Other times have not changed. I mean we are still burning coal to fuel electric generators, 30 years after we should have. We still flirt with the idea of Nuclear Powered power plants. But here is part of the Georgia Code, a State not known for anything progressive.

http://www.southface.org/learning-center/library/res-code-faq#24

22.    What is the difference between a mass wall and a basement wall, and what are the insulation requirements for both?

A mass wall is a heavy wall that is more than half above grade wall and is constructed of a fairly massive material (e.g., concrete, block, insulated concrete forms, masonry cavity, non-veneered brick , adobe, compressed block, rammed earth, and solid logs). A basement wall is a wall that is more than half below grade and encloses conditioned space. Insulation requirements for basement walls and mass walls depend on the location of the insulation and the type of insulation (whether it is continuous or insulation installed in a cavity). Requirements also vary by climate zone. Below is a table detailing the insulation requirements in the energy code.

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If you are a glutton for punishment, go there and read. More next week.

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Yes I know there are many things that are wrong about Las Vegas. People shouldn’t even be there in the first place. The rape of the river that no longer reaches the sea. The rape of the pristine desert and the death of many Native Americans. I lived there for a year and there is also the cheesy nature of the culture. But when they do something right, you got to give them credit.

http://www.homeenergy.org/show/article/id/1811/viewFull/

Nevada Energy Star Partners Demonstrate Peak Performance (Web Only)

Las Vegas may appear balmy and inviting with its sparkling pools and swaying palm trees, but those who live in Neon City know the truth: It’s too cold in the winter and too hot in the summer.

Unfortunately, hundreds of thousands of homes that were built during an amazing 50 years of rapid growth in the Southwest do not incorporate modern advances in energy performance to accommodate the wild swings of desert climate. As temperatures climb to 110°F in the summer, many homes leak large amounts of cooled air through gaps in ducts, roofs, windows, and doors. And when the frigid north wind drops the temperature below freezing in the winter, heated air escapes, leaving living rooms and bedrooms uncomfortably cold and drafty. While Las Vegans know their climate, they may not realize that they are paying to heat and cool the great outdoors.

The dramatic temperature shifts in the high-desert climate make Las Vegas an ideal place for homeowners who are looking to make their homes more comfortable and to save substantially on their energy bills. Funded in part by DOE’s Building America program, the Building America Retrofit Alliance is working with the Nevada ENERGY STAR Partners–Green Alliance (NESP–Green Alliance), and with Better Building Performance, a Las Vegas company, to upgrade two typical homes top to bottom. Their goal has been to show homeowners and remodelers how easy and effective energy performance upgrades can be.

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Go there and read. More Tomorrow.

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When I first saw the headline of this next site, I thought: can this be? I had heard of actual corn cob houses in rural America. They are basically slatted walls filled in with corn cobs and then finished inside and out. They are sort of a variation of hay bale houses. But this is way different.

http://www.livingoffgrid.org/building-a-cob-house/

Building a Cob House

By Off Grid Ebert

In a time in which we are increasingly hearing scary statistics about the fate of our planet, the way forward in the field of sustainable, green building may just be to go backward.  This is certainly the case for people demonstrating a growing interest in building earthen homes and structures using an ancient method known as cobwork or cobbing.  Cobbing, believed to have originated in the Maghreb as early as the 11th century, spread into wide usage across many parts of the rest of Europe as the main building style for homes.  The name of this style of building comes from the word cob, which is the name of the building material itself, formed of a mixture of earth (such as clay, sand, and other soil), straw, and water.  Despite what the materials may imply, this substance, when dried, is fireproof.  It is also inexpensive, and naturally cool in the summer heat and relatively easy to heat in the winter.

Many homes built of this material centuries ago still stand and remain in use.  Pictured here to the left is a cob house in England, believed to have been built in the late 1700s. (Photo by Tim Green, http://www.flickr.com/photos/atoach/4927564858/) These homes typically have thatched roofs, while small but efficient fireplaces with chimneys provide warmth when the weather is cold.

