Ryan Biggs Clark Davis provided structural engineering services for the repair and renovation of the exterior plaza at the New York Psychiatric Institute. Originally constructed in the early 1990’s, the facility featured a drive-up entrance and walkable exterior plaza supported on a cast-in-place reinforced concrete structural slab over the basement utility spaces and parking garage. The original pedestal paver hardscape system had reached the end of it’s serviceable life.
The plaza system was rebuilt from the structural slab up - featuring a new roof waterproofing membrane system, sub-level drainage mat, structural foam insulation, and two-tone colored cast-in-place concrete hydronic slab. Two stage drains relieve rainwater accumulation at both the slab and membrane levels.
We conducted a structural evaluation and capacity analysis of the supporting reinforcing concrete framing, documented and designed repairs for deteriorated concrete conditions, and detailed the new hydronic (snow-melt) concrete hardscape slab and drive lane for the plaza renovation.