UNITED KINGDOM—Willmott Dixon has commissioned comprehensive fire safety tests for cavity barriers on Cross-Laminated Timber to eliminate a technical gap that has created uncertainty and delays on cross-laminated timber (CLT) projects across the sector. The testing programme, which Willmott Dixon did in partnership with passive fire protection specialist Siderise and CLT manufacturer KLH, provides the industry with certified solutions for projects using cross-laminated timber (CLT) and Siderise cavity barriers in both wall and floor applications. Previously, all projects would have required individual technical assessments. …the tests examined three critical interface scenarios that appear across CLT construction projects: wall interfaces in vertical configuration with EW-CB 30 Cavity Barrier; floor and wall interfaces in horizontal configuration with EW-CB 30 Cavity Barrier; and floor and wall interfaces in horizontal configuration with RH25 90/30 Cavity Barrier for rainscreen applications. All three tests passed successfully, covering worst-case scenarios including 100mm five-layer CLT panels tested to rigorous European standards.