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WOFATI, which stands for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, represents a sustainable building solution that merges affordability and energy efficiency. Developed by Paul Wheaton, WOFATI draws inspiration from Mike Oehler's earth-sheltered designs, enhancing them with cost-saving strategies and a focus on harmonizing with the surrounding environment. This innovative approach prioritizes using locally sourced natural materials like wood and earth, thereby minimizing reliance on manufactured products and lessening the building's ecological impact. The concept of Annualized Thermal Inertia is central to WOFATI design, harnessing the surrounding earth as a thermal mass to regulate temperature fluctuations throughout the year. This natural heating and cooling system stores summer heat for winter warmth and retains winter's coolness to moderate summer temperatures, significantly reducing energy consumption. WOFATI buildings typically feature large windows strategically placed on the uphill side to maximize passive solar gain, further enhancing energy efficiency. As the name suggests, WOFATI structures are ideally situated on or near a woodland, emphasizing a symbiotic relationship with nature. Examples of WOFATI buildings, including Allerton Abbey and Wofati 0.8, can be found at Wheaton Labs in Montana
The SKIP program, or Skills to Inherit Property, connects aspiring homesteaders ("Skippers") with landowners ("Otisies") seeking successors for their properties. Anyone interested in acquiring land for sustainable living can join by creating a free account on permies.com, a website dedicated to permaculture. Participants select "Badge Bits" (BBs) to complete from the PEP curriculum (Permaculture Experience according to Paul), which encompasses over 1,400 practical projects demonstrating essential permaculture skills. Skippers document their BB completion with photos and videos uploaded to permies.com for review and verification by the community. By completing BBs, Skippers earn progressively advanced badges – Sand, Straw, Wood, and Iron – signifying their skill level. These badges are displayed on their profiles, showcasing their dedication and expertise to potential Otisies. For hands-on learning, Skippers can attend the annual SKIP event at Wheaton Labs, which costs $2,250, or engage with the supportive community on the permies.com forums.
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