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A suspended timber ground floor abuts a 300 mm concrete block external wall of a dwelling house - Leaving Cert Construction Studies - Question 4 - 2007
Question 4
A suspended timber ground floor abuts a 300 mm concrete block external wall of a dwelling house. (a) Using notes and freehand sketches show the construction details... show full transcript
Worked Solution & Example Answer:A suspended timber ground floor abuts a 300 mm concrete block external wall of a dwelling house - Leaving Cert Construction Studies - Question 4 - 2007
Step 1
Using notes and freehand sketches show the construction details of the wall and the suspended timber ground floor from foundation to finished floor level.
Answer
To address this part, you should create detailed sketches illustrating the following aspects:
- Concrete Block Wall: Draw a 300 mm thick concrete block wall.
- Foundation: Show the foundation extending below ground level, ensuring to depict the depth and dimensions adequately.
- Floor Components: Indicate the suspended timber ground floor, which includes:
- Joists: Sized in accordance with IS 444, showing their position and spacing.
- Radon Barrier: Clearly mark its position within the construction. It typically would be a continuous layer of an impervious material placed above the foundation.
- Insulation: Describe the required insulation thickness and the materials used, like rigid insulation, ensuring the configuration allows for air to ventilate across the cavity.
- Underlining Layers: Indicate the quality of materials used, such as battens, which support joists, and verify whether they need additional structural support.
- Air Vents: Show air vents for ventilation purposes running across the timber floor. Include notes that explain these features and dimensions for complete clarity.
Step 2
Discuss in detail two functional requirements of a suspended timber ground floor for a domestic dwelling.
Answer
There are several functional requirements for a suspended timber ground floor, but two key requirements include:
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Resistance to Dampness: It is essential to prevent the passage of dampness, which can occur due to moisture rising from the ground through capillary action. To achieve this, a continuous layer of a Damp Proof Membrane (DPM) should be installed within the structure to inhibit moisture infiltration. Properly placed, this layer ensures the longevity of the floor components and avoids damage.
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Thermal Protection: Another vital requirement is to provide adequate thermal insulation to minimize heat loss. The heat emanating through the floor can lead to increased energy costs and discomfort. Using insulation materials brings about improved energy efficiency, especially when the whole floor area is covered with insulated layers. This protects the inhabitants from cold drafts and maintains a comfortable internal temperature.