Lecture 5 - Thermal Bridges

Question 1

Why is thermal bridge free design so important?

Answer 1

Because:

1. Thermal bridges reduce thermal comfort
2. Thermal bridges affect occupants’ health
3. Thermal bridges cause higher energy consumption
4. Thermal bridges affect the durability of building elements

Question 2

Define thermal bridges

Answer 2

Localised areas of low thermal resistance resulting in disproportionate heat loss

Question 3

What are the factors of rate of heat flow through thermal bridges?

Answer 3

1. Temperature difference across the thermal bridge
2. Thermal conductivity of the materials
3. Cross-sectional area of the thermal bridge

Question 4

What are the two types of thermal bridges?

Answer 4

Geometrical thermal bridges

Material thermal bridges

Question 5

What are the consequences of thermal bridges?

Answer 5

1. Discomfort
2. Greater energy consumption due to poor insulation
3. Condensation on cold surfaces that leads to decay of building elements
4. Risk of mould

Question 6

How do you reduce thermal bridges?

Answer 6

1. Suitable insulation material at the source of thermal bridges
2. Aligning the window with the thermal envelope
3. Ventilating the roof