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A triple-glazed bay window projects 1.5 metres from the external wall of a dwelling house, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 1 - 2012
Question 1
A triple-glazed bay window projects 1.5 metres from the external wall of a dwelling house, as shown in the accompanying sketch. The external wall is a 350 mm concret... show full transcript
Worked Solution & Example Answer:A triple-glazed bay window projects 1.5 metres from the external wall of a dwelling house, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 1 - 2012
Step 1
To a scale of 1:5, draw a vertical section through the window, roof and front wall of the house.
Answer
To complete the vertical section drawing:
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Draw the Outline: Start by sketching the external wall, which is a 350 mm thick concrete block. Include the triple-glazed bay window that projects 1.5 meters from this wall. Make sure to represent the lean-to roof at a 30° pitch above the window.
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Construct the Roof Details: Illustrate the rafters, ensuring that insulated plasterboard is shown fixed to their underside, forming a sloped ceiling. Make sure the rafters are spaced appropriately (suggested 225 mm x 40 mm at 600 mm centers).
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Add Components Below Window: Show the elements within the 400 mm below the concrete lintels. This includes the fixed frame of the window, the wallplate, and rafters, clearly labeled.
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Include Dimensions: Provide dimensions, ensuring that the window’s position relative to the wall and roof is clearly indicated. Indicate the height to the top of the abutment (400 mm above the lean-to roof).
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Label Components: Clearly label parts, such as window, wall plate, rafters, and the insulated plasterboard.
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Ensure Accuracy: Double-check the scaling to maintain a 1:5 ratio throughout the drawing. This will help in ensuring that dimensions are represented correctly.
Step 2
Indicate on your drawing the design detailing that ensures moisture does not penetrate at the abutment of the roof and the wall of the house.
Answer
For detailing that prevents moisture penetration:
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Install a DPC (Damp Proof Course): Ensure there's a damp proof course at the junction where the roof abuts the wall. This prevents rising damp from the wall into the roof structure.
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Use Insulation Layers: Include insulation materials, layering the windtight membrane to guide moisture away from critical junctures.
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Create Proper Drainage: Design the roof overhangs to allow for runoff away from the wall, reducing the risk of water pooling at the abutment.
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Seal All Joints: Ensure that all joints between the roof and wall are sealed using appropriate waterproofing materials to prevent any ingress of moisture.
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Use Weatherproof Materials: Apply weatherproofing treatments on surfaces that are exposed to the elements, ensuring long-term protection against moisture ingress.