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External fire spread on new build


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Hi, not strictly FRA query, but more to do with Building Regs.  In particular, what is allowable materials for external walls.

Situation is a new build - small offices of two storeys where the total height of building is <18m.  Approx. 150msq footprint so fairly small.

Building is positioned between two existing buildings (steel portal framed commercial units with steel cladding on external walls).  The distances between the new build and the adjoining units is >1000mm (more like 3m-4m).

The external walls (all) of the new offices have timber cladding.  It was confirmed that the timber has not been treated for fire resistance.  

Looking at ADB Vol (I've attached diagram I am looking at) am I right in thinking that it is acceptable to have combustible lining on the external walls as the premises are <18m high, and more than 1000mm from adjacent buildings / boundary?? 

Any help / advice always appreciated!!


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