The appearance and texture of cob varies from region to region, depending on the available natural resources and their characteristics.  As such, cob is one of the most versatile building materials on earth.  It can be molded and shaped into whatever form is framed by the builder.

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Go there and read. More tomorrow.

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All these new builds include some form of solar planning. Either in orientation, or window protection, or solar electric generation, the sun is never far from these planners minds.

http://www.hgtvpro.com/hpro/green_building/article/0,3142,HPRO_27916_6024083,00.html

Five Models of Energy Efficiency: A Guide to Beautiful, Energy-Efficient Homes

Five US builders are being honored for their exceptional achievements in high performance building at the second annual BASF Builders Challenge Awards.

Led by the U.S Department of Energy (DOE), the Builders Challenge is working with homebuilders across America to build a new generation of high-performance homes, working toward the ultimate goal of providing cost-effective, net-zero energy homes by 2030 for all Americans.

To qualify for the Builders Challenge, homes must meet at least a 70 on the EnergySmart Home Scale (E-Scale) — which means they must use at least 30 percent less energy than a typical new home built to code.

2010 BUILDERS CHALLENGE AWARDEES

Colorado Builder’s Net-Zero-Energy House Costs Just 7% to 8% More Ecofutures Building Inc. developed four certified Builders Challenge homes (two with minus-three HERS ratings). These net-zero-energy measures represented only 7% to 8% of the total building cost. See how they did it so cost-effectively >>

Treating the Home as a Whole System By treating houses as a complete system, David Weekley Homes qualified 280 homes for the Builders Challenge with HERS scores averaging 67. The homes ranged from 1,500 to 5,500 square feet. Get better results by treating the house as a whole system >>

College Students’ Habitat for Humanity Home Yavapai College students built a Habitat for Humanity house that achieved the remarkably low HERS score of minus-three. Their 1,207-square-foot home cost only $92 per sq. ft. cost to build. Learn how the students got it done >>

Homebuilder Adds Net Zero Energy Upgrade Package Artistic Homes of Albuquerque offers a net-zero-energy upgrade option on all their homes. They’ve completed and sold 11 true net-zero-energy homes ranging from 1,305 to 2,905 square feet and costing between $160,000 and $300,000. Find out about the upgrade option >>

Builder Promises Zero Energy Bill for Five Years Tim O’Brien, a fanatic about eliminating air infiltration, actually got $400 back from the utility the first month after construction was finished. He guarantees a zero energy cost for the first 5 years on his home. See what makes this builder so confident >>

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More next week.

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It’s Jam Band Friday – http://www.youtube.com/watch?v=xvYsBlg4QEM

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http://www.professorshouse.com/your-home/environmentally-friendly/energy-efficient-shingles.aspx

Energy Efficient Roof Shingles

Home > Your Home > Environmentally Friendly > Articles > Energy Efficient Roof Shingles

The right roof is essential to designing an environmentally friendly and energy-efficient home. If you’ve got typical shingles or hot asphalt on your roof—as many homeowners do—you could be doing better. Below are a few cutting-edge roofing techniques that can cut your energy costs and make your house greener at the same time.

Use recycled shingles. If you want an environmentally friendly roof, the worst thing you can do is install 15-year, non-recycled shingles. These are among the most disposable building materials, are hardly ever recycled, and contain toxic volatile organic chemicals that evaporate under the heat of the sun. This means that just by sitting under the sun and heating up, your home is releasing toxic chemicals into the air. For a greener option, use recycled asphalt shingles that use reclaimed materials, reducing waste. These shingles often have a 50-year lifespan instead of 15, so you won’t have to replace them as often.

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http://www.youtube.com/watch?v=kilR-4rQS5g

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Consider metal. Metal roofs are more energy-efficient than shingles. Metal roofing is typically made from aluminum, copper, or steel, and you should ensure that your roofing is lead-free. Metal does not have the kind of heat-absorption qualities shingles have, so it will absorb and radiate less heat into your home. In fact, the right color metal will actively reflect sunlight, keeping your home cooler in hot summer months when the sun is most intense. Metal roofing also stands up to the elements better than shingles typically do—it’s the best for rainwater catchment systems, and snow slides off it easily.

