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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 adjoin... 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
(a) 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 effectively draw the vertical section, follow these steps:
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Foundation Detail: Begin with the strip foundation, which is typically 1200 mm x 400 mm. Indicate a depth of 1000 mm to 1200 mm below ground level, with construction details such as solid blockwork to ground level.
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Concrete Floor Detail: Represent the solid concrete floor with a thickness of 200 mm, finished with a tile layer. Show the insulation beneath the concrete, typically around 200 mm.
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Timber Floor Detail: Illustrate the suspended timber floor. The 20 mm tongue and groove hardwood should be shown laid over 200 mm × 40 mm joists, positioned at 400 mm centers.
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Cavity Wall: For the external wall, draw a 400 mm concrete block with a full-fill insulated cavity. Indicate both the external plaster finish and the internal finishes, including the cement and plaster render.
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Dimensioning: Ensure the drawing includes appropriate dimensions, showing 1.5 metres for the width of each floor as specified.
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Abutment Details: Clearly show where the two floors abut, providing clarity on the structural layout.
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Skirting and Air Tightness: Add details about the skirting boards and mention any measures taken for airtightness at the junction of the floors.
Step 2
(b) On your drawing show the typical design detailing for the cross ventilation of the suspended timber floor through the solid concrete floor.
Answer
For detailing the cross ventilation:
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Ventilation Design: Integrate air vents in the solid concrete floor to allow airflow into the suspended timber floor area. Indicate the position of vents, typically located on opposing walls.
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Vent Size: Show small openings, around 75 mm to 100 mm in diameter, ensuring they are adequately spaced to promote ventilation across the entire area of the timber floor.
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Protection from Moisture: Illustrate measures to prevent moisture ingress, such as damp-proof membranes or breathable membranes where required.
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Access Points: Detail access points to the ventilation system for maintenance.
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Flow Path Indication: Clearly represent airflow paths, indicating that air can enter through the slots in the concrete and circulate beneath the timber floor for effective ventilation.