scope:

Introduction

The roof is a key element in the overall performance of the building envelope. As well as being weathertight, structurally stable and durable, roof designs must also meet the fire performance characteristics set out in the building regulations. This guide aims to help those working with roofs to develop a clearer understanding of their external fire performance characteristics and how they are determined.

With the introduction of the Construction Products Regulation (CPR)[1] on 1 July 2013 and European Conformity (CE) marking of products and systems covered by the CPR, manufacturers of external waterproof coverings have to declare a fire performance classification for their products, but this classification will depend on the make-up of the roof structure and insulation. Roof systems typically comprise a kit of parts that are assembled and installed on site. The elements frequently come from different manufacturers and suppliers, and are brought together only when the roof system is assembled.