General Building Data
Architecture
Design and Function Components:
Milestone Building #4 is the third of five buildings to be erected on a 55 acre site in Germantown, MD approximately 30 miles NNW of the nation’s capital. The Milestone Business Park is to be constructed in three phases; the first phase consists of Buildings #1 and #2, Building #4 is in the second phase and Buildings #2 and #5 are future development during the third phase. Along with the construction of the buildings, each phase includes an asphalt parking lot.
Milestone Building #4 is a LEED Core and Shell project with a total proposed score of 33 points or Silver Certification. The design team utilizes all five LEED categories; Sustainable Sites (8 points), Water Efficiency (5 points), Energy and Atmosphere (3 points), Material and Resources (3 points) and Indoor Environmental Quality (10 points). The project will also receive four (4) points for Innovation in Design which includes a LEED AP, Explemplary performance, Education/Outreach and Green Housekeeping.
Milestone Building #4 will be completed as a core and shell, finishing only the lobbies, bathrooms and stairwells. The long spans allows for an open floor plan to maximize spatial flexibility when designing interior fit-outs.
With glass entrance doors, aluminum frame window system and decorative brick façade, Milestone Building #4 matches the buildings constructed in phase one. Typically, each of the stories stands 13’-4” tall with the metal screened penthouse at 16’-4”.
Major Codes:
| International Building Code |
2003 |
| International Mechanical Code |
2003 |
| International Fuel Gas Code |
2003 |
| WSSC Plumbing Code |
1988 |
| National Electrical Code |
2002 |
| Internation Engery Conversion Code |
2003 |
Zoning Requirements: Montgomery County Zoning Ordinances
Building Envelope:
The building envelope is comprised of a 4” brick cavity wall tied into ½” Dens Glass Sheathing and R-13 batt insulation. The exterior walls extends passed the roof 3’-8” to create a parapet roof. The roof consists of a 1 ½” composite metal deck, 4” rigid insulation and TPO membrane.
Construction
Trammell Crow Company made Milestone Building #4 a competitive bid, inviting five general contractors to bid. Buch Construction was one of two finalists. Trammell Crow Company and Buch Construction have a guaranteed maximum cost contract with a 4% fee and will be delivered under a design-bid-build method. While Milestone Building #4 was in bidding phase, it was a non-LEED rated building. However, it was always the intention of Trammell Crow Company and Kennedy Associates to make the building LEED certified. The LEED design was noted as revisions in the drawings and was priced as a change order. Buch Construction invited three subcontractors of each trade to bid on Milestone Building #4. Awarding subcontract was primarily based on price and past experience. The construction schedule was set at 12-14 months in collaboration by Buch Construction and Trammell Crow. Buch Construction received Noticed to Proceed at the end of June 2007, which allowed substantial completion in September 2008. Due to permit delays, ground breaking was delayed until mid-September 2007 and a new substantial completion date was set for late October 2008.
Electrical
The main switchboard providing power is designed at 4000A, 277Y480V, 3f, 4 wire. For emergency power, there is a 350KW diesel generator located outside of the south wall. There are six transformers at 150KVA, while all others range from 15-45KVA.
Lighting
The first floor elevator lobbies and corridors, along with the restrooms are the only areas with lighting design. The lighting in the building is typically comprised of 277V fluorescent fixtures. The first floor elevator lobby consists of downlights, wall washers and customized surface mounted globes. The first floor corridors have 2’X4’ recessed parabolic fixtures and downlights are located in the restrooms.
Mechanical
The rooftop mechanical equipment is housed in the penthouse with a mechanical room located on each floor. The mechanical system is an air water system designed for 76°F/40%RH for summer months and 72°F for winter months. There are two 1700 GPM cooling towers located on the roof.
Structural System
The structural steel will be erected in four sections by a mobile crane. The steel was designed for dead, live, snow, wind and seismic load according to IBC an ASCE. All ‘W’ shapes are composed of ASTM A992 steel and all other shapes are conformed to ASTM A36. The structural steel is mainly made up of W21 or W16 shapes caring a 3 ¼” lightweight concrete slab on top a 3” metal deck.
Cast in place concrete is used for the foundation, SOG and elevated slabs. It will be placed directly (foundation and SOG) and by pump (elevated slabs). The footings and grade beams will use 3000 psi concrete and formed with plywood. The slab on grade is of 4000 psi while the elevated slabs are of 3500 psi. Concrete was designed to IBC, ASTM and ACI.
Milestone Building #4 will be ornamented with 4” masonry brick veneer to match Buildings #1 and #2 of Phase I. The primary brick pattern is ½ running bond, broken up with a soldier brick window head. The use of a tower scaffolding system will be incorporated on Building #4 and the brick veneer will be laid by elevation; south, west, north, east.
Fire Protection
Fire protection for Milestone Building #4 is a wet pipe sprinkler and standpipe system. The system includes automatic standpipes in both stairwells and quick response sprinklers with a maximum velocity of 20 feet per second. A fire pump is included in the system at 750 GPM, 75 Hp, 1,800 RPM, 105 psi, 460V, 3f. Fire protection system was designed to NFPA and IBC.
Transportation
There are four elevators providing vertical transportation in Milestone Building #4. Three of which are 3,500 pound, 350 FPM capacity and the fourth if 4,000 pound, 350 FPM. Two 5’-8” elevator pits are located under each set and the elevator mechanical room is located in the penthouse. The elevator mechanical room houses four elevator machines at 40 HP, 480V, 3f.
