Published on June 12th, 2008
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Editor’s note: Drywall isn’t the sexiest of subjects, but, as our friends at GreenBuildingTalk note, it’s the most used interior building material out there… and also has a substantial environmental footprint. Serious Materials new EcoRock product is attracting attention among a number of audiences… including investors. This post was originally published on Wednesday, June 4, 2008.
Serious Materials, an indoor building material manufacturer, successfully raised an impressive $50 million in late 2007 to support its efforts in bringing it’s new green dry wall product to the marketplace. The venture capital funding is in response to Serious Material’s 2006 research and development success that discovered a way to replace the energy-intensive calcine process used to make drywall. What the company came up with was a gypsum-free drywall they named EcoRock.
You may not think much about drywall, but it is the most common indoor building material in the United States. It does have a dirty secret, though. Typical drywall consist of gypsum, a calcined product which, like cement, needs to be cooked. Basically, it’s calcined (a thermal treatment process) and then dried. That energy-intensive process generates some 20 to 25 billion pounds of CO2 a year. The energy used to make a standard sheet of drywall is 100,000 BTUs or more per sheet, 4×8. When factoring in how much the drywall industry produces a year as a whole: upwards of 30 to 40 billion square feet in the U.S. alone, the CO2 emissions become staggering. In fact, the drywall manufacturing process produces 51 million tons of greenhouse gases and consumes almost 1 percent of all U.S. Energy annually.
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Published on June 8th, 2008
Author’s note: the following article on home heating is the sixth in an eight-part series.
Metal woodstoves are a significant improvement over open fireplaces from the standpoint of producing more usable heat. They limit incoming air, thus avoiding heating air not needed for combustion. Another improvement: they use a lengthened heat exchange pathway to improve heat transfer from the heated combustion gases before they exit the chimney.
Unfortunately, metal woodstoves must operate at low, inefficient, and polluting combustion temperatures. Why? Because wood combustion requires high temperatures to be clean and efficient. Wood burns starts to burn cleanly at around 1200 degrees Fahrenheit, with continuous improvement up to about 2000 degrees. Cast iron begins to glow red and fail at about 1200 degrees. See the problem?
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Published on June 8th, 2008
I don’t know how you spent your weekend, but we spent ours with hands outstretched, feeling for hot, attic air shooting out of electrical outlets, ventilation fans and air vents. After months of crazy-high electric bills, we decided to get to the bottom of why it was costing so darn much to cool our rather small home.
Enter the HERS Rater (Home Energy Rating System).
It turns out there are wonderful people who will come to your home, put up a strange looking contraption called a “blower door” on either your front door or entry to the attached garage. A fan is turned on, the pressure is measured (our house was brought to -50 Pascals) and the cubic feet per minute of air that is rushing out of the house is measured.
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Published on June 5th, 2008
As part of their year-long “Change the World, Start with ENERGY STAR” campaign, EPA has launched a website to help you save money and and energy with your programmable thermostat. A programmable thermostat properly programmed and used can reduce 1,847 lbs of green house gas emissions a year. According to the EPA, maximizing household energy use through serviced heating and cooling systems, leak-less ducts, and thermostats that are programmed to save energy at night or when residents are away, would prevent 169 billion lbs of greenhouse gas emissions per year. To those who are more swayed by the impact on their wallets, programmable thermostats can save about $180 a year. Find valuable tips and resources, including tutorials and a video podcast, on their new website www.energystar.gov/programmablethermostats.
Some of the helpful tips include lowering the temperature setting by 8 degrees when you’re away or asleep in the winter, or raising the temperature setting by 7 degrees when you’re away and 4 degrees when you’re asleep in the winter. Take advantage of the “Vacation” and “Hold” features to manage temperatures while you’re away from home for an extended period. More helpful tips from the EPA: Read the rest of this entry »
Published on June 4th, 2008
Editor’s note: Green building and resource conservation doesn’t have to involve the latest technology or high prices. Our friends at GreenBuildingTalk take a look at one of the humblest of water-saving devices — the faucet aerator — and show how this low-tech option is a good bet for homeowners looking to conserve water… and lower their bills. This post was originally published on Sunday, June 1, 2008.
