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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
To a scale of 1:5 draw a vertical section through the top portion of the window showing the fixed window frame and the concrete lintels.
Answer
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Setting the Scale: Begin by establishing a drawing scale of 1:5. This means every 5 mm on paper will represent 25 mm in reality.
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Draw the External Wall: Start the diagram by drawing the external wall, which is 350 mm thick, representing the outer block layer and the insulated cavity. Indicate this on the left side of the drawing.
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Adding the Window Frame: Position the fixed timber window frame within the wall. The dimensions should be included: 150 mm x 80 mm. Indicate the frame’s thickness and detail its structure.
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Concrete Lintels: Above the window frame, illustrate the concrete lintels which are 100 mm x 70 mm in dimension. Make sure to show that they support the window frame and extend over the width of the window opening.
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Dimensions: Clearly mark four typical dimensions, including the height from the bottom of the lintel to the sill, the width of the block wall, the overall height of the window frame, and the depth of the lintel into the wall.
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Additional Details: Include a note to indicate the plaster thickness of 15 mm on either side of the wall and mention any additional remarks regarding thermal insulation, showing the various layers involved.
Step 2
Show clearly on your drawing the flashing (dpc) and the insulation at the window head.
Answer
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Flashing (DPC) Representation: On the top section of the window, illustrate the damp proof course (DPC) clearly. This should be shown as a horizontal band just above the window frame, demonstrating its role in preventing moisture ingress.
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Insulation Layer: Below the DPC, show the insulation layer. Indicate the thermal insulation measure, which is typically about 100 mm thick, and ensure it connects seamlessly with the rest of the structure to maintain energy efficiency.
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Annotations: Label both the flashing and insulation layers on the drawing. Use arrows or lines to clarify their respective locations and functions in the context of the window installation.