Summary

Edge protection on scaffolding is not optional — it is a legal requirement under the Work at Height Regulations 2005 and is specified in detail in NASC SG4:22 (Preventing Falls in Scaffolding and Falsework). The purpose is twofold: to prevent operatives from falling off the platform edge, and to prevent materials and tools from falling onto people below.

The standard three-component edge protection system — top guardrail, intermediate guardrail (or infill panel), and toeboard — has been the UK industry standard for decades. SG4:22:2022 introduced updated requirements on advance guardrail installation (fitting the top rail before stepping onto the newly erected lift level) which changed erection practice significantly.

Understanding edge protection requirements matters to scaffolding contractors, site managers, and every trade that works on scaffolding. Removing, displacing, or modifying guardrails is a compliance breach and one of the most frequent WAH Regulations enforcement actions taken by HSE inspectors.

Key Facts

  • Top guardrail minimum height — 950mm above the working platform surface
  • Intermediate guardrail position — maximum 470mm below top rail (so no gap exceeds 470mm)
  • Toeboard minimum height — 150mm above platform surface
  • Gap between toeboard top and intermediate rail — no requirement beyond the 470mm rule above
  • Horizontal load on guardrails — must resist 0.74 kN/m horizontal load (or meet the alternative 'collective protection test' in BS EN 13374)
  • Advance guardrail — SG4:22 requires the top guardrail to be installed before the operative steps onto the new lift level
  • Brick guards — mesh panels fitted to guardrails to prevent small items falling; required over pedestrian routes and public areas
  • Debris nets — larger scale protection for whole scaffold faces; required for significant building refurbishment in occupied areas
  • Safe working under the hierarchy — edge protection (guardrails) is collective protection; it applies without requiring any action from the operative
  • Removal of edge protection — only by the scaffolding contractor and only when safe to do so; no other trade may remove guardrails
  • Inner edge — if the gap between the inner edge of the platform and the building wall exceeds 150mm, the inner edge also requires edge protection

Quick Reference Table: Edge Protection Requirements

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Component Minimum Specification
Top guardrail height 950mm above platform surface
Intermediate rail gap No gap >470mm above or below
Toeboard height 150mm minimum
Guardrail horizontal load capacity 0.74 kN/m
Brick guard mesh size Maximum 50mm × 50mm recommended
Debris net aperture Per EN 1263-1 (typically <100mm)
Inner edge gap requiring protection >150mm from wall face

Detailed Guidance

Guardrail Configuration

The standard UK scaffold guardrail configuration:

        ← min 950mm →
Platform │     TOP RAIL (≥950mm above platform)
  ↑      │     (gap ≤470mm)
  │      │     MID RAIL
  │      │     (gap ≤470mm above toeboard)
  │      │     TOEBOARD (≥150mm)
Platform surface

Where the top rail is set at 950mm, and the intermediate rail positioned such that neither the gap from platform-to-mid-rail nor mid-rail-to-top-rail exceeds 470mm:

  • Top rail at 950mm
  • Mid rail at approximately 480mm (470mm gap from top rail, and 480mm gap from toeboard top edge)
  • Toeboard: 150mm high, bottom flush with platform surface

Note: Many firms set the top guardrail at 1050mm or above as a matter of good practice — this is compliant and reduces the risk of an operative overbalancing over the rail.

Advance Guardrail Systems — SG4:22:2022 Requirement

NASC SG4:22:2022 (and its predecessor SG4:15) requires that the guardrail for a new lift is installed before the scaffolder steps onto that lift. This is achieved by:

  • Proprietary advance guardrail systems — clip-on or sleeve guardrail posts that can be installed from the level below, before the operative ascends to the new level
  • Retrofitting from below — using a purpose-designed component that allows the guardrail tube to be lifted and positioned from the level below
  • MEWP-assisted erection — in some circumstances, a MEWP can be used to install guardrails at the new level before scaffolders climb to it

This represents the application of the WAH hierarchy: collective protection (the guardrail) is installed before the person is exposed to the risk. The "old" practice of erecting a lift without guardrails and then fitting them while exposed is not compliant with SG4:22.

For dismantling, the same principle applies in reverse: guardrails are the last component removed, not the first.

