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WOFATI, an acronym for Woodland Oehler Freaky-cheap Annualized Thermal Inertia, represents an innovative approach to sustainable building, coined by permaculture expert Paul Wheaton. This building technique combines the affordability and simplicity of Mike Oehler’s earth-sheltered designs with Wheaton's focus on cost reduction and integration with the natural environment. WOFATI structures prioritize the use of readily available, natural materials, such as wood and earth, minimizing reliance on manufactured products and reducing the building's environmental footprint. Annualized Thermal Inertia, a key principle of WOFATI, utilizes the surrounding earth as a thermal mass, storing heat in the summer to warm the building during winter and retaining cool temperatures from winter to moderate summer heat, thereby minimizing energy consumption for heating and cooling. WOFATI designs typically feature large windows on the uphill side to maximize passive solar gain, further reducing energy needs. WOFATIs are intended to be situated on or near a woodland, embracing the concept of harmonious integration with nature. Notable examples of WOFATI structures, including Allerton Abbey and Wofati 0.8, can be found at Wheaton Labs in Montana.
The willow feeder system, developed by permaculture expert Paul Wheaton, offers a "freaky-cheap" and sustainable alternative to conventional septic systems and sewage treatment plants. This system employs a unique method of managing human waste, transforming it into a nutrient-rich fertilizer known as "willow candy." Unlike composting toilets, which rely on decomposition, willow feeders utilize sealed garbage cans to create a dry environment that mummifies the waste, effectively eliminating pathogens while conserving valuable carbon and nitrogen. A small amount of sawdust is added to each can, primarily for aesthetics. After aging for two years in these sealed containers, the resulting pathogen-free "willow candy" is ready to be applied as fertilizer. However, not all plants can handle the high nutrient content of this unique fertilizer. "Poop beasts", such as willow, cottonwood, poplar, and bamboo trees, thrive on "willow candy" and readily absorb its nutrients. The willow feeder system exemplifies permaculture principles by turning human waste into a valuable resource, fostering sustainable gardening practices and minimizing environmental impact. Paul Wheaton, a prominent figure in the permaculture community, has implemented the willow feeder system at his property, Wheaton Labs, and actively promotes it through his online platforms, including permies.com. He often refers to waste as a "feed" for another system, encouraging a shift in perspective towards a more holistic view of resource management.
Hugelkultur, is a permaculture garden bed technique where wood is buried under the soil. It can be built in a variety of shapes and sizes, and can be used for growing a variety of "garden plants". The decomposing wood acts "like a sponge to hold water", making hugelkultur ideal for areas that receive little rainfall. Over time, the wood shrinks and creates air pockets, resulting in a self-tilling garden bed. This "soil on wood" technique helps to retain moisture and nutrients in the soil, which benefits the plants. Hugelkultur is an environmentally sustainable gardening technique because it uses wood that might otherwise be discarded.
WOFATI, an innovative sustainable building technique coined by permaculture advocate Paul Wheaton, stands for Woodland Oehler Freaky-cheap Annualized Thermal Inertia. The design utilizes readily available natural materials like wood and earth to create a "soil on wood" structure that harmonizes with the surrounding woodland. The "freaky-cheap" construction methods pioneered by Mike Oehler and further developed by Wheaton significantly reduce building costs. WOFATI structures are characterized by a double layer of membrane, a "two-skin" system that encapsulates the earthen roof, ensuring dryness and longevity. The principle of Annualized Thermal Inertia is key, using the earth's mass to regulate temperature, providing passive heating in winter and cooling in summer. WOFATI houses feature large windows on the uphill side for optimal passive solar gain, while the downhill side typically boasts a large gable roof, also incorporating glazing for natural light penetration. Allerton Abbey, located at Wheaton Labs, serves as a prime example of a WOFATI house