EN 356 Security Glazing Classifications (updated 2026)
Introduction
This guide to EN 356 security glazing classifications outlines how different performance levels apply to real-world glazing, including bespoke commercial rooflights, windows, and doors.
1. Executive Summary
This white paper outlines the European Standard EN 356 for security glazing, focusing on the classification system, typical glass thicknesses, and recommended applications. The standard defines how glass performs under impact and manual attack, providing specifiers with a clear framework for selecting appropriate glazing in rooflights, windows, and doors.
A key distinction within EN 356 is between impact-resistant glazing (P1A–P5A) and burglary-resistant glazing (P6B–P8B). Understanding this difference is critical when specifying rooflight systems, particularly where security, safety, or insurance compliance is required.
2. Overview of EN 356
EN 356:2000 specifies test methods and classification for security glazing resistant to manual attack.
The standard divides glass into two main categories:
- Class A (P1A–P5A): Resistance to impact (non-burglary rated)
- Class B (P6B–P8B): Resistance to manual attack (burglary-resistant)
Class A products are tested using a 4 kg steel ball dropped from increasing heights, while Class B products are tested using repeated axe or hammer blows.
3. EN 356 Glass Classifications
3.1 Impact-Resistant Glass (P1A – P5A)
These classifications are designed to resist accidental impact or forced entry attempts without tools. They do not provide meaningful burglary resistance.
| Classification | Typical Thickness (mm) | Test Description | Typical Applications |
| P1A | 6.76 mm | 3 impacts from 1.5 m | Low-risk residential glazing, overhead safety glazing |
| P2A | 8.76 mm | 3 impacts from 3 m | Standard domestic windows, rooflights |
| P3A | 9.14 mm | 3 impacts from 6 m | Schools, low-risk commercial |
| P4A | 9.52 mm | 3 impacts from 9 m | Retail glazing, accessible rooflights |
| P5A | 10.28 mm | 9 impacts from 9 m | High-risk areas needing enhanced impact resistance |
Thickness values are typical laminated constructions and may vary by manufacturer.
Key characteristics:
- Designed for fall protection and safety glazing
- Suitable for rooflights, skylights, and overhead glazing
- Increasing resistance with higher drop heights and repeated impacts
3.2 Burglary-Resistant Glass (P6B – P8B)
These classifications provide true resistance to forced entry using tools. ()
| Classification | Typical Thickness Range (mm)* | Test Description | Typical Applications |
| P6B | ~20–25 mm | ≥31 axe blows | High-security residential, commercial entrances |
| P7B | ~25–35 mm | ≥51 axe blows | Jewellery stores, data centres |
| P8B | ~35–50+ mm | ≥70 axe blows | Banks, critical infrastructure |
*Thickness varies significantly depending on laminate build-up and interlayers.
Key characteristics:
- Designed to delay or prevent intrusion
- Require multiple tool strikes to create an opening
- Used in security-critical environments
4. Practical Specification Guidance
4.1 Rooflights & Overhead Glazing
For rooflight applications (including those by Next Gen Rooflights Ltd):
- Minimum recommendation: P2A
- Preferred specification: P4A
- High-risk or accessible roofs: P5A
These levels provide sufficient resistance to accidental impact (e.g., falling objects, maintenance traffic) without unnecessary cost or weight.
4.2 Residential Use
- Standard housing: P2A–P3A
- Accessible glazing (doors, low windows): P4A
- Luxury or high-value homes: Consider P5A or P6B
4.3 Commercial & Public Buildings
- Retail / offices: P4A–P5A
- Schools / public sector: P3A–P4A
- High-risk premises: P6B+
4.4 Security-Sensitive Applications
- Data centres / banks: P7B–P8B
- Government / critical infrastructure: P8B
5. Key Considerations for Specifiers
5.1 Performance vs Thickness
Higher classifications generally require:
- Increased laminated layers (PVB or ionoplast)
- Greater overall thickness and weight
- Stronger framing systems
5.2 Misconception: “All Safety Glass is Secure”
A critical misunderstanding in the market is assuming laminated or toughened glass provides security.
- P1A–P5A: Impact-resistant only
- P6B–P8B: True anti-intrusion glazing
This distinction must be clearly communicated to clients.
5.3 Integration with Frame Systems
Glass performance is only one part of the system. Full security depends on:
- Frame strength
- Fixings
- Installation quality
EN 356 glass is often paired with EN 1627 RC-rated systems for complete protection. ()
6. Conclusion
EN 356 provides a clear and structured framework for selecting security glazing:
- P1A–P5A: Ideal for safety and impact resistance
- P6B–P8B: Required for burglary resistance
For rooflight applications, the optimal balance of safety, performance, and cost is typically achieved within the P2A–P4A range, with P5A used where additional robustness is required.
Correct specification ensures compliance, improves safety, and aligns glazing performance with real-world risk.
7. About the Authors
Alan Saxby
Industry specialist in glazing and rooflight systems
Next Gen Rooflights Ltd
A UK-based provider of high-performance carbon neutral rooflight solutions, delivering compliant and innovative glazing systems for commercial and residential applications.
Next Generation Rooflights – 30th April 2026