14- to 17-foot-wide bolted sections to create the roof support assembly. This fully rigid structural skeleton was engineered for a 100-mph wind load. The overhead door ranks as the largest sup-
plied by Megadoor, Peachtree City, Ga., on a civilian hangar in North America. It is skinned with a translucent PVC-coated polyester fabric with UV inhibitors and fi re retardants that admit 10 percent of the ambient daylight into the interior. An unusual feature are the four 6-foot diameter exhaust venti- lation fans integrated into the solid bottom section of two of the individually operator door sections. The tight seals of the Megadoor units can resist the notorious windblown desert dust known for infi ltrating conventional bottom-rolling doors and had been proven to minimize the infi ltration on two previous installations at the airport. The wall and roof trusses, versus the custom-
ary welded three-plate columns and beams in the metal building systems industry, are more akin to a conventional steel structure and underscore the custom fabrication capabilities of CBC Steel Buildings, notes Brian Compton, the head of the erection company that operates in fi ve states. “This was certainly not the typical steel supplied
by a metal building manufacturer that I’ve seen so many times in my 50 years in the erection business,” Compton emphasizes. “This also was our fi rst experi- ence involving BIM, and it proved invaluable during live discussions about details with everyone involved with the job. BIM really improved communications and made it easy to reference details and resolve questions and procedures. With our fi rst experience with BIM, I’d say it is clearly the way to go on large or structurally complex projects.”
www.metalconstructionnews.com
The adequately sized site eliminated the need
for hot picks from the trailer loads of steel deliveries that were staged and erected from the ground using three mobile cranes. The wall truss columns were set and two opposing sections of roof trusses then lifted and joined into place to create one frame line per day, Compton says. His crew of 16 erectors fi nished clad- ding the building with the standing seam metal roof and metal wall panel systems in three months. At peak activity, the project had 145 workers in various trades and activities on the jobsite. Evaporative coolers were specifi ed to control
the hangar environment at 80 F. The Elamina- tor insulation system by Owens Corning, Toledo, Ohio, achieved the R-19 thermal barrier in the roof, while R-13 was specifi ed for the single-skin metal wall system assemblies. The lighting is primarily high-bay metal halide in the hangar space and a T-5 fl uorescent system in the offi ce area.
A record aircraft in the making The wingspan for the Stratolaunch Systems aircraft is 62 feet, which is greater than the infamous H-4 Hercules aircraft produced in the late 1940s that became referred to as ‘The Spruce Goose.’ The air-launch concept for multi-stage rockets
is envisioned as more effi cient than static pads for vertical launches of multi-stage booster rockets that were the mainstay of the original Space Race. The Mojave Air & Space Port presents a big pres- ence in what is steadily evolving into the epicenter for the Commercial Space Race. The facility was originally a U.S. Marine Corps fi ghter base during World War II and is undergoing aggressive rede- velopment with an emphasis on marketing sites to
aerospace companies and for open-air storage of retired commercial aircraft.
Jim Ladesich has more than 30 years experience writing about the construction industry as a free lance writer and marketing communications consul- tant. He earned a BS in Journalism at the Univer- sity of Kansas, where he also pursued graduate studies. He resides in a suburb of Kansas City.
Stratolaunch Systems Hangar at the Mojave Air & Space Port, Mojave, Calif.
General contractor: Wallace & Smith General Contractors, Bakersfi eld, Calif. Project architect: Teter Architects & Engineers, Fresno, Calif. Building erector: B.D. Compton, Santa Rosa, Calif. Concrete contractor: Baymarr Constructors, Bakersfi eld Engineer of record: Engle & Co. Engineers, Bakersfi eld Hangar door: Megadoor, Peachtree City, Ga.,
www.megadoor.com, Circle #35 Insulation: Owens Corning, Toledo, Ohio,
www.owenscorning.com, Circle #36 Metal building system: CBC Steel Buildings, Lathrop, Calif.,
www.cbcsteelbuildings.com, Circle #37
December 2013 METAL CONSTRUCTION NEWS 31
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