Experience with Designing Robust Building Systems Plus Question on Fire and Moisture Protection

I am engineering student and I work also in small architectural consulting project. I often read here for many topics like structural design, HVAC selection, and material performance because this forum have many smart and practical replies. I see many discussion about corrosion prevention, moisture problem in buildings, insulation, and sustainable design. It is very helpful because real world building systems need good solution for environment and long life use.

Right now I working on a project for a renovation of an older industrial building. I have question about how to best protect interior surfaces from water ingress and also manage fire safety in wall and floor assemblies. The building is concrete and steel frame, and I try to choose systems that are robust but not too complex. I am reading codes and product datasheets, but I still want experienced opinion: what are good engineering practices for interior waterproofing and fire stopping details, especially around penetrations and junctions? Many products show good performance in lab, but field condition and installation quality matter a lot for long life. CR4 Also from my small business I must prepare estimate for labor and materials, including interior waterproofing fire stopping estimating as separate line items in project budget. Sometimes this help client understand cost drivers and choose better solution early. If someone have template or suggestion how to estimate these protective systems accurately, I appreciate your experience. Thanks in advance for any tips on detailing, product selection, and estimation approach!