Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
Photo courtesy of Tremco Inc., Beachwood, Ohio
San Francisco International Airport has made clear its dedication to the environment. Its 2005 annual review provides examples of the airport's efforts, including increasing the number of airport vehicles that use clean power and reducing post-emergency pesticide and herbicide use.
So when United Airlines decided to replace the 20-year-old roof system on its maintenance facility—which had been experiencing leaks—at San Francisco International Airport, energy efficiency was an important factor. United Airlines also wanted a durable roof system that effectively would protect the daily operations inside the facility.
Western Roofing Service, San Francisco, a Tecta America company, was chosen to remove and replace the building's existing built-up roof (BUR) system.
Compliance
The maintenance facility's existing roof was 1,100 squares, and the roof assembly consisted of a metal deck and rigid board stock insulation covered with a BUR system and gravel. The existing roof was torn off in sections down to the deck.
United Airlines decided to install another BUR system because the existing system had performed well and resisted a considerable amount of service traffic. United Airlines chose a four-ply BUR with a gravel surface to cover the 110,000-square-foot area.
"We installed Johns Manville 3-inch-thick perlite insulation mechanically attached to the steel deck and a base ply of coated fiberglass felt, as well as three plies of Type IV felt—all adhered in hot asphalt," says George O'Neill, senior vice president of Western Roofing Service.
"We spray-applied 5 gallons per square of Tremco Inc.'s solvent-based white Rock-It Adhesive and added 200 pounds per square of white roofing gravel, which provided United Airlines with a Title 24-compliant roof," he continues.
California's Title 24 states that to qualify as a cool roofing product, roofing products must be rated, labeled and certified according to the Cool Roof Rating Council's system. The maintenance facility's Title 24-compliant roof meets minimum 0.70 reflectivity and 0.75 emissivity ratings.
To address safety concerns, perimeter safety railings were attached to the side of the building using metal posts and steel cables.
Security concerns also were an issue. During the project, all workers and field personnel had to submit appropriate identification documentation to United Airlines and airport authorities before gaining access to construction areas.
Because the project was being performed in a sensitive location, Western Roofing Service faced a special challenge.
"There was concern about interior protection during the project," O'Neill says. "Jet engines were being rebuilt below, and we had to make sure dust and debris did not fall below the roof system. To solve the problem, we worked with United Airlines facilities staff to install tarps daily beneath the deck sections where tear-off activity took place."
Something new
The energy-efficient project held some novelty for Western Roofing Service.
"The installation of the white gravel and Tremco adhesive was a rather new process and one we never have used before," O'Neill says.
O'Neill says Western Roofing Service can be proud of a job well done.
"It was satisfying to see a completed roof system that met all the clients' requirements," he says.
Krista Reisdorf is managing editor of Professional Roofing magazine.
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