Presidents Plaza, Chicago

Presidents Plaza, Corporate Office

The bolt-down joints in the top of a concrete curb in the asphalt-topped, split-slab roof over parking always leaked. Bolt-down systems (a DOT bridge joint crossover) are not watertight. In addition perpendicular cracking in the concrete supporting curbs caused water simply to bypass the joint and the deck waterproofing membrane to leak below. In the second full replacement retrofit, bolt-downs were specified again. As an alternative, the watertight Migutan system was proposed. After complete integration of the Migutan to the hot-rubberized asphalt deck waterproofing and through the use of watertight, factory-fabricated transitions and terminations, the deck is finally watertight.

Before: Leaking through failed bolt-down joints is made worse by leaking through cracks in the supporting concrete header.

During: Watertight, factory-fabricated transitions in the EMSEAL Migutan joint system are integrated into the deck waterproofing to create a continuous, waterproof deck system.

After: With asphalt overlay and landscaping replaced, the entire deck is watertight.