Fire Performance

The Polyroof Team will provide guidance on all aspects of fire testing and standards.

Designers will be reassured to know that Polyroof carry out an extensive programme of fire tests on our liquid applied membranes. Polyroof liquid applied flat roof membranes are tested to external Fire exposure to roofs test (DD CEN/TS 1187 : 2012, Test 4) and these results are classified under the standard BS EN 13501-5 2016. The Classification system set out in BS EN 13501-5, covers external Fire penetration and Spread of Flame of roof systems in their response to external fire exposure.

Our Polyroof 185, Protec, Protec Evolve and Elastex Solo Liquid applied waterproofing membranes can all achieve the highest possible classification under BS EN 13501-5 : 2016 of BROOF(t4). Further details on fire classifications are found within the relevant BBA and ETA certificates for each product in the section below.

In addition, you may wish to note that Polyroof can offer non-combustible insulation options such as Rockwool (stone wool). These products are rated either as Euroclass A1 or A2 in accordance with BS EN 13501-1 classification (Reaction to fire).

BBA Certificates

Protec System
BBA (09/4676)

Protec Evolve 
BBA (09/4676)

 185 GRP System
BBA (91/2604)

Elastex Solo System
BBA (18/5605)

Xtraflex System
BBA (23/6749)

Changes to Building Regulations

  • The Grenfell Tower fire of 14th June 2017 signalled a need for change within the UK construction industry and in May 2018 the Hackett Review entitled, ‘Building a Safer Future’ was published.
  • Approved Document B amended and updated on 19th September 2019 – Volume 1 Dwellings / Volume 2 Buildings Other than Dwellings.

BROOF(t4) Explained

A key requirement of the building regulations is to resist fire spread over roof coverings. BS EN 13501-5 classification refers to four separate roof testing methods T1, T2, T3 and T4 (DD CEN/TS 1187:2012) that measure the performance of roofs. The test method for the UK and Ireland is test method 4. 

BROOF(t4) rating is the highest rating achievable and allows flat roof systems to be classed as ‘unrestricted’ or ‘low vulnerability’, in accordance with relevant national building regulations.

Our Polyroof 185, Protec, Protec Evolve and Elastex Solo Liquid applied waterproofing membranes can all achieve the highest possible classification under BS EN 13501-5 : 2016 of BROOF(t4).

  • BROOF(t4)
    • No penetration of roof system within 1 hour
    • In preliminary test, after withdrawal of the test flame, specimens burn for less than 5 minutes
    • In preliminary test, flame spread less than 0.38m across region of burning

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