Architects Smallwood, Reynolds, Stewart, Stewart & Associates (SRSS) of Atlanta needed to specify a weatherproofing sealant with excellent adhesion that would not stain the granite panels inlaid into the building's 21-story glass curtainwall. General contractor Hardin Construction had a very short build-time and wanted to make sure the job got done on schedule with high-performance sealant products that had a solid track record for durability.
"We had not used 756 SMS before," said Demetre Rizopoulos, the SRSS architect responsible for construction administration on the project. "JAMCo recommended it, the AAMA 501.1 water test was performed and everything passed."
According to JAMCo Project Manager Bill Hahn, the company sent substrate samples to the Dow Corning Lab for adhesion testing prior to the start of the job after their Dow Corning representative first suggested it for the project. JAMCo then recommended the sealant as an alternate to the specification for 171 17th Street Building, the first tower to go up in a large mixed-use development known as Atlantic Station.
Field testing for cohesive failure was performed when the installation was about 50% complete. Three water tests were also performed later as the project neared completion. SRSS witnessed both the pull tests and the water tests.
"JAMCo uses Dow Corning products exclusively for our silicone needs," he said. "We're very pleased to add 756 SMS to our lineup."
The sealant received good reviews from the field as well. "I like 756 SMS," said Mike Allen, site superintendent for Alpha Insulation and Waterproofing, a subcontractor to JAMCo. "It skins quickly and bonds great to stone and metal. It has excellent adhesion and nothing required primer."
Alpha's 12-person crew applied about 2,000 gallons of gray 756 SMS Sealant to the building's exterior perimeter joints. It took about five months to weatherseal the nearly 60,000 square feet of granite panel inlays. The building was completed in April 2004.
"We specify Dow Corning sealants on all our projects because they have a proven track record," said Rizopoulos. "We find products that work and stick
Located in the heart of Atlanta, Atlantic Station is a "live-work-play" urban redevelopment project that will eventually encompass 138 acres. It will provide a mix of middle-income and upscale housing for 10,000 residents; world-class restaurants, theaters and retailers; and over six million square feet of office space.