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A traditional strip foundation supports the external wall of a dwelling house, as shown in the sketch - Leaving Cert Construction Studies - Question 5 - 2015
Question 5
A traditional strip foundation supports the external wall of a dwelling house, as shown in the sketch. The external wall is of timber-frame construction, with a 100... show full transcript
Worked Solution & Example Answer:A traditional strip foundation supports the external wall of a dwelling house, as shown in the sketch - Leaving Cert Construction Studies - Question 5 - 2015
Step 1
(a) To a scale of 1:5, draw a vertical section through the foundation, external wall and ground floor.
Answer
To create a vertical section at a scale of 1:5, begin by illustrating the foundation details:
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Foundation Base: Start with a reinforced concrete slab measuring 200 mm in depth that lays on a bed of hardcore fill.
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Damp Proof Course (DPC): Include a DPC layer above the foundation to prevent moisture from rising.
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Cavity Wall: Illustrate the external wall structure consisting of:
- A 100 mm concrete block outer leaf.
- A 50 mm ventilated cavity.
- A 200 mm insulated timber-frame inner leaf.
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Vapor Barrier: Place a vapor diffusion membrane within the inner leaf.
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Racking Board: Add an oriented strand board (OSB) layer positioned against the insulation.
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Finishes: Incorporate a 12.5 mm plasterboard with a skim finish on the internal wall surface as well as the skirting board at the floor level.
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Radon Barrier: Ensure to indicate the radon barrier below the insulation layer above the DPC.
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Dimensions: Include relevant dimensions to ensure clarity, such as 200 mm for the ground floor slab, 50 mm for the cavity, and overall heights where specified.
Ensure that each part is drawn proportionally to maintain the 1:5 scale.
Step 2
(b) On your drawing, show clearly the position of the insulation in the wall and in the floor.
Answer
In the drawing:
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Insulation in the Wall:
- Show the insulation located within the 200 mm timber-frame inner leaf. This should be clearly indicated as being integral to the wall structure, ensuring proper insulation coverage.
- Emphasize the position of the insulation layer, which should extend fully from the bottom plate to the top of the wall framing.
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Insulation in the Floor:
- Illustrate rigid insulation positioned beneath the 200 mm reinforced concrete slab. Ensure the insulation layer is clearly marked, showcasing its thickness (e.g., between 200 mm to 300 mm).
- The insulation should extend directly under the entire area of the ground floor to enhance thermal efficiency.