Rainscreen cladding is a lightweight, non-load bearing system attached to the outside of a building using a bracket and rail system. The cladding system provides protection from wind and rain, improves the thermal performance and limits solar gains. A ventilated void, typically 50mm, behind the cladding keeping the system dry. Rainscreen systems are also available that use a traditional brick (or block) external leaf and nominal 50mm clear cavity. URSA FACADE N35, thermal conductivity 0.035 W/mK, may be used. The ventilated cavity and external insulation protect the building from summer overheating whilst during the heating season advantage can be taken of the high thermal mass of concrete framed buildings. Larger slab size, 1350mm x 600mm, means 12.5% fewer boards to install and 12.5% fewer fixing are required. URSA FACADE N35 is totally non-combustible, Euroclass A1, so do not add any fire load to the building or prejudice the overall fire performance of the wall. The presence of the ventilated cavity behind the cladding system means that cavity barriers as required to prevent the spread of fire and/or smoke. It is recommended that horizontal cavity barriers are installed at every compartment floor level, at roof level and if required vertical barrier to further sub-divide the cavity at compartment walls. See Approved Document B (England & Wales) and the Fire Section of the Technical Handbooks (Scotland). Similarly all openings should be correctly fire stopped to prevent a fire from inside the building being able to break into the cavity. It should be noted that the Approved Document B for England & Wales requires insulation products in high rise (18m or more) cladding systems be of ‘limited combustibility’ or better. In Scotland the insulation should be ‘non-combustible’ in buildings above 11m in height.