Hot Cities and Cool Roofs

(Originally published in the September 2011 issues of Merchant Magazine and Building Products Digest.)

This summer’s heat waves have been horrendous.  Hot weather is known as a silent killer and is responsible for more weather related deaths than tornados, hurricanes and blizzards, combined.  Summer days are hotter than they used to be, setting all kinds of records, but even worse are the hot nights.  Overnight lows are also setting records for high heat, making it much more difficult for at-risk populations, such as the very young and very old, to recover. 

In cities, the problem is worsened again by something called the Urban Heat Island Effect.  Cities are paved with asphalt and built up with concrete and other materials that absorb solar radiation during the day and re-radiate it during the night.  Cities can be 15° F hotter in the daytime and 22° F warmer overnight than neighboring suburbs.  More city heat means more air conditioning and more electricity consumed, leading to blackouts and, of course, more carbon emitted into the atmosphere. 

The heat island effect has been understood for a long time – I first learned about it in high school.  But more recent scientific knowledge indicates that we should expect more extreme heat waves like those this summer.  I’ve argued in this column and elsewhere (see our in-depth report, The Future of Home Improvement, here: www.williamverde.com), that dealers and distributors have an obligation to learn to anticipate changing climate and weather patterns in order to serve their communities, as well as boost their revenue.  In fact, as purveyors of building supplies, we are in a prime position to take the lead on mitigating the effects of hot summer nights and urban heat islands.

There are a variety of ways we can make our cities cooler, simply and affordably.  Replacing high thermal mass materials with trees and green space is one effective strategy and where we need to go, long term.  Living roofs are being boosted in major cities for just this reason.  But there’s another strategy that can deliver results in the short term, is less expensive, and offers opportunities for most dealers and distributors right now. 

Increasing albedo, or the ability of surfaces to reflect solar radiation, using special paints and coatings, or reflective roofing materials can dramatically reduce heat gain and electricity demand.  A white roof, for example, can reflect almost 90% of the sun’s radiation, reducing interior heat and the need for air conditioning.  And the savings are not trivial.  The White Roof Project (www.whiteroofproject.com) reports that about 10% of electricity produced by cities is used to compensate for the urban heat island effect.  If enough roofs were painted white, the nation could be saving billions of dollars and hundreds of lives.  And dealers could be doing well, while doing good.

Two excellent resources to help you stock appropriate roof coatings for your community, or improve your existing product mix, are Energy Star (www.energystar.gov) and Cool Roof Rating Council (www.coolroofs.org).  Keep in mind, reflective shingles and roofing tiles offer effective solutions for residential applications, too.  But don’t stop there.  Develop a promotional strategy that combines in-store materials with larger-scale efforts in the community.  In-store signage should educate customers, highlight rebate opportunities, and promote city-wide campaigns.  Get involved and get your manufacturers involved.  New York area dealers might ally themselves with the White Roof Project, for example.  Dealers in other sizzling cities might think about creating their own “white roof projects” in conjunction with local city agencies or non-profit organizations.  Last but not least, teach your staff about the urban heat island effect and the importance of taking measures to reduce it.  It can literally save lives.

THE Alternative Building Material

(This appeared in May '10, Merchant Magazine and Building Products Digest)

When I began thinking about this article and the various alternative building materials I could write about, several came to mind. But what counts for “alternative,” anyway? For example, there are products that are greener versions of old standbys like triple-glazed windows or FSC lumber. I could write about Serious Materials’ (www.seriousmaterials.com) innovative EcoRock drywall which they claim is 5 times more environmentally friendly than gypsum drywall, or Eco-Panels’ (www.eco-panels.com) super-efficient and well-designed structural insulated panels (SIPs). And then there are materials and methods that have thousand-year histories but aren’t mainstream, such as cob, which combines clay, sand and straw fibers usually sourced onsite. But these kinds of natural alternatives don’t usually require much of a supply chain. Instead, I’m going to highlight a building material that will blow your mind – hemp.

Industrial hemp used to be one of the most important agricultural products in the United States, but its cultivation has been illegal here for decades. (That may change soon - google Hemp History Week to learn more.) The Puritans brought it with them from Europe, many of our Founding Fathers grew hemp, and as recently as 1942, the government actively encouraged farmers to grow it. In those days, hemp was indispensable for making rope, cordage and sail cloth, and it yielded more usable fiber per acre than cotton or flax. Innovations in more recent times have demonstrated its value as paper and plastic feedstock, nutritive food ingredient, and biofuel. Cultivation can also bring benefits to farming communities as it delivers relatively quick, dependable yields without the use of pesticides or synthetic fertilizers.

