Ladder Placement Angle

Base distance for the 4:1 rule and pass/fail at 75.5 deg.

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Formula and source

4:1 rule: base distance = working_length / 4. Angle θ = atan(rise / run); pass band 75-77 degrees per ANSI A14.7 / A1264.1 (target 75.5°).

ANSI A14.7 (Mobile Ladder Stands and Mobile Ladder Stand Platforms) and ANSI/ASSP A1264.1 by name; OSHA 29 CFR 1926.1053 by section.

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