Agenda Packets - 1998/04/06 - Laserfiche WebLink

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IMounds View City Hall Wold Architects and Engineers Renovation Study November 3, 1997 1 OPOPTION 1 - Replace Rooftop Units I This option may seem only a short-term solution. After all, rooftop units have a fairly short life expectancy of 12-15 years. They provide only one control zone per unit. It can also be difficult to keep these units serviced properly to provide adequate ventilation and control. However, r we also believe that the work of Option #1 could be accomplished with the least amount of disruption in service. The occupants are familiar with the operation of the rooftop units. They are also very familiar to local service contractors. There would also be some rebates available j from NSP for an increase in unit efficiency. !! The roof of the 1974 and 1961 building sections has deteriorated to the point that it should be I replaced immediately. The single-ply membrane over the 1974 building section seems to have suffered considerable shrinkage. It has already pulled away from the curbs supporting the rooftop units, and it will soon separate from the perimeter parapet flashings. The roof above t the 1961 section is a built-up style and is simply decayed. 1 Six of the eight units are located above these sections of the building; including the three that I do not function on cooling. In Option#1A, we propose to replace three inoperative units, in Option #1 B we propose replacing the five older rooftop units. Then the oldest of the rooftop units would have been installed in 1994. III Costs: I General Costs 1A 1B • Roofing $ 105,000 $ 105,000 • Tuckpointing $ 4,000 $ 4,000 I • Fire Protection UL $ 18,750 $ 18,750 HVAC Equipment $ 33,000 $ 60,000 Electrical $ 7.500 $ 10,000 I $ 168,250 $ 197,750 Factor for Contingency, Fee & Misc. Costs x 1.28 x 1.28 ITotal Option 1 $ 215,000 $ 253,000 I I 1 Page 2 Commission No. 97102 I