Attics
Walls
Crawlspaces
Basements (Unfinished)
Vented Roof Deck : Total square footage = Flat Attic Floor, Length x Width
Walls : Total square footage = Length x Height - Window/Door Square Footage
Crawl Space (Conditioned or Vented) : Total square footage = Floor Area, Length x Width
Basement Ceiling : Total square footage = Floor Area, Length x Width