Foil faced rigid Polyisocyanurate (PIR) insulation, for external cavity walls of conventional timber and steel framed dwellings with a masonry outer leaf. Height restrictions apply in some cases. QW -STFI may be installed between structural studs. Also, used with insulated dry lining systems and as insulated sheathing or used as part of a system incorporating any combination of these options.
QW-STFI has been tested to BS EN 1365-1:2012 and BS 476-21:1987 for use with structural steel/timber studs, where a fire resistance of 30 minutes is required. In steel stud construction it has 60 minutes fire resistance.