GCP Applied Technologies' PERM-A-BARRIER Detail Membrane supports the integrity of the building envelope by sealing complex areas that are especially vulnerable to air infiltration and water intrusion. By addressing these points of vulnerability, it helps prevent moisture accumulation that can lead to premature material degradation, mold, or structural damage. Whether used on commercial or residential projects, this 18-inch wide membrane provides a durable, weather-resistant layer that contributes to a longer-lasting, more resilient building structure.