2012 has ushered in a new era of building code changes, with the enhancements focused primarily on higher levels of energy efficiency. Their impact on the construction industry as a whole and the roofing industry are quite significant. Perhaps the most noteworthy are those prescribed in the 2012 International Energy Conservation Code (IECC), which calls for buildings to achieve a 30% increase in energy efficiencies over the 2006 IECC. This sixth edition of the code illustrates the growing importance of ensuring that all buildings are achieving high levels of energy efficiency in congruence with model building codes such as the IBC (International Building Code.)
According to the International Code Council (ICC), this comprehensive set of changes includes measures to improve the building envelope, HVAC systems and electrical systems of residential buildings up to three stories in height. Commercial building enhancements include required energy efficiency for windows, doors, skylights and the building envelope; and increased efficiencies for installed HVAC equipment, among others.
The new International Green Construction Code (IgCC), is an overlay code set to be published in the Spring of 2012. The IgCC is the first green building code developed in the ICC code development process. The IgCC is designed to reduce the negative impacts of the built environment on the natural environment. It was created by a broad-based committee with experts in such areas as government, business, academia, code development/enforcement, engineering and environmental advocacy.
The IgCC will go beyond traditional life/safety model codes and simulate some voluntary program requirements for commercial buildings to provide both safe and sustainable buildings. Thus, it will be used to incorporate sustainable practices within existing building codes at the state and/or jurisdictional level.
Of interest to the roofing industry are a number of provisions in the energy code. The IECC calls for the increase of insulation for low-slope roofs with above-deck insulation. This is important as insulation plays an important role in reducing a building’s energy use. The code’s prescriptive R-value and U-value requirements for above deck insulation by climate zone are simple and straightforward. (R-value is the measure of thermal resistance used in the building; U-value is measure of the rate of non-solar heat loss or gain (flow) through a material or assembly.)
The 2012 IECC code language also details solar reflectance and thermal emittance requirements and options for low sloped roofs in southern climate zones in addition to the minimum thermal resistance (in both R-value and U-value) of the insulating material required in roof assemblies.
Also making news later this year is the anticipated release of LEED 2012, the next version of the LEED rating systems. The 2012 version is still in draft, but indications are it will favor a more holistic and life cycle approach for products installed in LEED certified buildings and assemblies; and will reward transparency for sustainable manufacturing, socially responsible raw materials sourcing, and use of products with low VOC (volatile organic compounds) emissions.
While a detailed review of LEED 2012, IECC and IgCC are beyond the scope of this article, these new or revised codes and programs reveal the shift towards increased energy efficiency and environmental awareness not seen in previous versions of code. These objectives reinforce the overall importance of high-performance roofing systems as part of the building envelope. Now more than ever, a well-insulated and well protected roof is critical in new or renovated commercial buildings.
Beyond the pragmatic need to maximize energy efficiencies, code and program language is defining a roof’s emerging new role. Commercial roofs have become multi-use platforms that house a myriad of renewable energy systems and environmental features, such as photovoltaic (PV) and vegetative roofs.
These emerging assemblies, while enhancing the environmental and energy performance of a building, have added considerably to the foot traffic of the modern commercial roof. By definition, the very function of a roof is to protect the building and its contents. When additional equipment, PV panels or vegetation are installed and need to be maintained, it means more frequent foot traffic overall. These types of roof assemblies will bear a more taxing load that could stress the roofing systems beyond their normal capabilities. Add to that the economic risk that leaks, cracks and other damages could impart, and the value and importance of sustainable, durable and high-performing roofs grows exponentially.
As the new and revised codes prescribe, roofing systems are more complex and require more protective measures to increase its durability. The right premium cover board will help maintain the strength, durability and energy performance of a roofing system, allowing it to perform better, last longer, protect the building owner’s investment and support the tenants’ daily needs. Cover boards just take on added importance, given the added costs and complexity of the systems they protect and the potential consequences of a failure.
