If you’ve ever walked a site and wondered why the ceilings feel lower, the answer is often plumbing. Waste lines need slope. Vents need clear vertical runs. Domestic hot and cold water risers fight for the same shafts as electrical and HVAC. In other words: plumbing drawings and riser diagrams quietly govern spatial decisions long before steel is erected. In a Building Information Mod... https://bmsi.ai/plumbing-drawing-riser-diagram-the-hidden-backbone-of-bim/