Wall Posted on 27th December 20151st May 2021 by ThePD (The Project Definition) A Wall is a continuous vertical structure that divides or surrounds building. 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 Engineering and tagged architecture, csa. 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.