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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 distinction between "woodland" and "forest" is subtle but significant within the context of permaculture, particularly in Paul Wheaton's approach to Wofati design. While "forest" implies a focus on traditional forestry practices, often associated with monoculture and resource extraction, "woodland" evokes a more holistic and interconnected ecosystem. Woodland management, as exemplified in Ben Law's books The Woodland Way and The Woodland Year, emphasizes sustainable practices that prioritize biodiversity, ecological balance, and human integration with the natural world. A woodland is seen as a space where humans are active participants, nurturing and benefiting from the ecosystem's abundance, similar to the Native American land management practices that inspire the HUSP (Horticulture of the United States of Pocahontas) concept. In contrast, a forest, within this framework, is often viewed as a resource to be exploited, a perspective that aligns with the concerns raised about conifer monocultures and their detrimental impact on biodiversity and soil health. Therefore, "woodland," as used in the context of Wofati, signifies a conscious shift towards a more harmonious and sustainable relationship between humans and the natural world. This distinction underscores the importance of terminology in shaping our understanding and approach to land management within the permaculture movement.
The construction of a berm shed, a sustainable and aesthetically pleasing storage solution, involves a unique process that utilizes natural building techniques and earth-sheltering principles. First, the building site is prepared using earthworks, shaping the surrounding land to create a berm, which is a raised bank of soil that will eventually cover a portion of the shed's sloping roof. Round wood timber framing is a common technique employed in berm shed construction, utilizing logs sourced from the property instead of commercially produced dimensional lumber. These logs are carefully selected and placed to form the structural framework of the shed, including the walls and roof supports. Once the timber frame is erected, a moisture barrier, such as billboard material or layers of poly sheeting and newspaper, is installed over the logs to protect them from the elements. Finally, soil is carefully layered on top of the moisture barrier, creating the berm and providing insulation, thermal mass, and a natural aesthetic. The construction process prioritizes using natural, locally sourced materials and minimizing the use of energy-intensive and potentially toxic commercial products, aligning with permaculture principles of sustainability and self-sufficiency.