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A chimney stack projects through a pitched roof at ridge level as shown - Leaving Cert Construction Studies - Question 7 - 2021
Question 7
A chimney stack projects through a pitched roof at ridge level as shown. The chimney is of solid concrete block construction with a sand/cement render finish. The tr... show full transcript
Worked Solution & Example Answer:A chimney stack projects through a pitched roof at ridge level as shown - Leaving Cert Construction Studies - Question 7 - 2021
Step 1
To a scale of 1:5, draw a vertical section through the centre of the chimney stack and roof structure.
Answer
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Outline the Chimney Stack: Start by drawing a rectangle to represent the chimney stack, ensuring it is centrally located in your drawing. Use the specified scale (1:5) accurately.
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Add Flue Liner: Inside the chimney block shape, draw the flue liner accurately, indicating its internal dimensions. The flue liner is essential for smoke ventilation.
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Detail the External Render Finish: Add a layer to represent the sand/cement render finish on the exterior of the chimney stack.
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Include Chimney Capping: At the top of the chimney stack, draw the chimney capping, which protects against weather elements. This should be wider than the chimney stack.
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Draw Roof Structure Elements: Illustrate the roof structure extending from the chimney, including rafter, counter battens, and slates.
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Slate Courses: Ensure to include three courses of slate on each side of the chimney stack accurately positioned to reflect the roof pitch of 45°.
Step 2
On your drawing, show two typical design details to prevent the penetration of moisture at the junction of the roof and chimney stack.
Answer
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DPC at Roof Level: Include a damp proof course (DPC) level at the junction of the chimney and the roof to prevent water ingress. This is a critical detail ensuring that moisture does not penetrate through to internal structures.
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Lead Flashing: Illustrate two layers of lead flashing around the base of the chimney stack where it meets the roof. This provides a weather-tight seal and directs water away from the junction.