One Penn Plaza (PENN 1) is a 57-story Class A office tower in Midtown Manhattan, beside Penn Station and Madison Square Garden. Beneath it sits an eight-level, 160,000-square-foot below-grade parking structure with about 695 spaces. After 50 years, its slabs and concrete-encased steel framing showed spalling, corroded reinforcing and failed waterproofing. With Local Law 126 requiring periodic inspection of every New York City parking structure by a Qualified Parking Structure Inspector (QPSI), Vornado Realty Trust engaged EDG for a parking structure condition assessment, a DOB-compliant parking garage repair program and construction administration, with the garage and tower in use.

EDG's parking garage concrete repair program went well beyond patching: topside, underside and full-depth slab repairs, wall crack injection, encased beam repairs, steel column flange repairs and temporary shoring. Every slab was sounded and surfaces were prepared to ICRI standards. To keep nearly 700 spaces in service around the clock, we set 14 repair phases and seven waterproofing phases, used fast-setting concrete, and specified an overnight-curing traffic membrane for the parking garage waterproofing. When demolition exposed worse corrosion than expected, repairs were redesigned in the field and filed as post-approval amendments to keep the schedule moving.

Every slab was sounded and surfaces were prepared to ICRI standards. To keep nearly 700 spaces in service around the clock, we set 14 repair phases and seven waterproofing phases, used fast-setting concrete, and specified an overnight-curing traffic membrane for the parking garage waterproofing. When demolition exposed worse corrosion than expected, repairs were redesigned in the field and filed as post-approval amendments to keep the schedule moving.