About a decade ago, water conserving faucets and low-flow showerheads were the bane of contractors and homeowners alike. But over time, trial and error has led to better product design, education and installation. If your kitchen or bathroom faucet is fairly new, it will probably have an aerator in it. New faucets today typically have 2.2 gallons per minute (gpm) aerators, whereas conventional faucets typically use 4 gpm. If your faucets are more than ten years old, odds are they’re water hogs. Aerators provide a low-tech solution that not only make the flow more forceful, but provide more effective wetting and rinsing. Consider installing an aerator with a lower flow, such as 1.5, 1.0, or the lowest option available to date: .5 gpm.
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Published on June 2nd, 2008
Editor’s note: Just like our friends at Low Impact Living, we’ve got passion for saving water… so we were very happy to see this post about a new technology for homeowners interested in doing just that! LIL writer Jason Pelletier originally published this post on Wednesday, May 28, 2008.
I’m often pleasantly surprised at how much interest and passion you (our visitors) display for water-saving technologies. 
Renewable energy is sexy, and eco-friendly cars are top-of-mind for most people these days, but graywater systems? Rain barrels? Rain gardens? Even water-conserving toilets and showerheads? They’re pretty hot too … I for one am thrilled, for not only have I spent a good part of my career designing stormwater treatment systems but I believe that water shortages are a pretty pressing and difficult environmental challenge that doesn’t get enough attention in these days of $4 gasoline and global warming.
The beauty of any of these water-saving technologies is that a) they achieve multiple benefits, saving water while reducing wastewater or stormwater runoff and b) you can see the results right at home. It’s pretty satisfying to open the valve on a rain barrel, see the water flow out and know that you reduced pollution downstream and also prevented water from being siphoned from lakes or rivers tens or hundreds of miles away.
There are some challenges, though. In order to really make a dent in your runoff, you might have to use ten or more rain barrels - not so great if you don’t have space or your downspouts are on the visible side of your house (or if you’re not Ed Begley Jr and just don’t care!). Cisterns give you more capacity, but you’re talking about a real construction project with some possible permitting hurdles.
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Published on June 1st, 2008
Author’s note: the following article on home heating is the fifth in an eight-part series.
Open fireplaces have a reputation for polluting air. Actually, a fireplace, when burned hot and fast, creates very little pollution. The trouble is, a hot fire in a fireplace sometimes yields less heat than a smoldering fire. Where does the heat go?
The optimal amount of combustion air contains just enough oxygen to burn all combustible gases liberated by the heat. Any additional air grabs heat and sends it up the chimney. Under some circumstances, fireplaces can so far exceed this air-to-fuel ratio that they suck more heat out of a house than they radiate back into it. The fire actually makes the house colder!
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Published on June 1st, 2008
Let me first preface this post with the following: I’m not a construction professional. I’m just a curious homeowner seeking out the best building materials for my home. With that said, I was familiar with three options in residential construction - concrete block, wood frame or the super green alternative, rammed earth.
Turns out there are new options that combine the wonderful qualities of Portland cement with recycled post-consumer plastics (Rastra) or recycled wood fibers (Durisol).
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Published on May 29th, 2008
Remodeling a kitchen is an expensive process, and those who seek environmentally friendly products but are operating under a tight budget may feel they can’t afford to go green. Fortunately, the opposite is true. While there are many excellent choices for those for whom money is no object, some lesser known and much less expensive options offer the same environmental benefits. With a little knowledge and research, remodeling green can be easy and within your budget.
When seeking green kitchen cabinets, countertops, and flooring, the three areas to consider are materials, emissions, and whether it is a regional product. Each of these can have environmental advantages, and while finding products that qualify in multiple areas is certainly possible, some seek a kitchen with all recycled products or one with the minimum of harmful emissions. It is up to you to determine which area of green is most important to you. Read the rest of this entry »
Published on May 29th, 2008
Usually when we are talking about plumbing fixtures for green building we are dealing with something that conserves water. But some plumbing devices can contribute to energy savings, as well.
When you are in the shower, the hot water from the shower strikes your body and transfers some heat before it falls away. But most of the heat in that water simply goes down the drain. Reportedly, 80 to 90 percent of the energy used to heat water for the shower is lost down the drain.
A drain water heat recovery unit (DWHR) transfers heat from water running down the drain to cold water going to the water heater. This preheats the water so that the heater is starting with warmer water, and thus needs less energy. A DWHR unit can save as much as 25-30% of the energy used for water heating, and payback periods range from 3 to 7 years, depending on use patterns.
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