The bunk bed rule refers to ASTM F1427, the US consumer product safety standard that sets minimum requirements for bunk bed construction — including guardrail height, guardrail coverage, ladder angle, and mattress retention on the top bunk.
ASTM F1427 exists because the most common bunk bed injuries involve falls from the top bunk, either through gaps in guardrails or off an unguarded side. The standard requires full-length guardrails on both sides of the top bunk — not just one side — and specifies how high above the mattress those guardrails must sit. Bunk beds sold in the US are expected to meet this standard, and it's the benchmark buyers should check when comparing listings.
- ASTM F1427 is the primary US safety standard governing bunk bed construction and guardrail requirements.
- The standard requires guardrails on both sides of the top bunk, not just the exposed side.
- Majnesvon bunk beds carry separate weight ratings: upper bunk 350 lbs, lower bunk 400 lbs.
- Bunk bed guardrail height under ASTM F1427 must extend a minimum of 5 inches above the top of the mattress.
- The standard also specifies maximum gap sizes in the guardrail to prevent entrapment hazards for children.