875 N Michigan Avenue
At 875 N Michigan Ave, or better known as John Hancock Tower, Novum was contracted in a Designer Assist role for the renovation of both the Chestnut Street and Delaware Street entrances to the building. Novum furnished and installed the new glass canopies and glass entrance walls to replace the existing canopies at each entrance. Each scope is structurally supported using Novum’s Architecturally Exposed Steel System with painted steel members. The glass is attached to the steel using Novum’s Point Supported Glass System (PSG-System) with stunning stainless steel rotules and painted steel spiders. The screen wall and canopy at the Chestnut Street entrance are each 87’-41/2” long. The canopy is 16’-11” wide and cantilevers from the building. The screen wall begins 6” above ground level, stands approximately 12’-8” tall below the canopy, and is angled slightly away from the building. The screen wall and canopy at the Delaware Street entrance are each 46’-61/8” long. The canopy is 16’-11” wide and also cantilevers from the building. The screen wall begins 6” above ground level, stands approximately 12’-8” tall below the canopy, and is angled slightly away from the building.
The new glazed entrances are supported by utilising outriggers from the existing canopy that was renovated by this project. The outriggers from the existing canopy consist of tapering double plates that provided locations for the Novum steel to support. The new purlins for the canopy support the underside of the outriggers as the purlins pass by each outrigger. The wall structure is supported by hanging the new wall steel on the existing outriggers near the building. All the steel consists of Novum AES System HSS 8x3 members that were prime and painted prior to being installed. The prefinished steel led to a quicker and easier installation on the job site in busy downtown Chicago.
The glazed entrances for both the wall and canopy are made up of all fully tempered and low iron glass in a laminated glass makeup. The glass makeup has a 50% line frit on the #2 surface that helps to hide the structure behind and above the glass. The typical panel for both the canopy and wall is approx. 9’-9” x 4’-3”. All the glazing is supported with Novum Buttonhead Point Supports that are attached to the steel structure with plate spiders. Novum was thrilled to have contributed to the spectacular and historic staple building in the centre of the windy city.