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A dwelling house has an open-plan kitchen and dining area on the ground floor, as shown - Leaving Cert Construction Studies - Question 1 - 2017
Question 1
A dwelling house has an open-plan kitchen and dining area on the ground floor, as shown. The kitchen has a solid concrete floor with a 20 mm tile finish. The adjoini... show full transcript
Worked Solution & Example Answer:A dwelling house has an open-plan kitchen and dining area on the ground floor, as shown - Leaving Cert Construction Studies - Question 1 - 2017
Step 1
To a scale of 1:10, draw a vertical section through the external wall of the kitchen and through both the concrete and timber floors.
Answer
To draw the vertical section:
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Foundation:
- Start with a foundation slab of 1200 mm x 400 mm.
- Indicate the depth below ground at approximately 1000 mm - 1200 mm.
- Show reinforcement (12 mm mild steel bars at 100 mm centers).
-
Wall:
- Begin with the external wall finish, showing a scud coat and float finish.
- Illustrate the 100 mm concrete block outer leaf and the 200 mm full-fill insulated cavity.
- Include insulation, typically basalt, for heat conductivity.
- Show the low conductivity block liner leaf with a thin plaster/render on the inner side.
-
Floor Details:
- For the concrete floor:
- Show a finished level above the slab with a thickness of 25-35 mm for finishing.
- For the timber floor:
- Illustrate 150 mm x 18 mm skirting, ensuring airtightness.
- Detail the joists (200 mm x 40 mm) at 400 mm centers.
- Represent the timber flooring (20 mm) using tongue and groove.
- For the concrete floor:
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Abutment of Both Floors:
- Clearly show the intersection of the concrete and timber floors, detailing how they meet and transition.
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Dimensioning:
- Ensure to mark a width of 1.5 meters for clarity.
Step 2
On your drawing show the typical design detailing for the cross ventilation of the suspended timber floor through the solid concrete floor.
Answer
To show typical design detailing for cross ventilation:
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Ventilation Gaps:
- Illustrate ventilation openings at the perimeter of the solid concrete floor to allow airflow into the suspended timber floor.
- Define the size of the ventilation openings as typically ranging from 75 mm to 100 mm.
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Airflow Path:
- Draw arrows indicating the direction of airflow through the openings, facilitating the cross ventilation.
- Ensure that the openings are aligned with the timber floor structure above.
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DPC (Damp Proof Course):
- Include details of a DPC layer between the concrete and timber floor to prevent moisture transfer, ensuring it is placed correctly under the concrete.