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CavityTherm is a built-in insulation system that achieves ultimate U-values within traditional wall construction. CavityTherm is a built-in insulation system that achieves ultimate U-values within traditional wall construction. CavityTherm meets FEES 2014 Part L and achieves zero carbon performance - within a traditional cavity width. Insulation continuity is assured Optional accessories build to a ‘system’ delivering unbeatable thermal bridging detailing.