Many home owners are unfamiliar with the concepts "fascia" and "soffit," but they're vital components of your roofing structure. The board is the wide piece of material that runs along the lower edge of your roofline, https://medium.com/@metalprofilesltduk/essential-fascias-and-soffits-maintenance-tips-for-a-longer-lasting-roofline-293b0ab68e32