155
S. Tyler Ave. Pinedale, WY 82941-0489 | (307)
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What is Rammed Earth?
Rammed earth is a construction technique that compacts a damp mixture of sand, gravel and clay in a framed mold. Sometimes a stabilizer such as cement is added. A layer 4-10 inches high of earth is forcefully tamped into the formed space, reducing it to half its original height. The mold can be dissembled immediately and additional layers can be added until the desired height of the wall is reached. Once filled, the mold is disassembled and the mixture hardens.
Molds support the construction of the library's new rammed
earth walls.
Is it strong?
Yes, rammed earth, when completely cured (which can take up to two years), can be as strong as solid rock. It is also easy to work with once complete—nails can be driven into it and patches to damaged spots become undetectable.
What are the advantages of rammed earth?
Rammed earth has excellent thermal mass qualities, meaning it heats up slowly during the day and releases its stored heat once night falls—an attractive option for lower heating and air conditioning costs. It is impervious to cold winds, insects and rodents, is soundproof and nearly fireproof. Rammed earth is ideal for Green construction because it uses locally available materials, requires little energy to construct, and leaves no waste. It can accommodate a heavy load and with proper rebar reinforcement, will remain intact during earthquakes and violent storms.
Insulation is sandwiched between the inside and outside
wall.
But will it last?
Yes! Earth is the first building material ever used by man. Evidence of rammed earth techniques from thousands of years BC can be seen today throughout China, the Middle East and India. Half of the world’s population currently lives or works in buildings made of earth.
The
rammed earth contractor working on the library addition, Terra Firma of
Salt Spring Island, British Columbia, will be giving a program on rammed
earth in the new year. Please call the library if you would like
to be put on a list to be contacted when we firm up the date and time.
You may also view Terra Firma’s website at www.sirewall.com.