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The sketch shows portion of the roof and external wall of a single-storey dwelling house - Leaving Cert Construction Studies - Question 1 - 2014
Question 1
The sketch shows portion of the roof and external wall of a single-storey dwelling house. The house has an internal span of 6.0 metres. The external wall is of timbe... show full transcript
Worked Solution & Example Answer:The sketch shows portion of the roof and external wall of a single-storey dwelling house - Leaving Cert Construction Studies - Question 1 - 2014
Step 1
To a scale of 1:10, draw a vertical section through one external wall and one rafter length.
Answer
- Begin by setting the scale to 1:10.
- Draw a vertical line representing the external wall, indicating a height of approximately 2.4 meters (240 cm) based on standard ceiling heights.
- Illustrate the timber frame construction using labeled lines for the 200 mm timber frame inner leaf and the rendered concrete block outer leaf.
- Indicate a 60 mm service cavity between the inner and outer leaves.
- Next, draw the rafters beginning at the ridge, extending down to the eaves. Each rafter should reflect a pitch of 30 degrees.
- Include a section of the roof showing the slate tiles, ensuring to depict three courses at the eaves.
- Clearly illustrate ventilation openings, labeled to indicate their purpose.
Step 2
Indicate clearly the design detailing to ensure airtightness at the junction of the ceiling and the external wall.
Answer
- At the junction of the ceiling and the external wall, include a clear illustration of the insulation levels, detailing where the insulation is placed in relation to the wall and ceiling junction.
- Show the use of vapor barriers, positioned adequately to prevent moisture ingress. This is typically located on the warm side of the insulation.
- Indicate any treatment for sealing joints, such as using sealant around the perimeter of the ceiling joists where they meet the wall.
- Highlight the use of materials like OSB or plywood with taped joints for added airtightness.
- Label all components to enhance clarity and demonstrate best practices for achieving airtightness.