Material Storage and Rack Stability

Why it matters

Stored material is stored energy. A pipe rack lets go, a drywall stack tips, banded lumber shifts on uneven ground, and suddenly hundreds of pounds move at whoever is closest. OSHA storage rules require stable stacking, height limits, and secured racks. Most storage failures trace to the same three causes: bad base, too high, and robbed from the bottom. Today: how we stack so it stays.

Hazards

• ⚠ Drywall and sheet goods tipping from vertical leaning stacks
• ⚠ Pipe and conduit rolling off racks and unchocked piles
• ⚠ Stacks robbed from the bottom or middle until they collapse
• ⚠ Racks overloaded or assembled without all pins and braces
• ⚠ Material stored on slopes, soft ground, or frozen mud that thaws
• ⚠ Stored loads too close to edges, openings, and traffic

Controls and safe practices

• ✓ Flat, firm base first: no storage on slopes or soft ground without dunnage that levels it.
• ✓ Stack to the limits: respect height limits per 1926.250 and keep heavier material low.
• ✓ Chock round stock: pipe, conduit, and rebar racked with end stops and chocks, banded until used.
• ✓ Take from the top; never rob the bottom or middle of a stack.
• ✓ Sheet goods stored near-vertical need racks with stops, or store them flat.
• ✓ Keep storage back from edges, floor openings, and haul paths.
• ✓ Walk storage areas after wind and rain; restack what shifted before it fails.

Crew discussion questions

1. What is stacked highest on this site, and is it stable and low-heavy?
2. Where are we storing on questionable ground?
3. Which stacks get robbed from the bottom around here?
4. Whose racks and dunnage need repair or restacking today?

Applicable OSHA standards

29 CFR 1926.250

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