Photo AI
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 ... 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
Using notes and freehand sketches show how the inner leaf is to be insulated. Specify the type and thickness of insulation.
Answer
To insulate the inner leaf of the wall, the following steps should be undertaken:
- Placement of Insulation: The insulation is placed in the cavity space between the structural studs. This is critical in preventing cold bridges and ensuring thermal efficiency.
- Breather Membrane: Fit a breathable membrane to allow moisture to escape while preventing water ingress. This is crucial for damp-proofing.
- Airtightness/Vapour Barrier: An airtightness or vapour barrier should be fitted on the warm side of the insulation to improve thermal performance.
- Insulated Plasterboard: Finally, insulated plasterboard is fixed to the timber studs, completing the insulation process.
Type of Insulation: Suitable insulation materials include blown cellulose insulation, sheep wool, fiberglass, and expanded polystyrene.
- Thickness of Insulation: The insulation thickness should be at least 200mm to ensure effective thermal performance.
Step 2
List two advantages of insulating the inner leaf of the external wall.
Answer
- Energy Efficiency: Insulating the inner leaf reduces heat loss significantly, leading to lower energy bills over time and a more comfortable living space.
- Improved Thermal Comfort: Enhanced insulation keeps the home warmer, ensuring a stable internal temperature and contributing to thermal comfort for occupants.
Step 3
On a separate sketch, show one method of providing a surface finish to the plasterboard prior to painting.
Answer
One method for finishing plasterboard before painting includes:
- Sanding: Lightly sand the joints and screw heads using fine-grit sandpaper to create a smooth surface.
- Applying Joint Compound: Use a joint compound to fill any gaps or imperfections in the surface. This helps ensure a flawless finish before painting.
- Priming: Apply a coat of primer to seal the plasterboard and enhance paint adhesion.