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WOFATI structures are characterized by a thoughtful design that prioritizes passive systems and natural, locally sourced materials. The "two-skin" system, composed of a double layer of polyethylene membrane, encapsulates the earthen roof, providing a durable and waterproof barrier. The lower layer hugs the structure, while the upper layer defines the thermal mass surrounding it, with at least eight inches of dirt between the layers and sixteen inches on top. WOFATI designs emphasize a harmonious integration with the surrounding woodland, incorporating the "soil on wood" building technique. This method eliminates the need for a conventional concrete foundation, making construction faster and more affordable. A distinctive feature of WOFATI houses is the large gable roof on the downhill side, often incorporating glazing to allow light penetration, while at least 35% of the uphill wall features windows for optimal passive solar gain. This strategic placement and sizing of windows is crucial for maximizing natural light and regulating internal temperature, contributing to the effectiveness of Annualized Thermal Inertia.
Beyond the foundational elements of WOFATI design, there are advanced concepts that further enhance its effectiveness and versatility. The strategic placement and sizing of windows on the uphill side, for instance, are crucial for optimizing passive solar gain and regulating temperature. The design of the "two-skin" system, incorporating a double layer of membrane, demands careful consideration of materials and installation techniques to ensure long-term dryness and durability. The integration of WOFATI principles with other sustainable technologies, such as rocket mass heaters, offers the potential for a highly efficient and self-sufficient dwelling. The concept of WOFATI extends beyond just houses; variations such as WOFATI coolers and freezers, utilizing specialized venting systems and expanded thermal mass, showcase the adaptability of this approach to address various needs. Furthermore, WOFATI principles can be applied to animal shelters, with specific modifications to accommodate larger spaces and functionality. The ongoing development and experimentation at Wheaton Labs, as seen in projects like Allerton Abbey and Wofati 0.8, continue to push the boundaries of WOFATI design and its potential for sustainable living.
Cast iron cookware can last hundreds of years while some other cookware needs to be replaced every 6 months. Cast iron is the true non-stick pan. When the surface is coated with a dab of oil or fat of your choice, eggs will slide freely.
Dry outhouses, frequently discussed in permaculture, provide a sustainable sanitation solution that prioritizes resource conservation and waste reduction, but their usability and effectiveness rely on careful design and management. While simple in concept, dry outhouses require specific considerations to optimize user experience and ensure proper waste handling. Strategic placement on elevated ground promotes natural drainage and helps maintain a dry pit, essential for reducing odors and pathogen survival. However, achieving a truly "no pee" environment, while ideal for minimizing volume and toxicity, can be challenging, especially for women. Urine diversion mechanisms are crucial for separating urine, a valuable fertilizer, and facilitating a drier composting process for the solid waste. The addition of sawdust further aids in odor control and composting, while proper ventilation, often achieved through a "breather pipe" in a willow feeder system, ensures aerobic decomposition and minimizes smells. User comfort can be enhanced with features like comfortable seating, adequate lighting, and clear instructions on proper usage, including sawdust application and urine diversion practices. Effectiveness in terms of long-term sustainability hinges on proper waste management. The "mummified" waste, or poop-jerky, after two years of aging, is ideally applied to "poop beast" trees like willows, poplars, or cottonwoods, completing the nutrient cycle. By addressing usability and effectiveness through thoughtful design and management, dry outhouses can become a viable and environmentally sound sanitation solution, embodying the principles of permaculture.