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Free toolbox talk: trench cave-ins and the 5-foot rule
A one-page safety talk for any day the crew digs a trench for footings, drains, water or sewer lines. Why trench walls give way without warning, six key points, three questions for the crew and a sign-in block. Read it here or print this page.
Trench Cave-Ins: The 5-Foot Rule
Why it matters. Trench walls can collapse without warning, and soil is heavy: a single cubic yard can weigh more than a ton. A cave-in can bury and crush a worker in seconds.
Key points
- Trenches 5 ft or deeper need a protective system: sloping, benching, shoring or a trench box, unless entirely in stable rock (1926.652(a)(1)).
- Under 5 ft, a competent person must examine the ground. If there is any sign of a potential cave-in, protect it anyway.
- Trenches deeper than 20 ft need a protective system designed by a registered professional engineer (1926.652(b), (c)).
- Never enter an unprotected trench, even 'just for a second' to grab a tool or check a pipe.
- Stay inside the protected area of a trench box, and stay out while it is being installed, removed or moved (1926.652(g)).
- OSHA's short version: Slope it. Shore it. Shield it.
Ask the crew
- How deep is our deepest trench today, and how is it protected?
- What signs of a cave-in would make you get out right away?
- What do we do if someone is partly buried? (Do not jump in.)
Reference: 29 CFR 1926.651, 1926.652 | osha.gov/trenching-excavation
Sign-in
Date ______ · Job site ______ · Talk leader ______
| # | Printed name | Signature | Company / trade |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 |
The printable PDF has 12 sign-in lines.
How to run it
- Hold it at the trench before anyone goes in, not in the truck.
- Look at the depth, the soil, the spoil pile and any water together, and say out loud who the competent person is today.
- Agree how the trench will be protected (sloping, shoring or a trench box) and where the ladder goes.
- Ask the three questions, let the crew answer, then have everyone sign and file the page with your safety records.
A training aid that supplements your safety program. Not a substitute for required training, a written safety program, a site-specific hazard assessment, or a competent or qualified person where OSHA requires one. OSHA references are federal (29 CFR 1926 and related parts), checked October 2026; state-plan states may have stricter rules. Not legal advice.
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