Absolutely the coolest thing about hemp is that it’s being used to sequester carbon in an innovative new product called Tradical Hemcrete. It’s a combination of hemp shiv, which is the woody core of the plant, and a hydraulic lime binder. The components are mixed at the jobsite and packed into forms to make thermally efficient, breathable walls that could potentially last for hundreds of years. After its first US installation in the NauHaus, an innovative new home prototype designed by building science think-tank NauHaus Institute, (www.thenauhaus.com), there are now several more homes in the works.

Hemp Technologies, (www.hemp-technologies.com,) based in Ashville, NC, is the North American distributor of the product, importing it from England where it was originally developed. Greg Flavell, co-founder and hemp technology guru, said he discovered the product after searching for the most sustainable building material he could find. “I think this is it – it’s zero waste, non-toxic, breathable, mold resistant, durable, and is carbon negative, sequestering about 238 pounds of carbon per cubic yard,” he told me, adding “it’s also cost competitive.”

There are a few limitations, of course. The product is imported from England, where it was originally developed, because hemp isn’t yet grown domestically, nor are there easily sourced quantities of domestically produced hydraulic lime. The system is sold in two bags, Tradical HF and Tradical HB, which must be mixed at the jobsite by company-trained installers, though any contractor could easily master working with the material. In any case, those factors will slow widespread adoption of the material in the near term. However, Flavell says that they’re working on sourcing a little closer to home and developing a new panel system. Panels could dramatically expand the potential applications and make it easier for distributors and dealers to pick up the product. “We’re hoping to have panels available later this year,” says Flavell. If everything goes according to their plans, hemp could very well become less “alternative” and much more mainstream.

GHG and Retail

(This article appeared in the September '08 issues of Merchant Magazine and Building Products Digest.)

When the topic of green building comes up in our industry, it usually starts up the debate about certified lumber. SFI or FSC? Which is better? Is chain of custody certification worth the trouble? The questions are valid, but the debate is essentially over and has become a distraction from understanding the real issue driving the green building movement. Carbon. It may bring as much change to the hardware and building materials channel as the “big boxes” did decades ago. Let me explain.

The green building movement continues to gain solid support from state and local governments. Solid? San Francisco recently passed mandatory green building guidelines that are the most stringent in the nation, but it’s not another example of West Coast eccentricity. What’s driving the green building movement on the West Coast and the rest of the country isn’t some “tree hugger” ideology, but a science-based approach to curbing green house gas (GHG) emissions, which includes carbon dioxide.

The building industry accounts for nearly half of all green house gas emissions, which includes both embodied energy – the energy required to produce the building materials and move it to where its needed – as well as the energy required for operations, such as lighting, heating and cooling. (See www.architecture2030.com for more information on this, as well as really nice graphics that illustrate the depth of the issue.) Cities and states are focusing on green building related policies as one strategy for limiting GHG emissions because that’s the sweet spot.

A major component of every green building program concerns energy usage. Adding renewable energy, like solar or wind, can earn a building project lots of green points. So too, can adding a host of energy saving features. While federal rebates for solar may end soon, most pundits predict a future that includes more rebates for renewables and energy saving products, coupled with ever stricter building codes. In fact, there is a movement afoot to set the green building standard at carbon neutrality, or zero-energy, well before 2030.

This increasing focus on energy and carbon reduction will create business opportunities and threats. Ikea recently announced their intention to sell solar panels and other home energy products in the next five years. Is this a sign of some big changes headed for this retail channel? Could be. New products in the pipeline will make it easy for do-it-yourselfers to install small-scale solar and wind systems for room additions, out buildings, etc. There’s lots more new energy saving products coming our way, too. Because these products deliver big margins, it’s attracting the attention of retailers like Ikea. And because “alternative energy” is becoming mainstream, established “alternative energy” retailers, such as Northern California’s Real Goods, are seeing tremendous growth opportunities. It’s a sure bet that in the years ahead there will be new retailers focused on meeting the demand for carbon-free energy and challenging traditional home improvement/hardware dealers in that category.

What will all this mean for traditional home centers and building materials retailers? For those that are energy savvy, the new wave of carbon-busting products will add growth to the bottom line. Retailers today that have a solid lineup of Energy Star products and, perhaps, a relationship with a solar installation outfit, have a head start and will be well positioned to take advantage.