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The sketch shows a tiled roof of a dwelling house, which is supported on a 330 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 1 - 2012
Question 1
The sketch shows a tiled roof of a dwelling house, which is supported on a 330 mm external concrete block wall with an insulated cavity. The roof is a traditional cu... show full transcript
Worked Solution & Example Answer:The sketch shows a tiled roof of a dwelling house, which is supported on a 330 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 1 - 2012
Step 1
To a scale of 1:5, draw a vertical section through the eaves of the tiled roof and the external wall.
Answer
To illustrate a vertical section of the roof and wall:
- Start with the scale: Use a scale of 1:5, meaning that every 1 unit on the drawing represents 5 units in reality.
- Draw the External Wall: Begin by sketching the 330 mm thick concrete block wall, ensuring the scale is maintained. Use dotted lines for the insulation cavity.
- Create the Roof Structure: Draw the pitched roof at 45°, including tiles at the top of the section. Make sure to represent tile courses accurately up to the eaves.
- Detail the Insulation and Ventilation: Include the insulation layer noted for compliance with current Building Regulations just below the tiles, and illustrate the pathway for ventilation at the eaves, ensuring clarity in the path's direction.
- Incorporate Dimensions: Mark three typical dimensions prominently, indicating distances between key structural elements.
Step 2
On your drawing, show one method of closing the cavity at eaves level.
Answer
In terms of closing the cavity at eaves:
- Closure Method: Implement a proprietary cavity closer within the cavity at the top of the wall. This ensures that the cavity remains sealed, providing thermal insulation while maintaining structural integrity.
- Fixing Option: Additionally, fix a slate or similar material to both leaves at the eaves to close the cavity neatly, preventing moisture ingress and enhancing the stability of the eaves structure.