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The sketch shows portion of a single storey dwelling house having a 300 mm concrete block external wall with insulated cavity - Leaving Cert Construction Studies - Question 1 - 2007
Question 1
The sketch shows portion of a single storey dwelling house having a 300 mm concrete block external wall with insulated cavity. The house has an internal span of 0.5 ... show full transcript
Worked Solution & Example Answer:The sketch shows portion of a single storey dwelling house having a 300 mm concrete block external wall with insulated cavity - Leaving Cert Construction Studies - Question 1 - 2007
Step 1
a) To a scale of 1:10, draw a vertical section through the external wall, window and roof structure.
Answer
To complete this task, begin by drawing a vertical section of the external wall, maintaining a scale of 1:10. Ensure the section includes:
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Foundation Details: Start with the concrete foundation, 300 mm below the concrete wall, indicating the type of concrete and any drainage features.
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Wall Construction: Draw the 300 mm concrete block wall which houses an insulated cavity. Make sure to show the external render and any damp proof courses.
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Window Frame: Include the double-glazed wooden window frame (dimensions 45x45 mm) with the drainage channel and external cill.
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Roof Structure: The roof is pitched at 30 degrees. Start from the wall, illustrate the timber roof structure, including ceiling joists supported on the wall.
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Slate Tiles: Add three courses of slate at the eaves and show the ridge board at the top of the roof.
Ensure that details are precise and aligned with standard construction practices.
Step 2
b) Indicate on the drawing the design detailing which ensures that moisture does not penetrate to the inner wall at the window head.
Answer
To prevent moisture penetration at the window head, the following design details should be incorporated:
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Drip Edge: Include a drip edge above the window that directs water away from the window frame.
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Damp Proof Course (DPC): Ensure that a DPC is installed at the window cill level to prevent rising damp.
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Flashing: Incorporate flashing around the head of the window to channel any water that lands on the exterior surface away from the frame.
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Polyethylene Insulation: Add a layer of polyethylene insulation behind the window to further block moisture from penetrating into the inner wall.
Indicate these elements clearly on your drawing, ensuring their position relative to the window frame is accurate.