This Rockwool catalogue actually has a very easy to follow guide of what you need to do with cladding and buildings >18m tall to be fire compliant.
http://static.rockwool.com/globalassets/rockwool-uk/downloads/brochures/regulation-guides/rw16-041-routes-to-compliance-update-may16-for-web.pdf
@dubtap started
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This Rockwool catalogue actually has a very easy to follow guide of what you need to do with cladding and buildings >18m tall to be fire compliant.
http://static.rockwool.com/globalassets/rockwool-uk/downloads/brochures/regulation-guides/rw16-041-routes-to-compliance-update-may16-for-web.pdf