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Guardrail System Fall-Protection Compliance Checker

Check a guardrail system's top rail height and rated load capacities against the fixed requirements of OSHA 29 CFR 1926.502(b).

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
3.5 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Top rail height

42 in

High confidence

Height (39-45in required): PASS. Top rail load (≥200 lbf required): PASS. Midrail load (≥150 lbf required): PASS. This restates the fixed requirements of OSHA 29 CFR 1926.502(b) only — it does not check post spacing/anchorage, screen/mesh requirements between the top rail and walking surface, the 21-inch wall/parapet exemption, or overall system installation quality. A competent person must verify the complete installed system.

Top rail rated load capacity
200 lbf (OSHA min 200)
Midrail rated load capacity
150 lbf (OSHA min 150)

At the values currently entered, the top rail height works out to 42 in. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Add the equipment this sizes

This result is a specification — 42 in — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • OSHA 29 CFR 1926.502(b) Guardrail Systems (verified against the regulatory text): top edge height must be '42 inches (1.1 m) plus or minus 3 inches (8 cm) above the walking/working level' (i.e. 39-45 inches); midrails installed 'at a height midway between the top edge of the guardrail system and the walking/working level'; top rails must withstand 'at least 200 pounds (890 N) applied within 2 inches of the top edge'; midrails and structural members must withstand 'at least 150 pounds (666 N) applied in any downward or outward direction'; midrails/screens are not required 'when there is no wall or parapet wall at least 21 inches (53 cm) high'. These are FIXED regulatory values (a performance standard restated directly, not an engineering estimate).

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Frequently asked questions

What top rail height does OSHA require for a guardrail system?
29 CFR 1926.502(b)(1) requires the top edge to be 42 inches (1.1 m) above the walking/working surface, plus or minus 3 inches — so any height from 39 to 45 inches complies.
What load must the top rail and midrail withstand?
Per 1926.502(b)(3), the top rail must withstand at least 200 lbf (890 N) applied within 2 inches of the top edge. Per 1926.502(b)(7), midrails and other structural members must withstand at least 150 lbf (666 N) applied in any downward or outward direction. Both are manufacturer-rated or engineered values you supply — this checker only compares them to the OSHA minimums.
Does a passing result mean my guardrail system is fully OSHA-compliant?
No. This restates the fixed requirements of OSHA 29 CFR 1926.502(b) only — it does not check post spacing/anchorage, screen/mesh requirements between the top rail and walking surface, the 21-inch wall/parapet exemption, or overall system installation quality. A competent person must verify the complete installed system.