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The proposed external wall for a new house has a 100 mm concrete block outer leaf, a 200 mm cavity and a 100 mm concrete block inner leaf as shown - Leaving Cert Construction Studies - Question 2 - 2020
Question 2
The proposed external wall for a new house has a 100 mm concrete block outer leaf, a 200 mm cavity and a 100 mm concrete block inner leaf as shown. (a) Using notes ... show full transcript
Worked Solution & Example Answer:The proposed external wall for a new house has a 100 mm concrete block outer leaf, a 200 mm cavity and a 100 mm concrete block inner leaf as shown - Leaving Cert Construction Studies - Question 2 - 2020
Step 1
Using notes and freehand sketches, show one suitable method of insulating the proposed cavity. Specify the type and thickness of insulation.
Answer
To insulate the proposed cavity wall, builders can use rigid insulation boards.
Method
- Installation of Insulation Boards: Builders will erect the insulation boards in the cavity wall, ensuring they are installed snugly.
- Cavity Wall Tie: A cavity wall tie will be used to keep the insulation boards in place against the internal block wall. This ensures stability.
Type of Insulation
- Expanded Polystyrene (EPS) boards: These are commonly used due to their excellent thermal properties.
Thickness of Insulation
- Full-Filled Cavity Insulation: A thickness of 200 mm is recommended for optimal insulation performance.
Step 2
List two advantages of installing insulation in the cavity.
Answer
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Energy Efficiency: Insulation reduces the heat loss in the building, which leads to lower energy bills for heating.
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Comfort for Occupants: Proper insulation maintains a more constant and comfortable indoor temperature, reducing drafts and improving living conditions.
Step 3
On a separate sketch show, using notes and freehand sketches, one method of providing additional insulation to this wall to further improve its thermal insulation properties.
Answer
One method of providing additional insulation is to install external insulation panels.
External Insulation Method
- Attachment: Insulation panels are fixed to the exterior walls using appropriate fixings (e.g., adhesive) to ensure durability.
- Thickness: A minimum thickness of 200 mm is recommended to enhance thermal performance.
- Surface Finish: The surface of the insulation is finished with a base coat of acrylic (e) and is reinforced with a mesh reinforcement (d).