May 2008 Archives

Not all solar installations have to be on the rooftop...or even permanent in one place.  Take this new desk design:

The SOLo Lounge Table might change the working habits of teckies. Built into the surface of this roll-around table are solar panels that charge up its internal battery and power your devices. It can connect to a variety of devices and there’s a drawer for storing and charging your gadgets. The SOLo alse features Bluetooth connectivity for system monitoring in addition to the included System Monitor display/device. More info here.

True smart water management technology is the most effective way to achieve LEED certification (by USGBC)  for outdoor water conservation.

Although a wide range of irrigation technologies are marketed as being smart, genuine smart water management systems are differentiated by:

• No people involvement, because all irrigation activity is determined and executed by the system
• Low maintenance costs, unlike systems based on sensors and temperature gauges
• Ideal for both new construction and retrofitting, since they don't require the implantation of sensors, gauges or other in-ground equipment.

Beyond providing a straightforward path to LEED certification for outdoor areas, smart water management technology delivers a full complement of business and environmental benefits.

• Water savings for cost reduction
• Water savings for environmental impact
• Reduced risk by not damaging or creating slippery surfaces on hardscapes.
• Healthier landscape plants with scientifically scheduled watering to protect living assets

According to WeatherTRAK, landscape irrigation systems based on this technology are 30 percent more efficient than traditional low-tech watering systems, speeding payback and eliminating infrastructure investments.

In California, AB 2717 and AB 1881 mandate that new construction include a weather based smart controller by 2012 and that cities/municipalities adopt smart irrigation by 2010.  Other Southeastern states heavily impacted by recent droughts and water shortages are following California's legislative approach.

By Julie Gevrenov, environmental engineer with EPA

Recycling markets for post-consumer asphalt roofing shingles (tear-offs) are starting to gain ground. The blossoming green building movement, emphasis on environmental stewardship, increasing oil prices, aggregate shortages, efforts to decrease greenhouse gas emissions, state recycling programs and regulations, local recycling ordinances, increasing tipping (disposal) fees and difficulty choosing sites for new landfills are some drivers pushing recycling of construction and demolition materials into the limelight.

In addition, the U.S. Environmental Protection Agency's (EPA's) Resource Conservation Challenge is drawing attention to reuse and recycling of construction and demolition materials.

According to the Construction Materials Recycling Association (CMRA), an estimated 11 million tons of asphalt roofing shingles are generated annually in the U.S., and some estimates are higher. Compared with other construction and demolition materials such as metal, concrete and asphalt pavement, only a small percentage of asphalt shingle tear-offs are currently recovered, leaving significant opportunity to use recycled asphalt shingles.

The primary use for recycled asphalt shingles in the U.S. is as a road building material, particularly for use in hot-mix asphalt. Other uses of recycled asphalt shingles include cold-mix asphalt, cold patch, road base, dust control, mulch, temporary roads and fuel.

The benefits derived from using recycled asphalt shingles stem from the recovery of asphalt cement and mineral aggregate components of shingles, each of which represent about 20 to 40 percent of a shingle's weight. With the price of oil at an all-time high and aggregate shortages being experienced in some areas of the U.S., there are obvious reasons to investigate opportunities to recycle shingles.

Resources

Check out www.shinglerecycling.org, a comprehensive clearinghouse of information about the subject.

The Web site includes overviews of shingle recycling in each state (including state regulations, environmental agency contacts and all known recyclers), economics of recycling, markets for recycled shingles, pertinent environmental regulations, worker health and safety issues, a library of literature on shingle recycling and current research.

Environmental issues

Environmental Issues Associated with Asphalt Shingle Recycling discusses two main environmental concerns: asbestos, which occasionally is found in the fiberglass or felt mat of shingles, and polycyclic aromatic hydrocarbons (PAHs), which occur naturally in asphalt products.

