimney is of the correct height, the correct diameter, has a liner that is insulated and has adequate ventilation, then it is guaranteed to work.

In the following scenario the site specifics governed the larger dimensions of chimney stack needed to ensure the chimney terminated at a certain height that allowed the required distances from neighbouring properties, rooflines and roof windows as set out in part J of the building regulations. We used an ‘Anki’ pumice block chimney system to help give additional rigidity to the tall structure

The minimum base dimension of the stack as it passes through the flat roof is relevant to the maximum height of the finished structure, the larger its base the higher it can be.

Chimneys built incorrectly are a thorn in our side, solving problems caused at design and build stage can cost a lot and could be remedied early on saving unnecessary costs and dangers.