Can aluminum sheets be used for wall insulation in new buildings?

Aluminum sheets themselves are not typically used for wall insulation due to their poor insulating properties. Aluminum is a good conductor of heat, which makes it unsuitable for insulation as it can transfer heat easily, leading to energy loss. However, aluminum can be used as a vapor barrier or as part of a composite material in combination with proper insulation. For effective insulation, materials with low thermal conductivity like fiberglass, cellulose, or foam are commonly used.