BlueCollarBench

Trades/Roofing

RoofingTask RO-026apprenticeCodeUS

How do I set up an extension ladder to get onto a roof so OSHA can't write me up?

Prompt as given to every model

How do I set up an extension ladder to get onto a roof so OSHA can't write me up?

Model answers

Pick up to two to compare side by side. Score chips fill in as the judge grades.

Nemotron 3 Ultra 550BScore —

To satisfy OSHA 1926.1053 for roof access:

1. Angle & Placement (1926.1053(b)(5)(i))

  • 75.5° angle: Use the 4:1 rule—base 1 ft out for every 4 ft of working length (e.g., 20-ft ladder = 5-ft base).
  • Quick check: Stand at base, toes touching rails, arms extended. Palms should grasp rung at shoulder height.

2. Extension Above Roof (1926.1053(b)(1))

  • Minimum 3 ft (36 in) above the eave/roof line. This provides a handhold for stepping on/off.
  • Do not step on rungs above the roof edge.

3. Secure the Top (1926.1053(b)(1))

  • Tie off both rails to a substantial anchor (roof anchor, structural member, not gutter). Use ladder hooks or straps.
  • If top cannot be tied, secure the base (stake, cleat, sandbags) and have a second worker foot it only as a last resort.

4. Level, Stable Base (1926.1053(b)(6))

  • Use ladder levelers on uneven ground. Never shim with bricks/blocks.
  • Ensure feet are on firm, non-slip surface. Use non-slip pads on hard surfaces.

5. Condition & Duty Rating

  • Type I, IA, or IAA only (250–375 lbs). No Type II/III.
  • Inspect before every use: no cracked rails, loose rungs, missing feet, oil/grease. Tag damaged ladders "Do Not Use."

6. Climbing Protocol (1926.1053(b)(21–22))

  • Face ladder, maintain 3-point contact (two hands/one foot or two feet/one hand).
  • Carry tools on belt/hoist—never in hands.
  • Keep center of body between rails. Don't overreach.

Critical: If roof edge is 6+ ft above lower level, you need fall protection (guardrail, PFAS, warning line + monitor) per 1926.501(b)(10) once you step off the ladder. The ladder gets you there; it is not your fall protection.

642 tokens · 12.4s

Judge rubric · pending

Not graded yet. Grading starts when the exam run completes.

Nemotron 3 Super 120BScore —

To set up an extension ladder safely and comply with OSHA standards (29 CFR 1926.1053), follow these specific, practical steps:

  1. Angle: Use the 4:1 rule — for every 4 feet of ladder height, the base must be 1 foot away from the wall. Example: For a 16-foot ladder, place the base 4 feet from the structure. This creates a ~75° angle, the OSHA-recommended safe angle.
  1. Extension: The ladder must extend at least 3 feet above the roof edge (or landing surface) to provide a secure handhold when stepping onto or off the roof. Do not stand on the top three rungs.
  1. Securing: Tie off the top of the ladder to a secure anchor point (e.g., roof structure, gutter spike, or dedicated ladder stabilizer) to prevent sideways slip. Use a rope, bungee cord, or ladder lashing kit. OSHA requires securing ladders when used for access to elevations.
  1. Base Stability: Place the ladder on a firm, level surface. Use ladder levelers or dig out soft ground if needed. Never use boxes, bricks, or unstable objects to gain height.
  1. Inspection: Before use, check for damaged rungs, side rails, locks, or feet. Remove defective ladders from service (tag “Do Not Use”).
  1. Three-Point Contact: Always maintain two hands and one foot, or two feet and one hand on the ladder while climbing.
  1. Load Limit: Do not exceed the ladder’s rated capacity (including your weight + tools). Check the duty rating label.

OSHA Violation Triggers to Avoid:

  • Ladder not extending 3+ feet above landing
  • Incorrect angle (too steep or too shallow)
  • Unsecured top (slipping sideways)
  • Standing on top cap or top step
  • Using a damaged ladder

If the roof is over 6 feet high and you’ll be working on it (not just accessing), fall protection (harness, guardrails, or safety net) may be required under 1926.501(b)(1). For simple access only, proper ladder setup per above satisfies OSHA.

If unsure about anchor points or roof stability, consult a licensed roofer or safety professional. Never compromise on ladder safety — falls are a leading cause of construction fatalities.

601 tokens · 4.8s

Judge rubric · pending

Not graded yet. Grading starts when the exam run completes.