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A roof insulates a house from gaining radiated heat from the sun by shading it, and if air is allowed to circulate under the roof this helps to reduce the amount of heat transmitted from the roof as it heats up.

A roof insulates a house from losing heat from the inside of the house by reducing the air circulation over the ceiling as the air that flows past will take away heat with it.

The roof itself does not usually provide the main insulation. Usually specific insulating materials are added just above the ceiling. These either trap air in a great many very small pockets reducing the opportunity for air flow and circulation (which would allow heat loss through convection and conduction), and are made of materials that minimize conduction, or are reflective to minimize heat loss through radiation.

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15y ago
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11y ago

Usually nonmetals. Rubber, plastic, wood, cloth, paper, Styrofoam, tinfoil (to reflect the heat.)

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Q: How does a roof insulate a house?
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