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Question:

Without loft insulation ,the roof space is full of air.Why does this not keep the heat in?

Without loft insulation ,the roof space is full of air.Why does this not keep the heat in?

Answer:

The warm air that collects in the attic is in close contact with the roof, heat is conducted through the roof and lost to the atmosphere.
Because air can circulate, (it's called convection) and transfer a lot of heat. In other words, air alone is a very poor insulator. .

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