mA received project management training in the construction of Strawbale Housing and the processes involved in the design and building of eco-houses that re-use natural elements to provide sustainable living in a harsh climate. The project was carried out in Ciudad Juarez, Mexico for Worldhandsproject, a wonderful organisation run by inspirational architect and eco-inventor Alfred von Bachmyer. Straw is a huge waste product in the US and so purchasing the 18" x 12" bales was a cheap way of obtaining material to make walls from. Palettes picked up from around the neighbourhood, bought for a less dollar each, were quickly dissassembled to be fitted into a truss system to carry a sheet metal roof. The roof was one of only a few of high embodied energy materials (others were rock-board for internal ceiling, concrete for foundation and rebar for stability) used to harvest any rainwater which fell throughout the year for reuse with domestic functions such as washing or bathing. Juarez has a harsh climate with less than 6 inches of rainfall a year so water is a precious commodity.
The strawbale walls are held firm using metal rebar which is tied inside and out and fixed to a bond-beam at the top of the walls; these ties are then looped through a shallow but necessary concrete foundation underneath the walls. Pallette trusses are then fixed to the bond beam and stabilised across themselves with spare wood. The sheet metal is then fixed to the trusses.
The material applied to the walls is called Cob. It is a hand mixed concoction of straw, sand, clay and water and is mixed often by stomping around in a tribal fashion! This Cob, starting with a viscous mixture, is applied by hand to the strawbale walls and continues until the whole wall is flush straight with an even plaster-like finish. In particular, the detailing around the windows is soft and aesthetically very pleasing. A natural wheat-based lime finish is then painted onto the Cob walls to give a stunning white-washed finish to the building.
mA were in discussions with Worldhandsproject regarding systems that in the future could be implemented to provide even more recycling of waste and water to fertilise fruit-tree gardens and composting crop beds. The self-contained allotment of the future perhaps necessary in an age where the Earth's natural resources are being exploited so carelessly?