Gwinnett County Police Annex Building

Location:

Lawrenceville, GA
 

Year:

2009
 

Owner:

County Capital Projects Program, Lawrenceville GA
 

Architect:

HOK, Atlanta, GA
 

Engineer:

Pond and Co., Norcross, GA
 

Contractor:

Manhattan Construction Co., Atlanta, GA
 

Project Scope

Sq. Footage:

45,000 sf
 
 
 
 
 
 
 
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
Gwinnett County Police Annex Building
 
 
 
 
 
 
 
 
 
 
 
 
 

Design Challenges:
Located in a designated Wind Zone III, a very tight construction schedule and overall aesthetics to complement the adjacent existing police headquarters in color, form, and scale were just a few of the challenges the design team was faced with.

Precast Solutions:
The use of precast insulated wall panels was instrumental on this 45,000 sq. ft. Gwinnett County Police Annex Building constructed for “hardened first responders” according to Federal Emergency Management Agency (FEMA) 361 guidelines. This single-story annex in Gwinnett County, Georgia, houses a fully equipped, state of the art E-911 communications center, emergency operations and data backup centers as part of a $16 million dollar project completed in the fall 2009.

Meeting The Demands Of FEMA 361
FEMA’s 361 guidelines mandate the building must maintain effective, uninterrupted communication, control and assistance in the wake of natural disasters or other regional crises. The great strength of the Gwinnett’s new steel-framed facility is derived from its 150 CarbonCast High Performance Wall Panels with C-GRID® carbon fiber shear trusses for a fully structurally composite panel with relatively low thermal conductivity. CarbonCast High Performance Wall Panels consist of interior and exterior concrete wythes with continuous insulation (c.i.) between the C-GRID. Truss grids cut on a 45-degree angle, structurally join inside and outside wythes so the facility’s walls and roof withstand corresponding design loads for a total exposed area of 12,335 sq. ft.

Four times stronger than steel by weight, non-corrosive carbon fiber is not subject to thermal bridging. Three-inch thick extruded polystyrene was placed as continuous insulation throughout the panels except at connections where thickness is an inch and a half. Overall insulating value for the panels is R-10, which exceeds the code requirement listed at R-5.7.

Designing With Precast
The precast insulated wall panels were manufactured by neighboring Metromont Corporation, at its plant in Hiram, Georgia. Two different exterior faces were created for the panels. A sandstone-color concrete with stacked-stone ashlar block formliner and medium sandblast was applied to the lower part of the precast wall. Higher up, the panels display buff-colored sandblasted concrete with 1” reveals at foot intervals. Precast coping was also applied to the tops of the CMU walls, pillars for an ornamental fence and the entrance sign/monument.

The inherent design flexibility of the precast wall panels complemented the adjacent existing police headquarters in color, form, scale and sense of entry.

Timeline:
Construction, which began on July 7, 2009 and was completed by October 31, 2009.

“The construction time for the precast was approximately three weeks, which really helped expedite the entire schedule,” said Angela San Martin, regional sales representative for Metromont.

 
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