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Discuss in detail, using notes and freehand sketches, three functional requirements of a roof suitable for a domestic dwelling house - Leaving Cert Construction Studies - Question 2 - 2019
Question 2
Discuss in detail, using notes and freehand sketches, three functional requirements of a roof suitable for a domestic dwelling house. The owners of a house located ... show full transcript
Worked Solution & Example Answer:Discuss in detail, using notes and freehand sketches, three functional requirements of a roof suitable for a domestic dwelling house - Leaving Cert Construction Studies - Question 2 - 2019
Step 1
Functional requirements of a roof suitable for a domestic house
Answer
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Weather Resistance: The roof must be designed to protect against all external elements including rain, snow, and sun. This involves using materials that can withstand these conditions effectively.
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Structural Stability: The roof structure should be capable of supporting all imposed loads (dead and live) and resist lateral movement of the roof. A thorough analysis of load-bearing capabilities is essential.
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Thermal Insulation: The roof should provide a high level of thermal comfort for the occupants by retaining heat during winter and preventing excessive heat gain in summer. Good insulation materials like fiberglass or foam should be used.
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Durability: The roofing materials selected should be long-lasting and require minimal maintenance. This is important for reducing future repair costs and ensuring longevity.
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Ventilation: Adequate ventilation is necessary to prevent condensation buildup and maintain air quality. Proper vent placements and ridge vents will help achieve this.
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Airtightness: The roof's design must ensure that it maintains an airtight layer in the building to maximize energy efficiency.
Step 2
Using notes and freehand sketches, show the design for three different, distinct roof profiles suitable for the proposed extension
Answer
Roof Profile Designs
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Gable Roof: A classic design featuring two sloping sides which meet at a ridge. This profile is efficient for drainage and allows good ventilation. It can also provide extra space in the attic.
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Flat Roof: Ideal for modern designs, this type minimizes material costs and offers a usable space on top for gardens or storage. However, it requires careful drainage management to prevent water pooling.
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Hip Roof: This has slopes on all four sides, providing greater wind resistance and stability. It offers more structural integrity and extends the living space, but may require more materials and construction skill.
Step 3
Recommend a preferred roof profile for the proposed extension and justify your recommendation
Answer
Recommended Roof Profile
Preferred Roof Profile: Gable Roof
The gable roof is recommended for the proposed extension due to its effective drainage capabilities, ease of construction, and aesthetic appeal. It allows for proper ventilation to reduce heat accumulation and moisture retention, which is crucial for maintaining a pleasant indoor environment. Additionally, the design facilitates future expansion or modifications if needed.
Step 4
Select a different roofing material for each roof type you have shown at 2(b). Give one advantage and one disadvantage for each material selected
Answer
Roofing Materials and Considerations
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Gable Roof - Material: Cedar Shingles
- Advantage: Natural aesthetic appeal and excellent insulation properties.
- Disadvantage: Higher maintenance requirements to prevent rot and insect infestation.
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Flat Roof - Material: Single-Ply Membrane (EPDM Rubber)
- Advantage: Durable and has excellent waterproofing properties.
- Disadvantage: Can be prone to punctures and damage from foot traffic.
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Hip Roof - Material: Clay Tiles
- Advantage: Long-lasting and energy-efficient due to natural thermal properties.
- Disadvantage: Heavier than other materials, requiring a stronger structural support.