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Building Stats




Building Systems Summary


As the building drawings neared the 50% Design Development stage, it was decided by Presby's Inspired Life, to seek out and engage a construction manager to assist with preconstruction and constructability issues. At this point, the beginning of the third quarter 2008, The Whiting-Turner Contracting Co. was hired for both preconstruction and construction management services. Whiting-Turner is currently contracted to Presby's Inspired Life as a CM at Risk, with a design-bid-build negotiated GMP delivery method.

In order to attach this addition to the existing medical center, a small portion of the eastern-most façade will be removed. The demolition will affect five floors, penetrating into approximately three rooms on each floor, ultimately disturbing a total of 3325 square feet of building area. There are no known hazardous materials located within these spaces. The bulk of the demolition involves the removal of masonry block walls, several steel columns, interior framing, the exterior stone veneer, and multiple windows. A seven inch expansion joint will be utilized on the second through fourth floors to join the addition with the existing structure.

In order to construct this addition in an orderly and timely fashion, the building will be built in three phases, per floor, as seen in the figure below.  Completing the work within Phase 1 region will be extremely important to Presby’s Inspired life due to the close proximity to the active medical facility at the south west corner.  Debris and air contaminants must be closely monitored since the residents and patients within the current facility may have medical conditions that are extremely sensitive to dirty and polluted air.

Construction Sequence Diagram:


PECO Power, an electric and natural gas utility subsidiary of The Exelon Corporation, will be the main provider of electrical energy for the Medical Center Addition.  Three new PECO 1000KCM conductors will be brought into this facility and combined with two of the campus’ spare electrical feeds; three 500KCM conductors (plus one #3/0 ground) as well as three #2 conductors (plus one #2 ground). Each of these three separate power service feeds will be enclosed within five inch conduits. The new PECO service will be brought into a 1200A breaker which will then combine with the other two services at a 15KV Fused Switchgear.  The primary transformer, located within the unit substation, has been sized to 1000KVA.  A three phase, four wire system will be utilized at a 208/120V primary/secondary power setup. Located on the first floor is a 350KW emergency generator which will support the medical utilities in the event of a power outage.


Providing an adequate amount of light at a continuing care retirement community is essential to the safety of the residents. To meet the required lighting level, 50 different luminaire types have been utilized. The main type of lighting fixtures include 2'x2' indirect fluorescent, 2'x4' lensed fluorescent troffer, 6" & 7" dimmable horizontal downlights, LED night lights and vanity/bed lights. The lobby and dinning rooms will be lit with decorative pendant luminaires. Any lights that have been designed for bathrooms, spas, or other potential locations with moisture have prescribed moisture requirements.


Three mechanical rooms have been located on both the second and third floors, with each room spread out in an effort to reduce long duct runs.  One air handling unit will be located within each region of the phasing sequence (construction sequence figure above) enabling a less complex MEP coordination effort between phases.  An efficient HVAC design has been developed to ensure that each mechanical room only serves the adjacent regions of that wing.  The fourth floor does not house any HVAC equipment and is consequently served from the equipment in the floors below.  Moore Engineering, the MEP engineering firm, has designed a four-pipe air/water system which allows for improved temperature control and adjustment for each individual resident room as well as in each general public or office regions.  Three fan coil units, eight air handling units, and four energy recovery units are some of the types of mechanical components that have placed throughout this building’s design.


JJ Earth Engineering Incorporated, the geotechnical engineer, performed a site soil analysis which found the water table to be between 4.5’ and 9’.  The resulting data collected within the building footprint, reviled soil comprised of ‘variable fill materials, loose to medium dense residual soils and decomposed to highly weathered rock’.  Due to this soil type, shallow foundations cannot be utilized unless the soil is reinforced with some form of caisson or pile.  The recommended foundation system, by JJ Earth, is a rammed aggregate pier (GeoPier) which consists of stone columns supporting high capacity spread and strip footings.

Due to the low floor-to-floor heights as well as the integrated parking garage requirement, the best option for this structure is post-tension concrete.  The existing medical facility has two levels with floors-to-floor heights as low as 11’-4” which makes utilizing structural steel extremely difficult and expensive.  With the proposed post tensioned concrete structure, 8” slab thicknesses have been designed for the upper three floors. The lower two levels will have slab thicknesses of 12" which but also have floor to floor heights of 14' allowing SUV's and other larger vehicles to park in this facility. The tendons used to place compression into the slabs range from 2” to 9” in diameter with a designed load capacity between 18 KLF to 34 KLF. As seen in the construction sequence figure above, the concrete pours will follow a three phase pattern per floor.  Cast-in-place concrete will be used for the spread footings, columns, floor slabs, and to fill the CMU foundation walls.  Given that the superstructure is almost entirely comprised of concrete, it will be critical to select a concrete subcontractor that has a high level of experience with the different concrete applications being employed within this addition.

The roof structure will be the only building component utilizing structural steel.  Intermediate wide flange beams will be placed between the concrete columns and K-series joists will span between the WF beams.  While pricing and bidding this project, it was discovered that the spray on cementatious fireproofing in the existing building (where the two buildings meet), must be reapplied to bring the existing fireproofing up to current code standards.


In order to meet the domestic water needs of this facility, three 6" and one 4" water main will be brought into the west side of this building. These four mains have been equally spaced out in an effort to design utilizing the least amount of piping runs. These water mains will be supplied from the campus' water supply which is located directly west of this addition at the current existing medical facility. Domestic hot water supply is set at 140 degrees, and a high temperature hot water line will be installed for sterilization purposes.


Due to the dual nature of this building, a combination dry and wet pipe fire suppression system will be installed.  The lower two floors will utilize a dry pipe suppression system given that these regions are parking garage space exposed to exterior temperatures.  The upper three floors will utilize an instant wet pipe system due to the nature of the residents living within this facility requiring immediate protection if an emergency were to arise.


Given that this facility will be housing senior citizens, elevators will be a crucial element to their mobility throughout this five story complex. Two standard pre-engineered hydraulic passenger elevators will be installed to move residents from the parking levels to the appropriate level of their living quarters. Both elevators are to have a 4500 lbs. capacity with approximately 48 square feet of interior space.