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8 <br /> Chapel Hill Old Town Hall Structural Assessment <br /> Page 2 <br /> Background and Description <br /> The original building, built in 1938, is a two story building with a basement and consists of <br /> exterior multi-wythe load-bearing brick walls. The typical floor framing consists of a two inch <br /> thick concrete slab on lathe supported by open web steel joists at 16 inches on center that <br /> frame either to masonry walls or steel beams and columns. The roof framing consists of slate <br /> shingles on gypsum planks on sloping open web steel joists, supported by steel beams and <br /> columns. There is a wood framed cupola near the south end of the roof that is anchored to the <br /> steel framing with 3/a inch diameter rods. <br /> The original building had a split-level basement and first floor, with the rear of areas <br /> approximately four feet lower than the front areas. The second floor was at a consistent <br /> elevation. <br /> The following is a brief list of some of the significant structural work done in the 1963 <br /> renovations: <br /> 1. A mezzanine was added between the lower first floor and the second floor. <br /> 2. A new stair was also added to the rear of the building. <br /> 3. The original cupola was replaced with a similar cupola. <br /> The following is a brief list of some of the significant structural work done in the 1989 <br /> renovations: <br /> 1. The mezzanine that was added in 1963 was removed. <br /> 2. New first floor framing was added at the rear of the building to eliminate the split-level <br /> floor and create a first floor at a consistent elevation. <br /> 3. A portion of the first floor framing at the southeast corner was removed and replaced <br /> with new floor slab on metal form deck, steel joists, steel beams, and two columns with <br /> footings below the basement slab. (According to the structural drawings, the design live <br /> load for in this area is 100 PSF.) <br /> Observations: <br /> At some locations the mortar has deteriorated due to exposure to moisture. See photos below. <br /> ■ <br /> ■ <br /> LL _ <br /> r® <br /> Area below catch basin on west side. Deteriorated mortar below area in left photo. <br />