The invention relates to a building section including a sub-structure and a cladding member connected in fixed relation relative to the sub-structure. A multi-function elongate, flexible insulating element is disposed between the sub-structure and the cladding member for damping energy transfer between the cladding member and the sub-structure, facilitating alignment of the cladding, and creating a rainscreen configured to drive out moisture from the wall cavities. The flexible insulating element includes a bond breaker disposed on the external surface of the insulating element. The bond breaker prevents externally applied joint sealant compound from adhering to the insulating element. The bond breaker can act as a safeguard to prevent joint sealant deterioration or adhesion to undesired surfaces.