structural elements; external envelope
Kemper System answers towering challenge in New York
building in the Western hemisphere: the 1,776ft One World Trade Centre in New York. Rising to 104 storeys and constructed in a
K
$3.9bn project lasting more than a decade, the One World Trade Centre, also known as the “Freedom Tower” is the centrepiece of the re-built World Trade Centre complex constructed on the site of ground zero. The 1800m2
roof is not only extremely high, but
also features extensive exposed steel details and up to 400 penetrations, including the spire, with no area larger than 10ft x 10ft without some form of penetration; all of which had to be sealed effectively using a system that could be applied by a small team, with restricted access and without the use of hot works or heavy equipment. Kemper System’s Kemperol 2K-PUR
emper System’s Kemperol 2K-PUR cold liquid applied membrane has been used as the waterproofing system for the tallest
liquid-applied resin membrane was specified for the main roof and the louvre areas on lower floors. The penetrations, drains, curbs and perimeters were all protected and then overlapped by the membrane in the larger expanse to provide a seamless, durable and reinforced waterproofing membrane across the entire roof. As the cold-applied resin bonds directly to the substrate it is particularly effective in coping with wind- uplift which was a major consideration for the chosen system. In line with US Building Code requirements,
the system was completed with a white reflective coating to reduce the urban heat island effect. Kemperol 2K-PUR resin system is 80 per cent
from renewable materials, which fit with the overall design goals for the project. Nearly 75 per cent of 1 WTC is made from recycled or eco-friendly building materials, and the building’s green design earned LEED Gold Certification.
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01925 445532
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www.rooflight.co.uk
T: 0191 273 7738 F: 01670 738080
sales@rooflight.co.uk
standard and bespoke architectural rooflights and roof glazing
With many years of experience in the commercial and domestic markets, Rooflight Architectural can manufacture and supply, lantern lights, pitched glazing and walk-on rooflights to any size or specification. We offer technical advice, CAD drawings and nationwide installation.
• Any size • Any colour • Electric or manual vents • Many glazing options • Structural aluminium sections
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