Rammed Earth Building
'Muddies' fall foul of green ruling
The handmade mudbrick -- natural subsoil mixed with straw and water, and dried by the sun -- symbolises Earth's sustainability, green values and a low carbon footprint. From hippies putting up bush huts, to the well-off building impressive mansions, most agree on the insulation quality and energy efficiency of mudbrick.
"It's a beautiful way to live and nowadays everyone has to be thinking about the environment," says Julie McKellar, who will move into her new mudbrick home in December.
But her architect, Marshall, whose creations had previously achieved compliance with Australian building codes, and many others in the earth building industry, are now at their wits' end. Some are on the verge of admitting defeat to federal and state bureaucracies, which do not recognise the environmental value of the mudbrick.
Over the past eight years the rollout of increasingly stringent and mandatory energy-efficiency ratings for new homes has made it significantly harder for "muddies", some of Australia's most passionate environmentalists, to get building approval.
But since the adoption two months ago of the even tougher six-star rating, designed to limit carbon emissions by reducing the amount of heating and cooling required by homes, the earth building industry says it may be doomed. Marshall said the McKellar home could not be built under the new six-star regime. New rammed-earth houses are similarly affected.
Builder Stephen Dobson, of the Earth Building Association, told The Australian that the previous ratings made compliance difficult but that the new six-star rating was "decimating the industry".
"The star ratings have been a disaster for earth building and it is getting worse," he said. "Earth builders say now that the regulations make it too hard. The energy ratings are biased and based on models that do not assume real life -- they don't reflect the actual behaviour of people in these homes. As a result, the earth building industry is in serious decline."
The difficulty is ironic. According to independent studies, "muddies", and those who build with rammed earth, are often people with "eco-centric attitudes, values and behaviours". They use less power and have correspondingly lower carbon footprints.
While mudbricks have been a sustainable building material for thousands of years, they cannot readily satisfy energy-efficiency standards. Part of the problem is that the solid mudbrick wall, which is 25cm thick, does not rely on additional insulation, so it scores poorly when measured by official energy rating tools.
Rammed Earth Building - News
As a result, the earth building industry is in serious decline." The difficulty is ironic. According to independent studies, "muddies", and those who build with rammed earth, are often people with "eco-centric attitudes, values and behaviours".
Though there's nothing less mobile than thick, rammed-earth, reclaimed tire walls partially sunk into the desert floor, earthships are transportive in a way, and the mission is often total sustainability and self-reliance.
Then there's the Wales Institute of Sustainable Education by Pat Borer and David Lea, a work of ingenuity and rammed earth in an old slate quarry. Its inclusion would have been an opportunity to recognise architects outside the London orbit of fashion
About 70% of the wall is made of rammed earth and adobe; the other 30% is made of brick. The design of the Temple of Kukulkan, built in the year 1000, is one of four cardinal points with 91 steps each, which makes up a total of 364 (for 365 days in the
“For almost three years, the architects' team and I have organized training sessions for the Bedouins in various fields such as carpentry, rammed earth - a technique for building walls using the raw materials of earth, chalk, lime and gravel that exist
Rammed earth can be used for buildings | www.gtworkshops.com
Introduction
Rammed earth building technology has been around as long as the Great Wall of China, in fact part of it was constructed using these actual building methods.
The mixture used for building construction comprises of portions of sifted soil, sand, gravel and lime with water added to produce a soft pourable mix.
To construct the building walls, the mix is poured into a formed framework and rammed tight using a hand tamper or a mechanical driven one, until the mix is compressed to about half its original depth. The operation is then repeated until the walls are of the desired height and length.
This is my third article in a series about natural green building materials, and as before, it is not written as a specific construction guide, but as a description of the different methods and materials used in green building construction.
We shall start by having a look at how the material is mixed, which is the first stage in rammed earth building technology.
The construction material is prepared by mixing quantities of the following items,
Clay – any excavated or surplus soil from the building plot can be used after sifting. Don’t use the topsoil. keep this for your lawn and veggie garden. Soil makes 65% of the mixture. Lime or ox blood – this acts as a stabilizer bonding the items together. These stabilizers are much more environmentally friendly than the conventional cement bond used by some builders. The stabilizer makes up 4% of the mix. Gravel – fine gravel is added to give further stabilization and bulk to the mix. This is just a couple of handfuls, about 1% of the mix Sand – this is the major ingredient of the mix and is added to improve the walls’ insulation properties as well as adding bulk and improving the quality of the finish. The sand makes up the remaining 30% of the mixture.This is just a guide, check with the local Rammed Earth Builder for the optimum mix for your area, some of whom recommend the addition of cement to create stabilised rammed earth (SRE)
Framework
This is constructed to the desired width and shape of the building walls. Its purpose is much like that of concrete shuttering, being a frame into which the mixture of earth and sand is poured, and maintaining the shape of the frame when set.
The frame we shall use is constructed from plywood reinforced against bowing with horizontal stiffeners of strips of wood.
Loving watching Grand Designs. I dream of building a mudbrick/rammed earth/strawbale home with my own hands.
@ To infect people with green building? Sid's not coming in. He's got a nasty attack of rammed earth!Rammed Earth Building - Bookshelf
Adobe and Rammed Earth Buildings, Design and Construction
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