Below-grade waterproofing was completed in Q4 2024, and air barrier installation is underway as of 2025. Integrating Systems Without GapsThe below-grade waterproofing had to tie into a hot rubber waterproofing system and the air barriers, presenting design collaboration and compatibility issues. Although GCP was originally brought on to supply their PREPRUFE® below-grade waterproofing system, its products were not specified for the above-grade air barrier. PERM-A-BARRIER® VPL 50RS UV Stable Wall MembraneA liquid-applied air barrier that rapidly resists wash-off, allowing work to continue during rainy conditions. Long-Term Protection for Critical InfrastructureWith the medical tower’s structure now sealed by a continuous, high-performance barrier system, Providence Swedish is prepared to offer uninterrupted care in a resilient, energy-efficient environment for decades to come.