Fire Performance

Building Regulations Approved Document B (2024 edition) sets out the rules for fire safety of buildings. Section B2 covers internal fire spread, and applies to the linings of both the roof and walls of buildings. Section B4 covers external fire spread and applies to external coverings or roofs and walls.

Lonsdale aluminium glazing systems are designated thus:

TestTest CriteriaResult
External Fire ExposureEN 13501-5:2016BROOF(t4)
Internal Fire ExposureEN 13501-1:2018Class B, s1-d0