Sometimes it’s necessary for a cavity closer to perform a more important role – to become an integral element within the load-bearing structure of the building, as well as forming a template for associated bricklaying. Cavalok’s structural closers have been developed to bear weights on cavities up to 300mm, meeting Passive House Design requirements and conforming to Fabric First principles. Simple to install, with excellent screw retention, reduced air leakage, and advanced insulating foam technology, Cavalok’s structural closers are rated A for their performance and are reinforced with steep for inner and outer leaf cill support.