A To Z Renovations All aluminum & vinyl soffit or fascia is generally set up in excess of a stable foundation like plywood-extra is required for prefabrication. Counter flashing can be mounted Anytime in excess of present action or chimney flashing and will be colour coordinated to the homes exterior. https://www.diigo.com/item/note/az7m5/tban?k=f5cf5a0965cd94798453ca7183dbdad6