1 Scope
This British Standard provides a test method for determining the fire performance characteristics of non‑loadbearing external cladding systems , rainscreen overcladding systems and external wall insulation systems when applied to the face of a building and exposed to an external fire under controlled conditions. The fire exposure is representative of an external fire source or a fully‑developed (post‑flashover) fire in a room, venting through an opening such as a window aperture that exposes the cladding to the effects of external flames, or from an external fire source.
This British Standard does not cover the performance of glazed window openings or the detailing at such openings.
This British Standard does not apply to curtain walling systems or systems that include glass panels.
NOTE Performance Criteria and Classification methodology of the external fire performance can be found in references such as Report BR 135: Fire performance of external thermal insulation for walls of multi‑storey buildings [3].