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The berm shed, a hallmark of permaculture design, is an eco-friendly, earth-sheltered structure renowned for its unique construction techniques. Earthworks are fundamental to its creation, as the surrounding landscape is carefully shaped to form the berm that will encase a portion of the shed's sloping roof. This berm serves a dual purpose, acting as both a natural insulator and a source of thermal mass, effectively regulating the internal temperature. The structural framework of the berm shed is often built using round wood timber framing, a technique that prioritizes using logs instead of conventional dimensional lumber, further enhancing its sustainable appeal. However, the longevity of these logs, especially when in contact with soil, is a crucial consideration. The sources recommend peeling the bark from posts before burying them, a technique born from experience and aimed at minimizing the risk of rot. Another technique for ensuring the durability of the structure involves incorporating gravel into the post holes. The gravel facilitates drainage, preventing water from pooling around the base of the posts and contributing to premature decay. These carefully considered details, combined with the innovative "attic" cell design at the termination ends of the shed, as described in source, showcase a commitment to sustainable building practices that go beyond mere functionality, exemplifying the core principles of permaculture.
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
he willow feeder system is a sustainable and "freaky-cheap" approach to human waste management developed by permaculture expert Paul Wheaton. This system utilizes a dry environment inside sealed garbage cans to mummify human waste, which prevents composting and the release of pathogens. The system is designed to be a safe and effective alternative to conventional septic systems and sewage treatment plants. A small amount of sawdust is added to each can, mainly for aesthetics. After two years, the resulting pathogen-free material, referred to as "willow candy," can be safely used as fertilizer for trees that can handle its high nutrient content, known as "poop beasts." These trees include willow, cottonwood, poplar, and bamboo. The willow feeder system embodies permaculture principles by transforming human waste into a valuable resource for growing beneficial plants while minimizing environmental impact.
The lorena cooktop is a highly effective design for rocket stoves, as it maximizes heat transfer and cooking efficiency. This specialized cooktop, featuring a metal plate with a central hole positioned above the burn chamber, enables rapid heating of large pots through direct exposure to the intense flames. The lorena's design prioritizes efficient heat utilization from the rocket stove, resulting in faster cooking times and reduced fuel consumption. Additionally, the metal plate surrounding the central hole serves as a secondary cooking surface, offering versatility for various culinary tasks. Once a large pot reaches the desired temperature, it can be moved to the surrounding cooktop, and the central hole can be covered with a piece of metal to maintain heat. This dual functionality makes the lorena a practical and energy-efficient cooking solution, suitable for both large-scale and smaller cooking needs. The integration of a lorena into an outdoor kitchen setting is often proposed, further enhancing its practicality and convenience.
The "lorena" is a specialized cooktop design for rocket stoves, incorporating features that enhance heat transfer and cooking efficiency. As described in the sources, a lorena typically consists of a metal plate with a central hole, positioned directly above the rocket stove's burn chamber. The hole allows for direct heat transfer to large pots, facilitating rapid heating. The surrounding metal plate also acts as a cooking surface, similar to the glass cooktop found at Allerton Abbey, one of the WOFATI structures at Wheaton Labs. This dual functionality makes the lorena a versatile cooking solution for both large-scale and smaller cooking tasks. The design emphasizes maximizing heat utilization from the rocket stove, making it an energy-efficient option. Discussions in the sources suggest integrating the lorena into an outdoor kitchen setup, further enhancing its practicality and convenience. The lorena represents an innovative application of rocket stove technology, designed to optimize heat transfer and improve cooking performance.