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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 create a vertical section at a scale of 1:10, follow these steps:
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Set Up the Scale: Begin by establishing the scale for the drawing, converting each measurement to the scale of 1:10. This means that every 10 mm on your paper will represent 100 mm in reality.
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Outline the External Wall: Start by drawing the 300 mm thick concrete block wall with the insulated cavity. Indicate the insulation layer as well, showing its position within the wall.
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Draw the Window: Sketch the double-glazed wooden casement window, emphasizing its height of 1.2 meters. Position it in the section approximately 300 mm below the top of the wall, and ensure you include the drainage channel below the window.
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Detail the Roof Structure: Include the traditional cut roof pitched at 30 degrees. Depict the ceiling joists supporting the roof centrally over the wall.
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Eaves and Slate Course: Show three courses of slates at the eaves of the roof. Make sure to detail how these are layered and positioned to provide proper drainage.
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Final Review: Ensure that all components (walls, window, eaves) are accurately represented and labeled with relevant dimensions to align with the marking scheme images provided.
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 indicate the design detailing preventing moisture penetration at the window head:
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Incorporate DPC (Damp Proof Course): Ensure that a DPC is present around the window frame. This is ideally wrapped around the concrete cill, forming a barrier against moisture ingress.
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Use a Drip Detail: Include a drip ledge or similar detail below the window sill to direct water away from the window frame and prevent pooling, which can lead to moisture seepage.
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Adjust the Window Cill: The window cill should be designed to project slightly beyond the wall face, further encouraging water runoff.
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Provide Adequate Flashing: Show flashing details that are integrated at the head of the window. This flashing should extend beyond the window edges to divert water away effectively.
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Label the Details: Make sure all these features are clearly labeled on the drawing for clarity and to fulfill the requirements specified in part (b).