insulating the home

Question 1

What is in common with all insulation

Answer 1

•All insulation contains trapped air.
Air is a good insulator.
• All insulation reduces heat loss by conduction.

Question 2

What’s different about cavity wall

Answer 2

Cavity wall also reduces heat loss by convection.

Question 3

How does double glazing work

Answer 3

• The gap between the 2 layers of glass contains trapped air.
•Air is a good insulator so this reduces heat transfer by conduction.

Question 4

How does Draught excluders work

Answer 4

•The gap around the edges of the doors can let heat escape.
•Draught excluders contain material with lots of pockets of trapped air that stop heat loss by conduction

Question 5

How does loft insulation (fibre glass) work

Answer 5

•The insulation (fibre glass) contains trapped air
• Air is a good insulator so this reduces heat transfer by conduction.

Question 6

how does Cavity wall insulation work

Answer 6

•The gap between the inside and outside layers of brick in a house is filled with foam.
•The foam is a good insulator reducing heat loss by conduction
• The foam also stops air moving in the gap to reduce heat loss by convection.

Question 7

How does floor insulation work

Answer 7

•Placing carpets on the floor reduces heat loss by conduction.
•You can also place polystyrene tiles on the floor - this contains trapped air which is a good insulator.

Question 8

why does trapped air stop heat loss by conduction

Answer 8

because warm air cannot rise and cold air cannot fall

Question 9

Benefits of insulating homes

Answer 9

• Energy bills are reduced
• Carbon dioxide emissions are reduced- causes global warming