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WOFATI structures excel in effectiveness due to their emphasis on passive design principles, particularly Annualized Thermal Inertia, which utilizes the earth's thermal mass to regulate temperature fluctuations. By strategically incorporating design elements like large windows on the uphill side and a substantial gable roof on the downhill side, WOFATIs maximize passive solar gain, further reducing the need for artificial heating and cooling. This results in significant energy savings and reduced reliance on external energy sources. The use of locally sourced, natural materials, primarily wood and earth, in WOFATI construction minimizes the environmental impact associated with manufacturing and transportation of building materials. The "two-skin" system, a double layer of membrane encapsulating the earthen roof, ensures dryness and longevity, enhancing the building's overall effectiveness and sustainability. As seen in Allerton Abbey, the first WOFATI built at Wheaton Labs, these structures successfully demonstrate the practicality and efficiency of this building technique

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, a "freaky-cheap" and sustainable approach to human waste management, was developed by permaculture expert Paul Wheaton as an alternative to conventional septic systems and sewage treatment plants. The system emphasizes a closed-loop cycle, transforming human waste, or "poop", into valuable fertilizer, termed "willow candy". Unlike composting toilets, willow feeders utilize a dry environment created within sealed garbage cans to mummify the waste, preventing composting and the potential spread of pathogens. A small amount of sawdust is added to each can, primarily for aesthetic purposes. This dry process also preserves valuable carbon and nitrogen, which are often lost to the atmosphere during hot composting. After two years of aging, the pathogen-free "willow candy" can be safely applied as fertilizer to "poop beasts" — trees like willow, cottonwood, poplar, and bamboo — which can handle the high nutrient content without being harmed. This system turns human waste into a valuable resource, promoting sustainable gardening practices.