Reflective coatings. To make your shingled roof more energy-efficient, brush a reflective coating on. Uncoated shingled roofs typically absorb around 80% of the sunlight that hits them—heating your home in the summer and driving up your air conditioning bill. A coated roof, however, can reflect about 80% of heat—giving you significant energy savings.

Clay and slate. Two natural materials that make excellent green roofing choices, clay and slate are both energy-efficient, can be disposed of without pollution, and are much less toxic than shingles. Corrugated clay tiles encourage air flow on the surface of the roof, keeping the home cool in the summer. However, hail will shatter it, which is why it’s typically only used in warmer climates. Slate is far more durable—it can last up to 100 years with minimal maintenance. Slate can also be reclaimed and recycled.

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http://www.youtube.com/watch?v=9B7YeDmmTFc

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Building-integrated photovoltaics (BIPV). This is a roofing system that’s coated with a film that converts sunlight into electricity—a solar-power coating for your roof. This system uses tiles or shingles, and the electric current flows on the edge of the roof. The tiles look like slate, and can be installed by most roofers—an electrician will also be needed to hook the solar-energy system up to your home’s electrical system. The charge it generates isn’t huge—about 1 kilowatt of energy per 100 square feet of tile

Roof turbines. Companies in the Netherlands, Scotland, and Britain are developing small turbines designed to install on roofs and convert wind power into home electricity. The turbines are typically around six feet across, and are usually mounted on the roof or a pole. Roof turbines feed energy into a converter, which transforms it into electricity for home use. They can typically provide enough power to operate lights, a refrigerator, a television, and a computer—providing significant energy savings. However, the amount of energy an individual house sees will depend on how windy its location is

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More next week.

http://www.youtube.com/watch?v=1EAog6Crv7c

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http://earthbagbuilding.wordpress.com/2010/07/12/alternative-waterproof-membranes-for-living-roofs/

There’s growing interest in living roofs or green roofs. The difficulty is deciding on the waterproof membrane. Rubber pond liner (EPDM) is the most waterproof and durable material, and the most common choice due to proven performance, but it’s also very expensive and made from nasty petro chemicals.

Living roof at Heartwood Homesteads

I think a number of less toxic, more affordable materials are possible, including recycled materials in good condition. One reader suggested pool covers. Heavy duty trucker tarps are another option. You could add 6 mil poly (plastic sheeting) underneath and/or above these other materials for extra moisture protection.

For my dome, I used 2-1/2 layers of 6 mil black poly and have had no leaks so far after about three years in a rainy climate. (The half layer is a small piece on the very top.) You need to cover 6 mil poly carefully to avoid punctures. Some use old carpet or cardboard against it while adding soil. (Screen out rocks.) In our case, we simply packed soil on the plastic, starting at the bottom and working up, with no protective cardboard, etc.

Recycled vinyl billboards are another possibility, but I wouldn’t use them because of the health hazards of leaching chemicals into the soil around the house.

Roof pitch is another consideration. Steep roofs shed water faster and are less prone to leaks. But you need to strike the right balance or top soil and nutrients will wash away, and your roof will dry out too quickly.

Another consideration is the value of the structure. It’s no big deal experimenting with alternative waterproof membranes on a simple $2,000 guesthouse. But you might want to use better materials or multiple layers on expensive homes.

Photo credit: Heartwood Homesteads

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More Tomorrow.

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We return to alternative roofs again this week. Rubber roofs last a long time BUT when they fail…they fail all at once..

http://www.flatroofsolutions.com/

*We are looking for wholesale distributors and stocking stores for our new Multi-Surface Patch Kits* click here

EPDM Rubber Roofing – The Flat Roof Solution

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More tomorrow.

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