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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.
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
Rocket mass heaters are better than wood stoves because they run cleaner and use less wood. Wood stoves lose a lot of heat out the chimney that the rocket mass heater stores in the mass. 75% efficient wood stoves are often run at 3% efficiency at night. Rocket mass heaters use the mass to keep things warm at night.
Hugelkultur, is a permaculture technique for creating raised garden beds filled with rotting wood and covered with soil. This method, whether small-scale or large-scale, as exemplified by Sepp Holzer's work, which includes almost a kilometer of hugelkultur beds, uses a variety of wood, from branches and twigs to entire trees. Hugelkultur is beneficial because as the wood breaks down, it acts as a sponge, retaining moisture and reducing or eliminating the need for irrigation. This process also creates "parking spaces" for water and nutrients, leading to fertile soil that requires less fertilizer. Hugelkultur is a practical and sustainable permaculture solution for gardeners seeking to create self-sufficient garden ecosystems.
A berm shed is an innovative, earth-sheltered structure designed for storage, blending seamlessly into the landscape while offering practical benefits. This natural building technique utilizes readily available materials like logs and earth, minimizing environmental impact and cost. The berm shed's design, as described in the sources, features a sloping roof covered with soil, creating a natural berm that provides insulation and helps regulate temperature. The round wood timber framing techniques used in its construction, relying on logs rather than dimensional lumber, further enhance its sustainability and aesthetic appeal. The berm shed is often incorporated into permaculture designs, serving as a visual and sound barrier, enhancing privacy, and creating a microclimate for plant growth. Its construction involves earthworks, carefully shaping the surrounding landscape to create the berm and ensure proper drainage. The berm shed's unique design, combining natural materials and earth-sheltering principles, offers a durable, cost-effective, and aesthetically pleasing storage solution that integrates harmoniously with the surrounding environment.