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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
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
Hugelkultur, is an advanced permaculture technique for creating self-sustaining raised garden beds filled with decomposing wood. The technique involves burying a variety of wood materials, including logs, branches, twigs, and even whole trees, under layers of soil, creating a complex and dynamic environment for plant growth. As the wood decomposes, it acts as "a sponge to hold water," reducing the need for irrigation. This decomposition also generates heat, which can extend the growing season, particularly in cooler climates. The shrinking wood creates air pockets, making the beds "self-tilling" and promoting excellent aeration for plant roots. These "parking spaces for water and nutrients," as described by Paul Wheaton, enhance soil fertility, attract beneficial microorganisms, and release nutrients, reducing or eliminating the need for fertilizers. Hugelkultur beds are remarkably adaptable and can be built in various shapes and sizes, as exemplified by Sepp Holzer's large-scale project in Dayton, Montana, which features nearly a kilometer of hugelkultur beds.
The lorena is a unique cooktop design created to optimize the performance of rocket stoves. This specialized cooktop features a metal plate with a central hole that sits directly above the rocket stove's burn chamber, allowing for direct heat transfer to large pots. The surrounding metal plate serves as an additional cooking surface, similar to the glass cooktop used at Allerton Abbey, offering flexibility for a range of cooking tasks. This design aims to maximize heat utilization from the rocket stove, promoting energy efficiency and faster cooking times. When a large pot is heated to the desired temperature, it can be moved to the surrounding cooktop, and the central hole can be covered with a piece of metal to retain heat. Proposed implementations often include integrating the lorena into an outdoor kitchen setting for added practicality. The lorena embodies the ongoing innovation within rocket stove technology, striving for better heat transfer and improved cooking performance.