Green Roofs - Living Architecture Monitor - Spring 2011 - (Page 12)

INNOVATION Before After THE BLACK ARTS NEW TRENDS IN ROOFING SYSTEMS AND DESIGN By Bill Foley F or over 15 years the commercial roofing industry trends have leaned toward cool and sustainable roofing. Both mainstream concepts are endorsed and supported through the U.S. Department of Energy (DOE), Energy Star®, U.S. Green Building Council and through other industry groups and government bodies. As the “black arts” continues to refine and develop objectives for cool and sustainable roofing, new government standards, regulations and incentives to encourage, or mandate, the use of energy-efficient and sustainable roofing systems are being developed. High-performance buildings have become the new benchmark in the built environment. The DOE defines their benefits and objectives as follows: • Energy consumption reductions of 50 percent or more; • Reduced maintenance and capital costs; • Reduced environmental impact; • Increased occupant comfort and health; and • Increased employee productivity. High-performance roofing systems will contribute significantly toward all of these objectives. Below are some new or evolving trends to meet high-performance goals through roofing material selection and roofing system design. RECYCLED CONTENT Not a new trend, but a growing part of the roofing industry’s norm to reduce environmental impact in order to meet specific project requirements. Both the cost of procurement and risk of using recycled materials in lieu of raw materials have favorably improved. Post-consumer rubber is routinely used as a modifier in asphalt blends for fluid applied and sheet membrane roof materials. Other examples of recycled content include solvents, fiberglass and various plastics reused in new roofing materials. BIO-BASED SOLUTIONS The recent price increases in crude oil exponentially raise the price of asphalt, synthetic rubber and virtually all petroleum based polymers and ensures bio-based roofing solutions will see tremendous growth. For environmental and fiduciary reasons, the race is on to find renewable resources for plant-based oils to substitute for petroleum. Some federal agencies are required to purchase bio-based products over their petro- leum-based counterparts, as long as the biobased products are reasonably available, priced and comparable in performance. This procurement push is designed to: • Increase national security by lessening dependence on foreign oil; • Create new jobs for rural communities; • Provide new markets for farm commodities; and • Reduce environmental impacts through the use of non-toxic, renewable resources. “BioPreferred” is a procurement program managed by the U.S. Department of Agriculture for federal agencies and their contractors, as well as a voluntary labeling program for the broad-based consumer marketing of bio-based products. The federal government's designated BioPreferred categories currently include roof coatings formulated for use in commercial roof deck systems to provide a single-coat monolithic coating system. The specification requires a minimum of 20 percent bio-based content. Start-up companies are already marketing fluid applied bio-based urethane coatings that are waterproof and suggested for complete “green roof” systems. 12 LIVING ARCHITECTURE MONITOR SPRING 2011

Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Spring 2011

Green Roofs - Living Architecture Monitor - Spring 2011
Contents
Adaptation Through Innovation
Award-Winning Leader
Living Building Challenge Update
On the Roof With...
The Black Arts
Green Walls
Stormwater Policy
Root Repellent Standards
Growing Media
Green Building Codes
New Corporate Members
The GRP Turns Two
Professional Calendar
My First Year as a GRP

Green Roofs - Living Architecture Monitor - Spring 2011

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