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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.
Dry outhouses offer a multitude of positive environmental impacts, aligning perfectly with the core principles of permaculture and sustainable living. Unlike conventional flush toilets that waste gallons of clean water and contribute to pollution, dry outhouses conserve water and prevent contamination. The "no pee" policy, combined with effective urine diversion systems, further minimizes the volume of waste and potential for groundwater pollution. The use of sawdust not only controls odors but also facilitates a dry composting process, essentially mummifying the waste over time and reducing it to poop-jerky after two years. This aged material is then safely used as a nutrient-rich fertilizer for "poop beast" trees like willows, poplars, and cottonwoods. This willow feeder system not only prevents harmful waste from entering the environment but also actively enriches the soil, promoting the growth of beneficial plants and trees. By avoiding chemical fertilizers and promoting natural decomposition, dry outhouses contribute to a healthier ecosystem, aligning with the HUSP (Horticulture of the United States of Pocahontas) concept that emphasizes sustainable land management practices. Furthermore, the absence of a water-intensive septic system eliminates the risk of leaks and contamination, safeguarding groundwater and promoting ecological balance. Therefore, dry outhouses offer a compelling example of how simple, well-designed systems can have a profound positive impact on the environment.
WOFATI, an acronym for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, is an innovative approach to sustainable building developed by permaculture expert Paul Wheaton. WOFATI structures are designed to be eco-friendly, utilizing locally sourced natural materials, primarily wood and earth. These structures are intended to be located on or near woodlands, promoting a harmonious integration with the natural surroundings. Annualized Thermal Inertia, a key element of WOFATI design, harnesses the thermal mass of the surrounding earth to provide passive heating in winter and cooling in summer, thereby minimizing the need for artificial temperature regulation. WOFATI structures are inspired by the work of Mike Oehler, a pioneer in earth-sheltered building known for his simple, "freaky-cheap" designs, which Wheaton has adapted and refined to further reduce construction costs. WOFATI buildings are typically characterized by a large gable roof on the downhill side, with at least 35% of the uphill wall featuring glass or other light-transmitting materials to maximize passive solar gain. Allerton Abbey, the first WOFATI structure, and Wofati 0.8 are both located at Wheaton Labs in Montana and serve as prominent examples of this unique building style.
The willow feeder system is a permaculture solution for managing human waste, developed by Paul Wheaton, that prioritizes safety, sustainability, and nutrient cycling. It is designed to be a "freaky-cheap" alternative to conventional septic systems and sewage treatment plants, utilizing readily available materials like garbage cans and sawdust. The system focuses on mummifying human waste in a dry environment within sealed garbage cans to prevent composting and the escape of pathogens. This dry environment also stops the loss of valuable carbon and nitrogen to the atmosphere, which is a common issue with hot composting. After two years of aging in the sealed cans, the resulting "willow candy" is pathogen-free and can be safely applied as fertilizer. While this nutrient-rich material could be used on any garden, it is best suited for "poop beasts" like willow, cottonwood, poplar, and bamboo, which can readily absorb the high nutrient content without harm. This system promotes a closed-loop approach, turning what is often considered waste into a valuable resource for growing beneficial plants.