What does it take for gymnasiums or buildings with wide-open interior spaces to achieve a platinum certification under the Leadership in Energy and Environmental Design (LEED) rating program? With a floor area of 700 m2 (7500 sf) and a ceiling height of 7.3 m (24 ft), a typical high school or junior college gym has a vast interior space to heat or cool—approximately 5100 m3 (180,000 cf) of volume—so an ultra-energy-efficient envelope is crucial.1
In the last two decades, the improved technologies of silicone, acrylic, and polyurethane have become better integrated into basic roofing practice, not only expanding the range of roofing applications but also competing successfully against the traditional asphalt coatings used for maintaining traditional built-up (BUR) roofs. Today, most manufacturers of entire roof assemblies also have a coatings line, including at least two of these four technologies.
This was supposed to be simple. The site is flat and the building is all slab-on-grade. The geotechnical report stated the design ground water table is more than 3 m (10 ft) below grade. Why is there a need to spend in excess of $100,000, and add more than three weeks to the construction schedule for below-grade waterproofing? The short answer is: elevators.
Insights regarding the function and design of air and water control layers in modern, high-performance building enclosures are presented in a new e-book, Protecting Against Water Intrusion, from The Construction Specifier.