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The sketch shows portion of an external wall, roof and a window of a dwelling house - Leaving Cert Construction Studies - Question 1 - 2010
Question 1
The sketch shows portion of an external wall, roof and a window of a dwelling house. The external wall is a 350 mm concrete block wall with an insulated cavity. The ... show full transcript
Worked Solution & Example Answer:The sketch shows portion of an external wall, roof and a window of a dwelling house - Leaving Cert Construction Studies - Question 1 - 2010
Step 1
Draw a vertical section through the external wall, window and roof structure
Answer
To create a vertical section at a scale of 1:10, start by sketching the external wall with dimensions indicating a 350 mm concrete block with an insulated cavity. Then, include the window frame, which measures 150 mm x 80 mm. Below the concrete cill level, detail the window's structural support and ensure to also depict the insulated cavity behind the wall. Draw the roof structure using prefabricated trussed rafters at a 30-degree pitch, extending the rafters and ceiling detail. Include typical roof dimensions such as:
- Wallplate: 100 mm x 75 mm
- Rafter: 150 mm x 50 mm
- Ceiling: 150 mm x 50 mm
- Strut: 100 mm x 50 mm
Conclude this section by marking the height of the window at 600 mm.
Step 2
Indicate clearly how the cavity is closed at wallplate level
Answer
To show how the cavity is closed at wallplate level, detail the junction where the wall meets the roof structure. Include a closure block or a cavity tray above the wallplate to ensure moisture is directed outward. Indicate the termination of the insulation at this point and the use of appropriate flashing to prevent water ingress, ensuring proper sealing within this junction to maintain the integrity of the insulated cavity.