Toeboards

Toeboards (also called kickboards or toe boards) prevent materials, tools, and waste falling off the platform edge. Requirements:

  • Minimum 150mm height
  • Continuous around the perimeter — no gaps
  • Secured to prevent displacement (typically clipped to the standard or to the board end)
  • Positioned at the outer face of the platform boards

Common omissions or defects:

  • Toeboards not fitted at all (especially on upper lifts deemed "safe")
  • Toeboards fitted but not secured, so they can kick out
  • Gap at corners where toeboards don't meet
  • Toeboards too short (cut to a non-standard length)

Brick Guards and Debris Netting

Brick guards are rigid mesh panels fitted to the face of the scaffold guardrails. They prevent small items (brick fragments, screws, mortar, tools) from passing through the guardrail gap and falling. Requirements:

  • Required on any scaffold adjacent to a pedestrian footway, public area, or road
  • Also recommended wherever materials are being cut or broken on the scaffold (brick cutting, stone dressing, demolition)
  • Mesh aperture should not exceed 50mm × 50mm for brick guard use
  • Must be secured to prevent displacement — clipped or tied at top and bottom of each panel

Debris nets (also called containment nets or safety nets) are installed across the entire scaffold face or below scaffold platforms. They are required for:

  • Large-scale refurbishment of facades in occupied areas
  • Buildings adjacent to footways where significant debris generation is expected
  • Projects where local authority licensing requires containment

Debris nets are specified in EN 1263-1 (Safety Nets — Safety requirements, test methods). Standard nets have mesh aperture ≤100mm. Net design, attachment, and inspection by competent person is required.

Scaffold Fans (Overhead Protection)

A scaffold fan is a projecting horizontal platform extending from the scaffold out over the public footway below, providing overhead protection from falling objects. Requirements:

  • Typically required at first lift level (approx. 3m above footway) on scaffolds adjacent to public footways
  • Must project beyond the scaffold face to protect the full footway width
  • Must be close-boarded (no gaps >25mm) to contain small items
  • Must be designed to carry falling materials (light duty — for containment of small items, not for heavy impact)
  • Lighting required at the face of the fan after dark (red lights at head height)

Local authority (highways authority) scaffold licence conditions often specify fan requirements. Always check licence conditions before erection.

Inner Edge Protection

Often overlooked: if the inner edge of the working platform (closest to the building) has a gap of more than 150mm between the boards and the building face, inner edge protection may also be required. This is common when:

  • The scaffold is set away from the building (e.g. because of an overhanging feature)
  • The building has a step-back above a certain level
  • A birdcage platform has an opening in the centre for a rooflight or services

WAH Regs Schedule 2, paragraph 4 addresses this. The 150mm limit is not explicitly stated in the Regulations but is widely adopted as the practical threshold below which the gap is not considered a significant fall risk.

Frequently Asked Questions

Can other trades remove guardrails to make it easier to load materials?

No. Only the scaffolding contractor may modify or remove guardrails, and only when there is a safe system of work in place (typically with edge restraint, harnesses, or a temporary barrier). Any trade that removes a guardrail without scaffolding contractor involvement is in breach of the Work at Height Regulations and assumes liability for any subsequent incident.

Does the top guardrail have to be a full tube, or can a proprietary rail system be used?

Either is acceptable, provided the rail meets the load capacity requirement (0.74 kN/m horizontal) and height requirement (≥950mm). Many proprietary guardrail systems use mesh infill or folding panels. These must meet BS EN 13374 (temporary edge protection — performance requirements, test methods) or the equivalent load requirement via calculation.

Are brick guards required on all scaffolds?

No — only where there is a risk of materials falling onto people. A scaffold around a domestic rear extension with no public access below may not require brick guards. A scaffold on a busy high street at height, used for masonry work, definitely does. The risk assessment for the project should determine whether brick guards are required. Local authority licence conditions may impose them regardless of the formal risk assessment.

What is the difference between a brick guard and a debris net?

A brick guard is a rigid or semi-rigid mesh panel fitted to the guardrail of the working platform, preventing items passing through the rail gap. A debris net is a softer net system installed across the full face of the scaffold or below platforms, designed to catch falling items over a larger area. Brick guards are simpler and more common; debris netting is used on larger refurbishment projects with significant facade debris generation.

Regulations & Standards

  • Work at Height Regulations 2005 (SI 2005/735) — Schedule 2: detailed platform and edge protection requirements

  • BS EN 13374:2013+A1:2018 — Temporary edge protection systems — performance requirements, test methods

  • EN 1263-1:2014 — Safety nets — safety requirements

  • NASC SG4:22 — Preventing Falls in Scaffolding and Falsework; advance guardrail requirements

  • NASC TG20:21 — Edge protection specifications within scaffold design

  • NASC SG4:22 — preventing falls in scaffolding and falsework

  • HSE Work at Height — edge protection — HSE guidance on edge protection

  • Work at Height Regulations 2005 Schedule 2 — full text of schedule

  • work at height regs 2005 — WAH Regulations duties and hierarchy of control

  • scaffold loading limits — loading limits for platforms including boards and rails

  • scaffold inspection records — checking guardrails and toeboards at inspection

  • scaffolding on public highway — additional requirements near highways including fans