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General Building Information |
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Name: |
Jackson Crossing |
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Location: |
Alexandria, Virginia |
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Type of Use: |
Multi-Family Residential |
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Area: |
107,740 sq. ft. |
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No. of Floors: |
5 |
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Project Start and Completion: |
4/4/2014-12/17/2015 |
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Project Delivery Method: |
Owner engadged Architect and Engineers while Harkins provided preconstruction services. After the construction documents were completed a contract with Harkins was finalized |
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Architect: |
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Structural: |
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MEP: |
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Landscape Architect: |
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Specifications Consultant:
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Jackson Crossing is a housing development for low-income residents in Alexandria, Virginia. It is a five story above grade building with a lower level parking garage with 78 parking spots and five levels of residential apartments for a total of 78 units. The building tapers from five stories on the east side to three stories on the west side. The developer is providing occupants a rooftop patio and community spaces. |
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The following are the building codes used in the design of Jackson Crossing: |
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◆IBC 2009 |
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◆ANSI/ASCE 7-02-2005 |
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◆Virginia Uniform Statewide Building Code-2009 |
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Jackson Crossing is located in a Medium Commercial Residential Mixed Use zone, CRMU/M. According to The Zoning Ordinance of the City of Alexandria, Virginia, the purpose of CRMU/M is "to encourage a diversification of uses in unified projects located in proximity to metro stations in order to encourage the conservation of land resources, minimization of automobile travel, and the location of employment and retail centers in proximity to housing".
The maximum allowed floor area ratio allowed for a residential building in a CRMU/M zone is 1.0 FAR. An additional 25% of retail use is permitted.
No Historical Requirements |
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Jackson Crossing's façade has a two toned design. The focus of the building is a light red brick veneer that is accented by light grey cementitious panels. The windows providing light into the units are typically constructed of tempered insulated clear glazing.
The brick or cementitious veneer is seperated with one and a quarter inch insulation by an air space. The veneer and insulation is backed up by wood bearing walls which are sheathed with one and a half inch plywood. The wood bearing wall is insulated with 5/8 inch cellulose insulation between the studs.
The cross section of a typical roof details a single ply roof membrane on top of two inches of rigid insulation and a wood subfloor. This system is supported by an eighteen inch wood truss which contains nine and a half inches of thermofiber batt sound insulation. |
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Jackon Crossing's location is very ideal for access to public transportation. With bus service already running in the area, residents are able to lessen their need for cars and have less of an impact on the environment. In addition, planners are mapping out metro and bus rapid transit for the corridor. Due to the City of Alexandria Green Building Policy, Jackson Crossing is required to achieve one of the following standards: |
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◆LEED-Silver (non-residential) |
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◆LEED-Certified |
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◆LEED for Homes or ANSUICC-700 2008 National Green (residential) or acceptable equivalent |
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From the roof down to the second floor, 18” engineered wood trusses handle the gravity load and are spaced at 24” o.c. at maximum. The wood trusses are supported by wood bearing walls with 2x6 studs spaced at 16” o.c. and span distances of 26’ and 29’ 3”. The loads from the bearing walls are transferred to a 12” 2-way reinforced concrete slab at the second floor. This slab is supported by 16”x24” concrete columns that continue down to a 12” one way slab on the ground floor. There is a lower level garage that required a different column layout. Because of this, concrete beams running along the longer length of the building take care of the transfer columns.
The lateral system from second floor to the roof is CMU shear walls around the stairwells and elevator cores along with wood shear walls in the N/S plan direction. The CMU shear walls rest on concrete shear walls below the second floor.
The foundation of Jackson Crossing is reinforced concrete pile caps resting on piles. The pile caps are typically 7’9” by 7’9” and have a depth of 43”. |
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Harkins Builders headed the construction of Jackson Crossing which began in April of 2014 and is expected to complete in December 2015. The project delivery was not typical as the owner did not finalize a contract with Harkins until the construction documents were finalized. Harkins still provided preconstruction services while the architect and engineers were in the design stage. The site of Jackson Crossing is next to the Jefferson Davis Highway allowing for easy access for construction vehicles. |
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A Dominion Virginia Power Pad Transformer feeds power into Jackson Crossing. The residential service in the building is supplied as 1600A, 208/120V three phase power. This power is send to several panel boards including ones on the second, third, and fifth floor that provide electricity for receptacles, washers, dryers, and corridor lighting. A 40 horsepower fire pump is run with 208V three phase power. Also there is a natural gas generator that provides 150KW, 208/120V, three phase power. This generator is able to power three loads: lighting, the fire pump, and one elevator at a time. |
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The hallways in the typical residential level is lit by Lithonia 22W fluorescent surface mounted lamps with a 120V ballast. 23W surface mounted CFL lamps are located in the hallway of the bedroom units. For the bathrooms, another 23W CFL lamp is mounted over the sink and vanity. |
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The mechanical system for the residential units is an air cooled DX split system while the office and lobby area has a split system heat pump unit. The typical bedroom has a vertical mounted unit with a fan that provides 600 to 1,020 CFM and a 208V condensing unit. The required ventilation in the parking garage is 12,000 CFM for the upper level and 5,250 CFM for the lower level. |
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Jackson Crossing has circulation running down the middle of the longer dimension of the building. Each floor is served by two pairs of stairwells and elevators on each end of the hallway. The elevator and stairwell on the right side of the building terminate at the upper garage level. The elevator and stairwell on the left side terminate at the lower garage level. |
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