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The elevation and ground floor plan of an Irish vernacular cottage, which has been retrofitted and extended, are shown - Leaving Cert Construction Studies - Question 6 - 2020
Question 6
The elevation and ground floor plan of an Irish vernacular cottage, which has been retrofitted and extended, are shown. The existing cottage has been upgraded to mee... show full transcript
Worked Solution & Example Answer:The elevation and ground floor plan of an Irish vernacular cottage, which has been retrofitted and extended, are shown - Leaving Cert Construction Studies - Question 6 - 2020
Step 1
Discuss two advantages and two disadvantages of retrofitting the vernacular cottage shown.
Answer
Advantages of Retrofitting:
- Ethical Responsibility: Retrofitting the cottage allows for the preservation of Ireland's natural heritage and vernacular architecture. By updating older buildings, we maintain cultural identity while enhancing functionality.
- Reduced Environmental Impact: The embodied energy and carbon footprint associated with constructing a new building is avoided since the existing structure is reused. This reduces waste and environmental pollution.
Disadvantages of Retrofitting:
- Extent of Renovations: Often, the extent of renovations required becomes apparent only after investigating the old building, leading to unforeseen costs.
- Material Limitations: Careful selection of materials is needed to avoid issues with dampness and insulation, which can be more challenging in older buildings.
Step 2
With reference to the design shown, discuss using notes and freehand sketches, three features of the design that contribute to the house having a low environmental impact.
Answer
1. Large Windows Facing South:
The design incorporates large windows on the south facade, allowing ample sunlight to enter the house. This captures solar heat gains during winter months, helping to maintain internal temperatures and reducing reliance on heating systems.
2. Simple Building Form:
The extension is designed with a simple building form (one room deep), which minimizes energy loss through external walls. This efficient layout helps to maintain thermal comfort with less energy consumption.
3. Sustainable Insulation:
The use of high-quality insulation reduces energy loss significantly. This layered insulation also minimizes air leaks, ensuring that heating and cooling systems operate more efficiently, ultimately lowering energy usage.
Step 3
Discuss in detail, using notes and freehand sketches, two modifications to the house shown that would further reduce the environmental impact of the house. Justify your design choices.
Answer
Modification 1: Install Evacuated Tube Solar Panels
By installing solar panels on the south-facing roof, the house can harness solar energy for domestic hot water heating. This effectively reduces energy bills and the carbon footprint as it utilizes the renewable energy of the sun.
Modification 2: Create a Draught Lobby
Designing a draught lobby at the entrance would minimize air movement and heat loss when the door is opened. By reducing large areas of heat loss, this modification improves the overall thermal performance of the house while enhancing occupant comfort.