Key Considerations for Building Affordable Housing

 2. Building Technologies

• Utilize locally available, low-cost natural materials: Use straw, earth, stone, sustainable wood supplies, recycled materials, etc., instead of highly processed, energy-intensive manufactured materials that are shipped long distances.
• Keep the design small and simple so everyone can afford a home: The simplest homes are usually one-story structures that avoid complex rooflines, skylights, dormers, and complex shapes and angles.
• Energy-efficient design: Straw-bale construction, for example, provides super-insulation that greatly reduces long-term energy costs and almost eliminates the need for supplementary heating and cooling. In certain climates, earthbag building that utilizes soil at or near the building site may be the best choice.
• Permaculture principles: This can include roofwater catchment, composting, composting toilets, sheet mulching, organic gardening, xeriscaping, forest gardening and more.
• Appropriate technology: This can include solar ovens, mass heaters, solar water heaters and distillers. Consider all human needs such as cooking, water supply and waste disposal.  (This topic will be addressed in more detail below.)
• Passive solar design: Orient buildings along an east-west axis and use proper placement of windows (additional windows on the south, fewer on the west, north and east walls). Use correctly sized roof overhangs that allow penetration of the winter sun, but block the hot summer sun. Design for natural daylighting to minimize the need for artificial lighting.
• Utilize low tech solutions: This includes rubble trench foundations, earthbag or stone foundations, straw-bale construction, cob furniture, straw-clay, bamboo instead of rebar, pumice instead of rigid foam insulation, cellulose or rice hulls or cotton instead of fiberglass insulation, earthen floors instead of concrete, lime or earthen plaster instead of cement stucco, and minimally processed local wood instead of imported lumber.
• Incorporate the latest advancements in natural building methods and techniques such as roundwood or pallet trusses, external pinning with bamboo, etc.
• Use a ‘good hat and good shoes’: All buildings should have a good foundation and a good roof that protects the rest of the structure.
•  Create safe construction sites: Minimize use of power tools and limit their use to those who are qualified. Use sturdy ladders and include basic safety training for everyone who participates.