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Poor design detailing or workmanship can result in the formation of thermal (cold) bridges, causing significant heat loss through the external fabric of a building - Leaving Cert Construction Studies - Question 3 - 2008
Question 3
Poor design detailing or workmanship can result in the formation of thermal (cold) bridges, causing significant heat loss through the external fabric of a building. ... show full transcript
Worked Solution & Example Answer:Poor design detailing or workmanship can result in the formation of thermal (cold) bridges, causing significant heat loss through the external fabric of a building - Leaving Cert Construction Studies - Question 3 - 2008
Step 1
Outline three areas in a dwelling house where thermal bridges are likely to occur
Answer
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Openings in External Cavity Wall:
- Locations: Head, cill, and jamb around windows and doors can create unwanted thermal bridges.
- Design Detail: Use insulated frames and ensure appropriate sealing and insulation around all joints to minimize heat loss.
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Gaps in Insulation in Floors:
- Locations: Around beams and joists where insulation may not reach effectively.
- Design Detail: Install continuous insulation that overlaps and fills gaps, ensuring seamless thermal continuity within the flooring system.
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Service Ducts Through Ceiling:
- Locations: Where heating or plumbing ducts pass through insulated ceilings.
- Design Detail: Encapsulate ducts with insulation material and seal any junctions to prevent heat loss through these areas.
Step 2
Using notes and freehand sketches, show the correct design detailing which will prevent the formation of thermal bridges in each location outlined.
Answer
Sketches should illustrate:
- Insulated Window Detail:
- Detail sketch showing properly insulated window frames with caulking to eliminate drafts.
- Continuous Floor Insulation:
- Diagram depicting the layout of insulation around joists and beams, depicting overlaps and fitting.
- Encapsulated Duct System:
- Illustration displaying the encapsulation of ducts with insulation, highlighting seals at junctions.
Each sketch should be labeled clearly to indicate the preventive measures against thermal bridging.
Step 3
Show two methods of upgrading the thermal properties of the external envelope
Answer
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Externally Fixed Insulation Method:
- Apply rigid phenolic insulation with a tissue-based facing on both sides, mechanically fixed to the external leaf of the wall. Use a polymer modified render to protect the insulation from moisture and UV light.
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Dry-Lining Method:
- Utilize 12.5 mm plasterboard bonded to rigid phenolic insulation. Mechanically fix the insulation to timber battens, ensuring optimal thermal performance and a smooth finished surface.