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The sketch shows a single storey extension to a dwelling house - Leaving Cert Construction Studies - Question 2 - 2014
Question 2
The sketch shows a single storey extension to a dwelling house. The external wall of the extension is a single leaf, 215 mm solid concrete block wall. The wall has a... show full transcript
Worked Solution & Example Answer:The sketch shows a single storey extension to a dwelling house - Leaving Cert Construction Studies - Question 2 - 2014
Step 1
Using notes and freehand sketches show one method of fixing the insulation to the solid block wall of the extension. Specify the insulation material to be used.
Answer
One effective method for fixing insulation to the solid block wall is to use a stainless steel track. The process involves several steps:
- Attach Base Stainless Steel Track: Fix the track to the wall at DPC (Damp Proof Course) level.
- Insulation Boards Placement: Lay the first row of insulation boards in place, ensuring a secure fit.
- Adhesive Application: Use a special adhesive to hold the boards in position, ensuring that they rest steadily.
- Subsequent Rows Fitting: Fit each subsequent row of insulation boards, ensuring all rows are fixed in place.
- Mechanical Fixings: Use mechanical fixings to secure each board further, typically spacing them at about one fix per square meter.
- Drilling Fixings: Drill through the insulation into the wall and hammer fixings into place.
- Insulation Material: Recommended materials include polystyrene, mineral fiber board, and phenolic foam.
Step 2
Using notes and freehand sketches show the steps involved in applying a reinforced mesh and an external surface finish to the insulation.
Answer
The steps to apply a reinforced mesh and external surface finish are as follows:
- Initial Fixing: Begin with fixing the base coat using a suitable adhesive or bonding agent.
- Applying Base Coat: Apply a base coat of acrylic plaster to the surface of the insulation.
- Incorporate Mesh: While the base coat is still wet, apply a reinforced mesh to strengthen the finish.
- Additional Base Coat: Over the mesh, apply an additional base coat ensuring full coverage.
- Final Finish: Apply the final surface finish using a trowel, creating a smooth appearance.
- Check for Flaws: Inspect the surface to ensure there are no defects like cracks or bumps.
- Curing: Allow sufficient curing time before applying any top coat or paint.
Step 3
List two advantages of improving the insulation properties of the external wall of the extension.
Answer
- Energy Efficiency: Enhancing insulation minimizes heat loss, which significantly reduces energy bills during colder months.
- Environmental Impact: Improved insulation leads to lower CO2 emissions, making the building more environmentally friendly and sustainable.