Denver, Colorado (8/6/2002) --- Commercial Roofers, Inc. (CRI) of Las Vegas, Nevada selected a Johns Manville APP Modified Bitumen System and an UltraGard® TPO System to roof the 240,000 square foot west expansion of Fashion Show in Las Vegas because JM offered a single guarantee to cover the entire roof. "Johns Manville was selected for this project because they have both types of roofing systems available under a single warranty," said Bruce Martin, Senior Project Manager for Commercial Roofers.
The Fashion Show Mall expansion is a high profile project that will be completed in two phases. The current phase will open on November 1, with a new Bloomingdale's Home and Nordstrom and 175,000 square feet of small store retail. The East expansion will open in October 2003 with a new Lord & Taylor, a Las Vegas Boulevard plaza featuring dining and entertainment experiences, and a new food court. The 1.9 million square foot Fashion Show, upon completion, will be one of the largest shopping centers in the nation with eight anchor tenants under one roof. The Rouse Company of Columbia, Maryland is the owner and developer of Fashion Show.
The method used to determine long-term R-values is based on accelerated aging by conditioning thin slices of foam insulation and is based on consensus standards in both the United States and Canada. On July 1, 2002 JM and other manufacturers will discontinue publishing figures from the PIMA 101 standard in Canada. The date for the elimination of PIMA 101 numbers in the United States is January 1, 2003.
In bidding the job, CRI knew they needed to provide a functional long-lasting roofing system that also was cost effective. The Las Vegas fire regulations dictate that the lower areas of the roofs have to have a two-hour fire rating. This was achieved cost effectively using an ElastiCell insulating concrete roof deck poured over the metal decking.
"We chose an JM APP modified system for these areas using the Ventsulation® felt for the base sheet, APPeX™ 4S modified bitumen sheet and the APPeX 4.5M FR modified bitumen sheet torched," Martin said. "The owner and we felt that this system would hold up under the large amount of foot traffic that is present during and after construction. Massive amounts of air handling equipment and duct work are present on the roof."
The upper roof area was sufficiently high and did not require the more stringent two-hour rating. In this case the JM 45 mil UltraGard TPO single ply membrane was installed over one layer of ISO 1™ roof insulation. TPO was a cost effective and aesthetically pleasing choice. CRI also installed a layer of 10-mil polyethylene over the vent metal decking to reduce ballooning of the mechanically attached TPO. Torch applied systems were selected because of limited access at the site. Six anchor tenant buildings and a parking garage were being built as the same time as the mall expansion. This made setting up kettles and hot asphalt impractical. The torch applied and single ply systems allowed work to proceed without the normal restrictions caused by asphalt kettles and transporting hot asphalt across the roof.
"I think everyone was pleased that it was possible to have two roof areas serving different functions and using different roofing systems, but with a single source for all of their materials and guarantee," said Joe Buffalino, the JM representative who handled the modified bitumen portion of the roofing area and made daily inspections to the site. The other representative on the project was David Ward who provided the TPO system.
The project had nearly 500 roof curbs and approximately 300 pipe penetrations. However, this did not present a challenge for CRI. The company was founded by Dennis Conway and Scott Howard in 1996 and has annual sales in excess of $16 million. They specialize in large projects in the Las Vegas Valley. They have worked on projects such as the Mandalay Bay Hotel and Casino, MGM, Paris Hotel and Casino, Caesars Palace and Bellagio Hotel and Casino.
On the Fashion Show they used different crews for each phase of the project. The operations manager on the project was Dennis Perry and the superintendent was Randy Koivu. The general contractor was The Whiting-Turner Contracting Company.
"Our field and office personnel worked together very well on the Fashion Show project considering the different systems required and the coordination with the other subcontracting trades," said Dennis Conway. "The roofing systems were the right systems for this high profile job with one manufacturer providing the guarantee for both systems."
Johns Manville, a Berkshire Hathaway company, is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has sales in excess of $2 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs approximately 9,500 people and operates 52 manufacturing facilities in North America, Europe and China. Additional information can be found at www.jm.com
