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Check whether your roof needs insulation
Suitable insulation can reduce heat transfer through the roof.
What changes the result
The result depends on the existing building, climate and heating or cooling system.
Plan for a replacement or renovation. Check suitability, permission and local advice before buying.
References in the original project +
Energy Star (2023); ORNL (2019); US DOE (2023)
These bibliographic references come from the original cards. They provide context; they do not validate every numerical assumption below.
