Share Email Facebook Twitter LinkedIn About Slab and Roof Slab Volume Properties Volumes for slabs and roof slabs do not include the volumes of fascias or soffits. Related Concepts About Wall Area PropertiesAbout Wall Length PropertyAbout Wall Volume PropertiesAbout Door Size PropertiesAbout Door Swing Direction PropertiesAbout Slab and Roof Slab Elevation PropertiesAbout Structural Member PropertiesAbout Understanding Automatic Properties