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The external wall of a new house has a 100 mm concrete block outer leaf, a cavity and a 200 mm inner leaf of timber frame construction, as shown - Leaving Cert Construction Studies - Question 2 - 2017
Question 2
The external wall of a new house has a 100 mm concrete block outer leaf, a cavity and a 200 mm inner leaf of timber frame construction, as shown. The inner leaf is i... show full transcript
Worked Solution & Example Answer:The external wall of a new house has a 100 mm concrete block outer leaf, a cavity and a 200 mm inner leaf of timber frame construction, as shown - Leaving Cert Construction Studies - Question 2 - 2017
Step 1
How the inner leaf is to be insulated
Answer
To insulate the inner leaf of the wall, the following steps can be taken:
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Placement of Insulation: Insulation is placed in the space between the uprights (timber studs).
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Structural Sheeting Board: Structural sheeting board B is fixed to the uprights, providing rigidity to the frame.
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Breather Membrane: A breather membrane is fitted to allow moisture to escape, while preventing the ingress of water.
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Cavity and Ventilation: The cavity and external leaf is designed to be formed to ensure proper ventilation.
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Airtightness/Vapour Barrier: Ensure that an airtightness/vapour barrier is fitted on the warm side of the insulation to prevent condensation.
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Insulated Plasterboard: Insulated plasterboard A is then affixed to the interior, providing warmth and a suitable surface for finishing.
Step 2
Type of insulation
Answer
There are several types of insulation which can be used for the inner leaf:
- Blown cellulose insulation.
- Sheep wool, fiberglass, woodfiber, cork board, rockwool.
- Mineral fibre bats – rockwool, Gutex insulation.
- Expanded polystyrene – bats fitted between joists.
- Spray foam insulation – water- or polyurethane-based insulation.
Step 3
Step 4
List two advantages of insulating the inner leaf of the external wall
Answer
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Insulation reduces heat loss: This is critical in maintaining a comfortable indoor temperature and reducing energy costs.
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Thermal insulation will keep heat in your home: This helps to provide a comfortable living environment, reduces reliance on heating systems, and ultimately leads to lower energy bills.
Step 5
Show one method of providing a surface finish to the plasterboard prior to painting
Answer
One common method of finishing plasterboard is to apply a joint compound (often called 'mud') to fill in joints and screw holes. Once dried, the surface can be sanded smooth for a clean finish. Following this, the surface can be primed and painted. A sketch accompanying this method would typically illustrate the application of the joint compound and sanding process.