Insulating a house

• Roof - Fibre glass insulation ( reduces convection and conduction )
• Windows - Double glazing ( conduction - air gap inbetween glass )
• What affects how much heat is lost through walls?

  Thermal conductivity and the thickness of walls
• Walls - Cavity fibre glass ( gap between walls filled with insulating fibre glass contains trapped air which cannot move so no convection )
• Door - UPVC ( poor conductor )
• floor - Carpet and underlay ( poor conductor )
• humble draught excluder - prevents droughts caused by convection
• Payback time - how long you have to wait to save back money on your energy bills compared to how much it cost to buy
• payback time = cost of insulation/ energy bill savings
• The sooner the insulation pays for itself, the more cost effective it is