Rafter Posted on 18th December 201527th May 2022 by ThePD (The Project Definition) A Rafter is the pieces of wood used for ceiling support. Related Definitions in the Project: The Construction Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Construction and tagged architecture, material. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.