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Thermal insulation is used to reduce heat loss through the external walls of a dwelling house - Leaving Cert Construction Studies - Question 6 - 2008
Question 6
Thermal insulation is used to reduce heat loss through the external walls of a dwelling house. (a) Using notes and neat freehand sketches, show the location of a ri... show full transcript
Worked Solution & Example Answer:Thermal insulation is used to reduce heat loss through the external walls of a dwelling house - Leaving Cert Construction Studies - Question 6 - 2008
Step 1
Rigid insulation board in the cavity of an external wall of concrete block construction
Answer
In an external wall of concrete block construction, the rigid insulation board is positioned against the inner face of the cavity wall. The insulation reduces heat loss by creating a barrier against the external environment.
- Residual Cavity: The remaining cavity after the insulation board is installed is typically 40 mm.
- Typical Thickness of Insulation: The standard thickness of the insulation board used in this scenario is 60 mm.
(Include a sketch to illustrate the placement of the insulation board.)
Step 2
Show how the insulation board is held in place in the cavity
Answer
The insulation board is secured within the cavity using specially designed steel ties:
- The ties anchor the board tight against the wall to ensure stability and effectiveness.
- The wall ties provide structural support, holding the insulation board in place firmly.
- Insulation boards can also be joined together using a tongue and groove system for added integrity.
(Include a sketch of the fastening method with ties and grooved edges.)
Step 3
Another method of insulating the external walls
Answer
An alternative insulation method involves the use of dry lining:
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Dry Lining: This method can be fitted to the inner face of the external walls.
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The dry lining consists of treated softwood battens sized 50 x 25 mm, installed with insulation placed in between.
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Plasterboard of 12 mm thickness is applied to these battens, offering additional insulation.
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Alternatively, special insulation can be pumped into the cavity of existing walls to enhance thermal performance.
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Insulation can also be added externally to the outer surfaces of the walls, further improving thermal efficiency.
(Include a sketch demonstrating the dry lining technique and external insulation options.)