To limit the probability that the performance of sealant backing will fall significantly below expectations with respect to
This is to limit the probability of three-sided adhesion of sealants, which could lead to excessive movement of the backside of the sealant between substrates, which could lead to the premature failure of sealant joints, which could lead to precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of exterior walls or elements protected by exterior walls, which could lead to harm to persons.