Ministerial View issued for the use of intumescent cavity barrier in external wall cavity at the first floor junction in a two-storey dwelling

Technical ContextThe proposed building is a new build two storey dwelling house. The construction of the walls are roughcast, 100mm blockwork, 50mm cavity and timber frame (breather membrane, OSB, timber studs/insulation, vapour barrier, plasterboard). It is proposed that an expanding intumescent ‘ventilated’ cavity barrier be used at the junction of the ground and first storey. 
See full text of decision by referring to this link to the Ministerial View
Further information may be obtained by looking Report NF51 referred to in the View