A few weeks ago, I promised to find out the stories behind some images I posted of the Pulitzer’s construction. Well, today I interviewed Steve (Facilities Manager) and asked him about this one:

Steve described the process of building the Mezzanine and why a tent was necessary to complete this. It began with ordering window frames. The Pulitzer’s windows have extruded aluminum frames that were custom-made and sized for the building. The company that worked on these said they couldn’t create the frames without having the exact dimensions needed. The widths of the Mezzanine windows were known, however, they didn’t have the height. The Mezzanine ceiling wasn’t scheduled to be built until after the rest of the building’s walls were complete.
Therefore, they had to push up construction on the Mezzanine without delaying the schedule for the rest of the building. This put the work right in the middle of winter, which meant the concrete had to be poured between December and January. This created a few challenges:
First of all, since the Mezzanine is elevated, cold air could move freely around the concrete, which greatly increased the chances for freezing. Additionally, plywood that was laid down for the pouring could absolutely not get wet. If it did, the wood would swell which would then create lines in the concrete after it was poured.
Additionally reinforcing steel was placed on top of the plywood. This runs through the concrete and is what gives it its tensile strength. Because the concrete on the Mezzanine roof is thin, a large amount of steel had to be put down, and in precise locations so the concrete would hold. As Steve said, it looked like a sculpture. Here’s a photo:

You can see the wood underneath that thick web of steel. If that plywood got damaged in any way, all that steel would have to be removed and then replaced.
All these conditions made it absolutely necessary to have a tent to protect the construction process against the winter elements. It definitely gives you something to think about next time you’re sitting up on the Mezzanine!