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BKE 3


BUILD ING KNOWLEDGE EX C HANG E


Moreover, BROOF (t4) does not provide any indication as to how the roof system will perform when exposed to fire from inside the building - which may fuel a fire and emit toxic gasses and smoke.


As such, BROOF (t4) classification does not automatically allow such roof systems to be continued uninterrupted over compartment walls, where it is necessary for the deck material* to be Euroclass A2-s3, d2 or better.


The Euroclass combustibility rating of an insulation product can easily be verified by requesting a Declaration of Performance certificate from the manufacturer.


Classifying compliance Regulation changes have made it increasingly complex to navigate routes to compliance. For example, the ban on combustible materials in external walls of relevant buildings 18m above ground level, has defined balconies and upstands as ‘attachments’. This means the insulation used in these applications must be A2-s1 d0 or better. A BROOF (t4) rating would not be sufficient to determine the required performance in this instance.


ADB also specifies that roof coverings carried over compartment walls need to be on a deck of non-combustible material. To comply with the regulations, these applications demand insulation with a non-combustible Euroclass rating.


In a bid to reduce fire risk and minimise room for installation error, many roofing contractors are starting to adopt a simplified approach to insulation design - using a non-combustible material across the whole flat roof area. This strategy can often result in efficiency gains on-site as it removes the need for close coordination associated with using a combination of different insulation materials.


With the ban on combustible materials expected to be extended even further through the building envelope, the transition to non-combustible specifications will not only make flat roofs safer today, it will also futureproof designs for tomorrow.


(Our thanks to Will Wigfield, Rockwool for this BKE article)


ROCKWOOL WWW.ROCKWOOL.CO.UK/FIFTHFACADE 9


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