While a number of roof cover board materials are available to contractors, fiberglass-mat gypsum roofing boards, such as DensDeck Roof Boards for example, have proven to be effective. For more than 25 years, DensDeck panels have been shown to withstand delamination, deterioration, warping, and job site damage better than paper-faced gypsum board or other conventional roofing products, such as wood fiberboard and perlite.
Whatever roofing system you choose, be certain to select a durable cover board to protect the insulation needed for energy code and building program roof assembly R-values. While the prescriptive R-values vary by climate zone, every code or program requires some level of continuous insulation above the deck. The greater the insulation, the more roof protection makes sense. BD+C
Related Stories
Building Technology | Jun 18, 2024
Could ‘smart’ building facades heat and cool buildings?
A promising research project looks at the possibilities for thermoelectric systems to thermally condition buildings, writes Mahsa Farid Mohajer, Sustainable Building Analyst with Stantec.
University Buildings | Jun 18, 2024
UC Riverside’s new School of Medicine building supports team-based learning, showcases passive design strategies
The University of California, Riverside, School of Medicine has opened the 94,576-sf, five-floor Education Building II (EDII). Created by the design-build team of CO Architects and Hensel Phelps, the medical school’s new home supports team-based student learning, offers social spaces, and provides departmental offices for faculty and staff.
Healthcare Facilities | Jun 18, 2024
A healthcare simulation technology consultant can save time, money, and headaches
As the demand for skilled healthcare professionals continues to rise, healthcare simulation is playing an increasingly vital role in the skill development, compliance, and continuing education of the clinical workforce.
Mass Timber | Jun 17, 2024
British Columbia hospital features mass timber community hall
The Cowichan District Hospital Replacement Project in Duncan, British Columbia, features an expansive community hall featuring mass timber construction. The hall, designed to promote social interaction and connection to give patients, families, and staff a warm and welcoming environment, connects a Diagnostic and Treatment (“D&T”) Block and Inpatient Tower.
Concrete Technology | Jun 17, 2024
MIT researchers are working on a way to use concrete as an electric battery
Researchers at MIT have developed a concrete mixture that can store electrical energy. The researchers say the mixture of water, cement, and carbon black could be used for building foundations and street paving.
Codes and Standards | Jun 17, 2024
Federal government releases national definition of a zero emissions building
The U.S. Department of Energy has released a new national definition of a zero emissions building. The definition is intended to provide industry guidance to support new and existing commercial and residential buildings to move towards zero emissions across the entire building sector, DOE says.
Multifamily Housing | Jun 14, 2024
AEC inspections are the key to financially viable office to residential adaptive reuse projects
About a year ago our industry was abuzz with an idea that seemed like a one-shot miracle cure for both the shockingly high rate of office vacancies and the worsening housing shortage. The seemingly simple idea of converting empty office buildings to multifamily residential seemed like an easy and elegant solution. However, in the intervening months we’ve seen only a handful of these conversions, despite near universal enthusiasm for the concept.
Healthcare Facilities | Jun 13, 2024
Top 10 trends in the hospital facilities market
BD+C evaluated more than a dozen of the nation's most prominent hospital construction projects to identify trends that are driving hospital design and construction in the $67 billion healthcare sector. Here’s what we found.
Adaptive Reuse | Jun 13, 2024
4 ways to transform old buildings into modern assets
As cities grow, their office inventories remain largely stagnant. Yet despite changes to the market—including the impact of hybrid work—opportunities still exist. Enter: “Midlife Metamorphosis.”
Affordable Housing | Jun 12, 2024
Studio Libeskind designs 190 affordable housing apartments for seniors
In Brooklyn, New York, the recently opened Atrium at Sumner offers 132,418 sf of affordable housing for seniors. The $132 million project includes 190 apartments—132 of them available to senior households earning below or at 50% of the area median income and 57 units available to formerly homeless seniors.