Best practices

Recycling Tear-Off Asphalt Shingles: Best Practices Guide provides a starting point for shingle recyclers to plan a new operation or improve an existing one. It focuses on business planning, recycling operations, marketing strategies and compliance recommendations and identifies three major best practices, each with a number of supporting points:

1. Recyclers should implement quality-assurance and -control systems to carefully control the quality of their incoming supplies of shingle tear-off materials.
2. Recyclers' end product, recycled asphalt shingles, should meet or exceed material specifications of their end markets.
3. A recycler's business plan should include a marketing plan based on multiple outlets for recycled asphalt shingles.

Economic Issues

Shingles are heavy, making transportation a limiting factor in any recycling project. The recycling tipping fee must be cost-competitive for a roofing contractor to choose recycling instead of disposal. Likewise, a recycled asphalt shingle product must be priced competitively because end-users are more likely to choose a nontraditional or recycled product if it will save them money. And finally, preference for using recycled asphalt shingles varies among hot-mix asphalt plant operators.

Materials specifications also are critical for market development. State department of transportation (DOT) specifications often are relied on by county and local public works engineers and used on private jobs and DOT projects. However, only a handful of state DOTs (Georgia, Missouri and South Carolina) currently have specifications for using recycled asphalt shingles in hot-mix asphalt.

Other states (Indiana, Massachusetts, Minnesota, North Carolina, New Jersey, Pennsylvania, Texas and Virginia) have specifications for the use of manufacturers' shingle scrap in hot-mix asphalt though the volume of available manufacturers' scrap is insignificant compared with the volume of shingle tear-offs generated annually.

How to Recycle Shingles in YOUR State

Recycling presents great environmental stewardship opportunities for the roofing industry. If you are interested in recycling asphalt shingles, research the resources currently available in your state, including state specifications.

You can find this information and key contacts for your state agencies at www.shinglerecycling.org under the State Experience section. Your state regulator will help you learn what can be recycled in your state and how to do it. If you want to start a recycling operation, don't learn by trial and error—you can refer to the best practices guide to glean the cumulative wisdom of the pioneers of asphalt shingle recycling.

Remember, you may be able to reduce your disposal costs by keeping asphalt shingles and other construction and demolition materials out of landfills. And substituting reused or recycled materials in place of virgin materials can result in substantial energy savings and greenhouse gas emissions reductions—and you can make that happen.

Shingle Recycling Business Opportunity

So where's the business opportunity in shingle recycling? On the front end, you obviously can save money by recycling if a recycling tipping fee compares favorably with costs of local landfill tipping fees.

But what about recyclers and end-users, particularly hot-mix asphalt producers? In general, most private companies don't want to discuss their operations, and because local conditions such as tipping fees vary widely, no single example can be representative of all operations.

But a hypothetical, conservative scenario can help reveal some information.

Assuming the asphalt shingles torn off a roof system are 20 percent asphalt, the price of liquid asphalt cement is $300 per ton and about 75 percent of the asphalt in the shingles is "available" to replace virgin asphalt cement in hot-mix asphalt, then the value of the asphalt in the recycled asphalt shingles is about $45 per ton.

If we assume a recycler and hot-mix asphalt producer split the value of the recycled asphalt shingles, $22.50 per ton is paid to the recycler less about $15 per ton for processing and transportation costs, leaving the recycler with about a $7.50 per ton profit on the processing side of the operation alone.

Profitable recycling ventures need revenue from their tipping fees as well as from the sale of recycled materials. If a recycler sets his tipping fee for asphalt shingle tear-offs at 50 to 75 percent of the landfill tipping fee, there is a financial incentive for people to recycle.

EARN:  Sale of Recycled Materials

Presorting Shingles

Recycling Tear-Off Asphalt Shingles: Best Practices Guide (which is available for FREE at www.shinglerecycling.org) explains that presorting can be done quite reasonably by roofing contractors—the goal isn't to remove every last nail from the shingles but to keep wood, plastic and other debris in separate piles.

With the price of petroleum-based products at an all-time high, this conservative, back-of-the-envelope estimate shows that shingle recycling can be quite profitable.

ROI for Roofing, Recycling and Paving

And the economic and environmental benefits are shared across the roofing, recycling and paving industries.

Julie Gevrenov is an environmental engineer with the U.S. Environmental Protection Agency's Region 5 office in Chicago.

READ MORE: Professional Roofing