Roof Edge Protection Calculator — Perimeter Guard Rail Quantities
Calculate roof edge protection requirements: post quantities, guardrail lengths, toe boards, and mesh. Covers free-standing, parapet-mounted, and eaves-mounted systems.
Total length of roof edge to protect
2.0m standard maximum
1000mm minimum per BS EN 13374:2019 (principal guardrail, measured perpendicular to the working surface)
How We Calculate This
This calculator determines the components needed for roof edge protection per BS EN 13374, based on the perimeter length and system configuration.
Components
- Posts: At 2m maximum centres around the perimeter
- Top guardrail: 1000mm minimum height per BS EN 13374:2019 Class A, continuous
- Intermediate rail: Positioned so no gap exceeds 470mm
- Toe board: 150mm high at base to prevent material falls
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Verify with your supplier.