Aluminum foil can be an effective insulating material because it doesn’t radiate heat out into the environment. That’s what makes it effective directly under a roof: although it will warm up through conduction from the shingles, it won’t radiate that heat out into the attic space.

Aluminum foil is used to keep food warm, and soft coolers cold and is even used in housing insulation and space blankets for hikers. But as metal doesn’t this mean it conducts heat well?

Is aluminum foil a good insulator and if so how exactly does it work to stop your food from getting cold or your house from warming up in summer?

In short:

Aluminum foil is a great insulator when used properly and a bad one when used incorrectly. It is a great reflector of thermal heat and also stops evaporation and convection of heat as air/water can’t pass through it. But it conducts heat well so if it is in direct contact with something it won’t insulate well.

Aluminum foil insulation material is the best thermal insulation material at present in the world. It has the advantages of lightweight, low thermal conductivity, good heat resistance, aging resistance, easy combustion with other substrates, bonding does not produce droplet and other excellent properties. On the application, it is widely used in building roofing, wall, ceiling, floor, doors, and windows as insulation materials. The aluminum foil itself is a good conductor of heat, directly used basically has no heat insulation, but accelerates the heat loss, so when used the insulation cotton is wrapped inside the aluminum foil. It has the functions of heat insulation, waterproof, moisture-proof and so on. Its solar radiation absorption coefficient is very low, which can insulate most of the heat transfer.

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