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The sketch shows portion of an external wall, roof and a window of a dwelling house - Leaving Cert Construction Studies - Question 1 - 2010
Question 1
The sketch shows portion of an external wall, roof and a window of a dwelling house. The external wall is a 350 mm concrete block wall with an insulated cavity. The ... show full transcript
Worked Solution & Example Answer:The sketch shows portion of an external wall, roof and a window of a dwelling house - Leaving Cert Construction Studies - Question 1 - 2010
Step 1
To a scale of 1:10, draw a vertical section through the external wall, window and roof structure.
Answer
Begin by establishing a vertical section through the external wall, ensuring that you maintain a scale of 1:10.
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External Wall Section: Draw the 350 mm concrete block wall, indicating the insulated cavity within. Label the external wall and mention that the cavity provides thermal insulation.
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Window Details: Illustrate the triple-glazed wooden casement window in its position on the wall. Ensure the window frame (150 mm x 80 mm) and its height (600 mm) are accurately represented.
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Roof Structure: Depict the prefabricated trusses, ensuring the pitch of 30 degrees is clearly indicated. The internal span should also be mentioned (6.0 m).
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Typical Dimensions: Include the following dimensions:
- Wall thickness: 350 mm
- Window frame: 150 mm x 80 mm
- Height of the window: 600 mm
- Insulation cavity size: typically represented as 50 mm. Position the typical dimensions appropriately on your drawing to enhance understanding.
Step 2
Indicate clearly on the drawing how the cavity is closed at wallplate level.
Answer
To show how the cavity is closed at wallplate level, include the following in your drawing:
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Cavity Closure Detail: Illustrate the cavity closure using a wall plate. This is usually set at the top of the external wall and covers the gap between the wall and the roof structure.
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Material Specification: Indicate the typical wall plate size (100 mm x 75 mm) as specified in the marking scheme.
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Connections: Show how the wall plate connects to the rafters, ensuring to depict any necessary detailing (e.g., fixings).
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Slate Courses: Lastly, illustrate three courses of slate at the eaves, indicating the waterproofing aspect of the roofing system. Provide dimensions where necessary to clarify these features.