Camp Pendleton Naval Hospital
The Naval Hospital Replacement Project at Camp Pendleton needed to accommodate California's seismic standards and patient safety.
The Naval Hospital Replacement Project at Camp Pendleton needed to accommodate California's seismic standards and patient safety.
The Naval Hospital Replacement Project at Camp Pendleton, the largest military training facility on the West Coast, is a 500,000-square-foot, five-story building that accommodates inpatient medical facilities with 54 patient rooms and up to 60 beds, ancillary departments, emergency care, primary care, and specialty care clinics. It was imperative to control air and moisture infiltration to prevent mold and mildew and protect the patients. The new state-of-the-art facility also needed to be in tune with California’s seismic safety standards, which were adopted following the 1994 Northridge earthquake that caused $3 billion in damages.
With aggressive energy initiatives, seismic conditions and ultimate sustainability goals, the design and construction teams were looking for a level of commitment that could prove all participants in the construction process could not only meet government specifications, but that would demonstrate performance throughout the warranties and beyond.
Most products or systems available at the time could not meet the air infiltration requirements specified for this project. In past seismic events, columns and beams had had damage so the design of this facility was beefed up to allow movement to occur in three dimensions. Deflection joints were incorporated into the design allowing pronounced up and down and in and out movements at corners as well as across the head of the windows positioned under the deflection joints.
The facility design incorporated a rainscreen system and Tremco’s ExoAir 110 Self-Adhered Air & Vapor Barrier Membrane was selected for use on the wall. With a stand-off out to the exterior system of stone, terra cotta and metal panels, the air barrier membrane had to be self-gasketing around fasteners. The “pop-out” windows created a 90 degree angle from the wall. The ExoAir 110 was wrapped into the opening at each floor at the top of the windows.
A 3/4" deflection joint was positioned over the head of each window opening to accommodate a 3/8" movement at each floor level. To accommodate extra movement, Proglaze ETA ribbed silicone extrusions were connected around each with Spectrem 1 Silicone Sealant, providing clear proof through the translucent, sheet of a secure bond and durable connection across the seismic drift joints.
To ensure performance of this design, a mock-up was built and rigorous testing was conducted to determine air leakage under dynamic pressure conditions and its ability to withstand structural wind loads. A series of ten tests were conducted with racking. The mock-up was also tested in accordance with ASTM E331– Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors and Curtain Walls by Uniform Static Air Pressure Difference at 720 Pa (15 psf). The mock-up passed all tests.
To provide the compatible continuity, Tremco’s TREMproof 6100 Hot Rubberized Asphalt with PowerPly modified bitumen membrane heavy-duty protection course and TREMDrain drainage board was used on the roof deck and tied into the parapet wall. Thorough testing was also conducted on the roofing systems to ensure watertight integrity and performance.
A multi-level parking structure was also part of the project and is connected by a bridge to the hospital. Tremco’s Vulkem® low-odor, low-VOC deck coating system was used on the two top decks due to its tenacious adhesion to concrete surfaces and its impressive elongation and recovery to expand and contract with the expected movement.
