Jobsite Safety, Fall Protection, and Code Requirements
Fall protection rules that get tested
Federal OSHA 1926.501 sets a 6-foot trigger for construction work: at or above six feet, employees need fall protection. On steep roofs, meaning those steeper than 4:12, the acceptable systems are guardrail systems with toeboards, safety net systems, or personal fall arrest systems - warning lines and safety monitors, which are permitted on low-slope roofs, are not an option on a steep roof. A personal fall arrest system uses a full-body harness, lanyard, and anchor rated at 5,000 pounds per employee attached, rigged so free fall cannot exceed six feet.
Clearance arithmetic
Learn the fall-distance calculation: six feet of free fall plus 3.5 feet of deceleration plus one foot of harness stretch plus a two-foot safety margin lands you at roughly 12.5 feet below the anchor point, and the drop from anchor to D-ring must be added when the anchor is below shoulder height. Swing-fall hazards must be addressed by keeping the anchor near the work.
Other site hazards
Ladders at a 4:1 angle, extending 3 feet above the landing, rated for the load, and kept 10 feet from energized power lines. Openings and skylights are covered, secured, and marked. Guardrails sit at 42 inches (plus or minus 3 inches) with toeboards. Nail guns are never bumped or horseplayed with, eye protection and cut-resistant gloves are worn, and heat illness prevention matters on summer tear-offs.
Code overlay
IRC Chapter 9 (or the local equivalent) governs roof assemblies, materials, ventilation, and minimum slope; manufacturer installation instructions are incorporated by reference, so ignoring them is a code violation, not merely a warranty issue. Attic ventilation is typically 1/150 of the attic floor area, or 1/300 when intake and exhaust balance and a vapor retarder is present. Illinois has no single statewide building code for private construction; jurisdictions adopt the IBC/IRC with local amendments, and Chicago enforces its own code.
Rule of thumb
Steep roof, no monitor. If the pitch exceeds 4:12 and the drop is six feet or more, the crew is in harnesses or the job does not start.