The Roof System
Challenges on the 300-square project included limited roof access. A crane could not be used to load the roof, so getting material up to the roof was a chore. “Everything had to be taken up the elevator and then up one flight of stairs,” said Beeck. “It was very labor intensive. We brought material up every day.”
There were also numerous penetrations, which Beeck acknowledged were the toughest part of the project. “There’s more equipment up there than anyone can imagine,” he said. “Air conditioners, air handlers, vents — it was jam-packed with equipment.”
The new system specified included membranes from Polyglass USA, Inc., beginning with its Elastoflex® SA V FR base sheet. Polytherm® 3.1-inch iso insulation board was adhered with Dow InstaStik adhesive to achieve an R value of 19. Half-inch Securock served as the cover board, while quarter-inch DensDeck Prime was used on the vertical curbs. The system was then topped with one ply of Polyglass’ Elastoflex SA V FR base, a self-adhered, SBS modified bitumen base sheet that features patented ADESO® Dual Compound Technology. Polyflex® G FR, a polyester-reinforced, APP mod bit granulated cap sheet, was then torch-applied to finish the job. It is available in ten colors, and white was chosen for this project.
“Because of all the penetrations, this system was a very good choice,” Beeck said. “It was easy to flash. It’s a very flexible product and it was easy to move around penetrations. It works very well around corners, up walls, in situations like that.”
The self-adhered base sheet also saves time, Beeck noted. “It goes pretty fast as long as you’ve got it lined up right.”
http://www.roofingcontractor.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000001102681
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