Carnegie Mellon

Precious Art and Book Collection Finds Sustainable, Secure Home Under Green Roof

SITUATION: Carnegie Mellon University's Posner Collection of rare art and books had for years been stored in a remote library location. Thanks to a donation by the Posner family, the university was able to create a new location to house Henry Posner, Sr.'s collection, which includes one of the four remaining original copies of the Bill of Rights. When it came time to consider how to exhibit this collection, project planners had an epiphany: why not pick a location that could incorporate many environmentally sustainable features as well? Architects were on a mission to find a way to create an environmentally friendly location that could protect one of the top five privately held collections in the world.

Vinyl as the Durable Roofing Solution

The University's desire to integrate green space into the chosen construction site, a high-traffic campus crossroads, led architects to design an 11,400-square-foot, one-story subterranean building carved out of a hillside. The structure would quite literally be buried between two large classroom buildings and feature at surface level a vegetative roof to satisfy the University's landscape plan.

The Posner family liked the idea of a green roof; the only stipulation they put on the underground building was that the roof be strong enough to protect the rare collection and never leak. Such stringent design specifications demanded that architects identify a waterproof roofing material both impervious to root growth and highly durable.

Construction plans for Carnegie Mellon University's Posner Center involved adhering an 80-mil, G-476 Sarnafil membrane on top of the building's concrete roof deck and portions of its vertical side walls. A protection layer, a drainage panel and insulation were then installed over the membrane.

While workers waited for warmer weather to arrive so they could install the rooftop garden, the durability of the vinyl roofing system was put to the test. The roof sat exposed to the elements through the winter, and endured two 100-year rainstorm events. The waterproof membrane aced all of these tests.

With ample gallery space, a state-of-the-art conference center and a beautiful rooftop garden, the 1,000-volume Posner Collection today has found a home that is secure, environmentally friendly and appealing to the eye.


Durability Case Studies and Testimonials

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Sustainability Vinyl Roofs

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Aesthetics Vinyl Roofs

PVC membranes' aesthetic qualities make them the choice for any roof design. Find out why PVC is recommended for projects with aesthetic considerations here »


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    “When we bid out the project using metal on the roofs, it came in over budget. The green color of the Sika Sarnafil vinyl roof gave us the look of aged copper which was exactly what we had in mind. More importantly, the owners would get the long-term, proven performance they required,” – Robert Marz, president, Roth Marz Partnership.