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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
To a scale of 1:10, draw a vertical section through the external wall, window and roof structure.
Answer
To create the vertical section, begin by sketching the external wall, ensuring the dimensions are accurate. Represent the 350 mm concrete block wall with a clear distinction of the insulated cavity.
Next, draw the wooden casement window measuring 600 mm in height and 150 mm x 80 mm for the frame. Position it appropriately in the wall.
For the roof structure, depict the prefabricated roof trusses with a pitch of 30 degrees accurately. Ensure the internal span of 6.0 meters is adhered to in the drawing, detailing the structure from the roof down to the wall.
Finally, include four typical dimensions on the roof structure:
- Wallplate size: 100 mm x 75 mm
- Rafter size: 150 mm x 50 mm
- Strut size: 100 mm x 50 mm
- Slating batten size: 50 mm x 30 mm.
Step 2
Indicate clearly on the drawing how the cavity is closed at wallplate level.
Answer
To show how the cavity is closed at the wallplate level, draw a horizontal line representing the wallplate. Indicate that it is placed directly on top of the external wall, ensuring it spans the insulated cavity.
Include a note or arrow showing that the cavity should be filled with insulation material up to the level of the wallplate to prevent thermal bridging. Make sure to illustrate the closure point clearly, emphasizing that it is a sealed connection to maintain insulation integrity.