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A chimney stack projects through the pitched roof of a house as shown - Leaving Cert Construction Studies - Question 7 - 2016
Question 7
A chimney stack projects through the pitched roof of a house as shown. The chimney stack is of solid concrete block construction with an external sand / cement rende... show full transcript
Worked Solution & Example Answer:A chimney stack projects through the pitched roof of a house as shown - Leaving Cert Construction Studies - Question 7 - 2016
Step 1
Include the design details to prevent the penetration of rainwater between the chimney stack and the adjoining roof surface.
Answer
In the design, utilize a lead tray to collect water and direct it away from the chimney stack. Make sure to include adequate counter flashings to ensure a watertight seal around the chimney. Add a fillet piece near the chimney base to aid in the water flow. Furthermore, integrate a cowl or protective details that help in preventing downdraught and potential rainwater ingress.
Step 2
Include typical dimensions as appropriate.
Answer
Ensure to provide typical dimensions for the chimney stack and its components while drawing:
- Cowl dimensions: Typically 300 mm in height and 250 mm in diameter.
- Flue liner dimensions can vary but typically range around 200 mm for standard installations.