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A double-glazed timber casement window, as shown in the sketch, is fixed in a 300mm external concrete block wall with insulated cavity - Leaving Cert Construction Studies - Question 1 - 2006
Question 1
A double-glazed timber casement window, as shown in the sketch, is fixed in a 300mm external concrete block wall with insulated cavity. The wall is plastered on both... show full transcript
Worked Solution & Example Answer:A double-glazed timber casement window, as shown in the sketch, is fixed in a 300mm external concrete block wall with insulated cavity - Leaving Cert Construction Studies - Question 1 - 2006
Step 1
To a scale of 1:2 (half fill size), draw a vertical section through the concrete and timber cill of the window.
Answer
To complete this part, begin by drawing a vertical section of the window cill to a scale of 1:2. The window cill is 80mm x 80mm, so represent it accurately in dimensions on your drawing. Ensure to detail the structure of the cill, showing the concrete block wall of 300mm thickness with insulated cavity. Include all necessary components such as the double glazing, pre-cast concrete window cill, D.P.C (Damp Proof Course), insulation layer, and plaster layers. Include the features such as:
- 19mm External Render - covering the outer leaf of the wall.
- 100mm Concrete Block Outer Leaf - highlighting the main structural component.
- 40mm Residual Cavity - indicating the insulation space.
- 100mm Concrete Block Inner Leaf - showing the inner structural element.
- 13mm Internal Plaster - finishing layer inside the structure.
Label each part correctly, ensuring clarity in your drawing with dimensions and scale annotated.
Step 2
Indicate on your drawing one design detail that would prevent the cold-bridge effect at the window cill.
Answer
One effective design detail to prevent the cold-bridge effect at the window cill is the inclusion of an insulation layer within the cill structure. This can be depicted in your drawing as a continuous strip of insulation material situated behind the window cill, running between the external concrete block and the inner layers. For instance, showing a 25mm thick layer of insulation can significantly minimize heat loss through the cill. Additionally, including a throating or drip detail at the base of the cill will prevent water from running back towards the wall, further enhancing thermal performance. Specify these details with arrows or notes in your drawing for clarity.