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A triple-glazed wooden casement window, as shown, is fixed in a 400 mm external concrete block wall with a full-fill insulated cavity - Leaving Cert Construction Studies - Question 5 - 2017
Question 5
A triple-glazed wooden casement window, as shown, is fixed in a 400 mm external concrete block wall with a full-fill insulated cavity. The fixed frame of the window ... show full transcript
Worked Solution & Example Answer:A triple-glazed wooden casement window, as shown, is fixed in a 400 mm external concrete block wall with a full-fill insulated cavity - Leaving Cert Construction Studies - Question 5 - 2017
Step 1
To a scale of 1.5, draw a vertical section through the external wall and bottom portion of the window, showing the fixed frame of the window and the concrete cill.
Answer
- Start by sketching the concrete block wall, measuring 400 mm thick, and ensure to indicate the filled insulation cavity.
- Draw the external leaf and the internal plaster with dimensions. The fixed frame of the window should measure 100 mm in width and 80 mm in height.
- Illustrate the typical details including a 19 mm external render, wall ties, and insulation:
- Use a proprietary cavity closer at the top of the frame.
- Include a 200 mm full-fill cavity insulation within the wall.
- Show a damp-proof course (dpc) to prevent moisture ingress, wrapped around the window frame.
- Dimension the drawing and highlight the critical details as requested, ensuring you emphasize three typical dimensions, like the back of the concrete cill to the sill.
- Ensure that the framing of the triple glazing is accurately depicted, with the glass noted accordingly, and includes a 25 mm width of the window board.
Step 2
Show on your drawing the typical design detailing to prevent the formation of a thermal/cold bridge at the concrete cill.
Answer
- Indicate the insulation placed at the back of the concrete cill to prevent thermal bridging.
- Draw the damp-proof course (dpc) wrapped around the concrete cill clearly to show its role in moisture prevention.
- Include an expanded metal mesh to prevent shrinkage cracks between the insulation and concrete blocks, ensuring structural integrity.
- Ensure that the triple-glazed frame encapsulates these details, demonstrating an understanding of building regulations for insulation and moisture control.