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External Thermal Insulation Composite System If you wish to create an air seal in your existing exterior partitions without the want to transform your home, then RetroFoam is the finest option in your project. On the opposite hand, if you’re in search of an affordable option simply to get something in the partitions and you’re not as concerned about energy effectivity and general comfort, then one of the different options would be best. Internal wall insulation will barely cut back the surface …