The formwork must withstand all loads—dead, live, and environmental.
: Dedicated sections for architectural concrete, mass concrete, tunnels, and bridge structures. American Concrete Institute Accessing the Document
In multi-story concrete buildings, the weight of freshly poured floors is often heavier than what the lower, partially cured floors can safely support. SP-4 provides critical guidelines on:
The manual provides comprehensive guidelines for designing, erecting, and using formwork to achieve three primary objectives:
Balancing materials, labor, and reusability to keep project costs under control. Key Structural Sections of the Manual
The most referenced chapter in the book. It covers:
Helps optimize material usage and reduce construction time.
⚠️ Be cautious of free PDFs online — many are outdated drafts or contain errors. Always use the official ACI SP-4 (current edition: usually updated every 5–7 years).
While the PDF is searchable, many engineers print the following tables and laminate them for field use: