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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
Start by sketching the vertical section of one external wall and one rafter at a scale of 1:10. Include the following components in the diagram:
- Timber Frame: Show the 200 mm timber frame with appropriate detailing for the inner leaf and outer leaf construction.
- Insulated Service Cavity: Represent the 60 mm cavity with insulation details, ensuring to include the vapor barriers.
- Roof Details: Illustrate the trussed rafters, showing the angle of pitch at 30 degrees.
- Eaves and Ventilation: Demonstrate the detail of eaves, including three courses of slate, and indicate the ventilation path to the roof.
- Scale: Ensure all dimensions are clearly marked to reflect the 1:10 scale correctly.
Step 2
Indicate clearly the design detailing to ensure airtightness at the junction of the ceiling and the external wall.
Answer
To ensure airtightness at the junction of the ceiling and the external wall, follow these details:
- Sealant Application: Use appropriate sealants at all junctions to prevent air leakage.
- Vapor Barrier: Install a vapor barrier between the ceiling joists and the top of the wall to reduce moisture ingress.
- Insulation layers: Ensure insulation is tightly fitted without gaps, reaching from the ceiling to the wall junction to further enhance airtightness.