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A triple glazed timber casement window is fixed in the external wall of a dwelling house, as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2011
Question 1
A triple glazed timber casement window is fixed in the external wall of a dwelling house, as shown in the sketch. The external wall is a 350 mm concrete block wall w... show full transcript
Worked Solution & Example Answer:A triple glazed timber casement window is fixed in the external wall of a dwelling house, as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2011
Step 1
(a) Draw a vertical section showing the fixed window frame and the concrete lintels.
Answer
To start, establish the scale of your drawing at 1:5. Begin by sketching the external wall, which consists of a 350 mm concrete block wall. Ensure the outer leaf is represented as 100 mm thick. Illustrate the insulated cavity, noting the thermal insulation with a capacity of 100 mm, while the internal leaf must also be drawn with a 100 mm thickness.
Next, depict the triple-glazed window frame measuring 150 mm x 80 mm. Include the pre-stressed concrete lintels at the top, measuring 100 mm x 70 mm, and be sure to show the concrete block's inner leaf and the plaster finishes (15 mm external plaster and 15 mm internal plaster).
For the dimensions, mark typical dimensions in suitable locations:
- Total wall width (350 mm).
- Length of the window frame (150 mm).
- Height from 300 mm below the lintel to 400 mm above the lintels.
- Thermal insulation depth (100 mm). This will provide clarity to your illustration and meet the requirements.
Step 2
(b) Show clearly on the drawing the flashing (dpc) and the insulation at the window head.
Answer
In your drawing, clearly illustrate the damp-proof course (DPC) at the window head. The flashing should be represented distinctly, indicating its position prominently at the upper portion of the window frame. Ensure that it meets building regulations.
Additionally, indicate the insulation around the window head, making sure to show how it integrates within the existing wall composition. This can be represented by shading or color differentiation to highlight its position. By emphasizing these elements, you will ensure that the key details of the construction are apparent in your section detail.