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A concrete block chimney stack with a sand/cement render passes through a cut roof which is slated and is pitched at 45°, as shown in the sketch - Leaving Cert Construction Studies - Question 7 - 2011
Question 7
A concrete block chimney stack with a sand/cement render passes through a cut roof which is slated and is pitched at 45°, as shown in the sketch. (a) To a scale of ... show full transcript
Worked Solution & Example Answer:A concrete block chimney stack with a sand/cement render passes through a cut roof which is slated and is pitched at 45°, as shown in the sketch - Leaving Cert Construction Studies - Question 7 - 2011
Step 1
Show two design details that will help prevent the occurrence of a downdraught in a chimney
Answer
For the design details intended to minimize the occurrence of downdraughts, consider:
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Chimney Cap Design: Sketch a chimney cap that extends at least 600mm beyond the flue, designed to deflect wind away from the flue opening. The cap should also incorporate mesh to prevent birds and debris from entering the chimney.
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Wind Barrier: Introduce a wind barrier on the side of the chimney exposed to prevailing winds. This barrier should be a minimum of 1 meter high, constructed using solid weather-resistant materials, which will redirect the flow of air around the chimney and minimize air pressure effects that could lead to downdraughts.
Both design features should be dimensioned appropriately to illustrate their effectiveness in the prevention of downdraughts.