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Thermal envelope continuity is essential to ensure a dwelling house is thermal bridge free - Leaving Cert Construction Studies - Question 9 - 2019
Question 9
Thermal envelope continuity is essential to ensure a dwelling house is thermal bridge free. The drawing shows an outline section through the external door of a singl... show full transcript
Worked Solution & Example Answer:Thermal envelope continuity is essential to ensure a dwelling house is thermal bridge free - Leaving Cert Construction Studies - Question 9 - 2019
Step 1
Using notes and freehand sketches, show best practice design detailing that will prevent the formation of a thermal bridge at each location circled on the drawing.
Answer
To prevent thermal bridging at the specified locations, consider the following best practices:
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External Wall Intersection: Indicate a continuous insulated layer that wraps around the corner where the external door meets the wall. This should include a thermal break detail that ensures there is no direct contact between the cold masonry and the warm interior surfaces. Use appropriate insulation materials that overlap and guarantee continuity.
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Door Frame Detail: Sketch the door frame insulated with a thermal break material. The frame should be designed to avoid metal-to-metal connections that would transmit cold. Ensure that the frame is not directly connected to the block wall, but instead has an insulating interface to break thermal continuity.
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Foundation Connection: Represent a design where the concrete floor slab is separated from the external wall with insulation under the slab. This detail helps to prevent cold feet and other thermal losses from the ground, ensuring a warm interface between the indoor environment and the external ground.
Use clear labels and dimensions in sketches to ensure clarity in the thermal bridge prevention design.
Step 2
Discuss two negative impacts of thermal bridging as a result of poor design detailing.
Answer
Thermal bridging can have significant negative impacts, including:
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Increased Energy Costs: When thermal bridging occurs, it leads to heat loss through the thermal bridge areas. This means that the heating system has to work harder to maintain comfortable indoor temperatures, which results in higher energy consumption and costs.
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Mould Growth and Health Issues: The presence of thermal bridges can create conditions for moisture accumulation. When warm, humid air hits the colder surfaces, condensation can form, leading to mould growth. This not only can deteriorate building materials but poses a health risk to occupants through airborne spores and allergens, negatively impacting indoor air quality.