125 Lake Street
Parking Deck Structural Restoration • White Plains, NY
Parking Deck Structural Restoration
The North Tower parking garage at Stepping Stones Apartments had reached a critical state of deterioration. Aging reinforced concrete slabs, corroded steel beam connections, and compromised structural integrity demanded a comprehensive intervention — not a patch job, but a full structural rebuild of the garage and exterior ramp. DeRosa Builders engaged L&M for the complete structural restoration scope: new W12x50 steel columns with epoxy anchor systems, full concrete deck demolition and replacement with a new 6-inch reinforced slab on composite metal deck, waterproofing membrane systems, and a new asphalt driving surface — every phase coordinated with temporary shoring to maintain structural stability during active demolition.
Project Overview
A full structural rebuild of a multi-level garage and exterior ramp — steel, concrete, and waterproofing — sequenced around temporary shoring to keep the structure stable throughout.
Scope of Work
New Steel Columns
W12x50 steel columns with custom 1" base plates, leveling nuts, and 3/4" epoxy anchor bolts set into existing footings with non-shrink grout beds
Structural Steel Beams
New steel beams installed per structural plans with bolted and welded connections to existing W36x160 girders and new columns
Concrete Deck Replacement
Sawcut and removal of deteriorated slabs, replaced with new 6-inch reinforced concrete on 1.5-inch composite metal deck with welded wire fabric
Concrete Repair & Crack Injection
Chip and remove deteriorated concrete to expose corroded reinforcing steel; clean, treat, and patch to original profiles. Structural epoxy injection of horizontal cracks
Beam Reinforcement
New 1/2" x 6" stiffener plates and 1" x 9" cap plates welded to existing W36x160 beams at critical load-transfer zones and column connections
Waterproofing System
Full waterproofing membrane applied to the new deck surface to protect against moisture infiltration before the asphalt wearing course
Structural Shoring
Temporary shoring installed before any demolition to maintain stability of the multi-level garage throughout the reconstruction phases
Exterior Ramp Restoration
Complete structural repair of the exterior access ramp matching the garage deck scope — new beams, concrete slab on metal deck, and waterproofing
Asphalt Paving & Finishing
New 2-inch asphalt wearing surface over the waterproofed deck for vehicular traffic with proper slope-to-drain grading
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