External Wall
In the case of external walls, the proximity of a building to the relevant (facing) boundary determines the probability of it being a danger to other buildings on adjoining sites (if it is on fire) or it being at risk from a neighbouring building on fire. Requirements made in connection with building regulations therefore specify different performances for external walls depending upon their distance from the relevant boundary.
For fire rated external walls for Class 7b and 8 buildings refer to the Stramit Uniguard System http://www.stramit.com.au/product-range/stramit-uniguard