
DIY Trombe Wall Made From River Rock and Wire
This article explores an innovative and sustainable approach to building passive solar Trombe walls, specifically highlighting the work of DesignBuildBLUFF. This organization's core mission is to construct safe, sustainable, off-grid homes for families residing on the Navajo Nation Indian Reservation, situated in the four corners region near Bluff, Utah. The focus is on a particular project: the Dora and Baxter Benally home, which incorporates hand-made earthen brick, cork, and a passive solar Trombe wall constructed from river rock. These homes are designed and built by first-year graduate students from the College of Architecture + Planning at the University of Utah.
DesignBuildBLUFF emphasizes the use of locally sourced and reclaimed materials, reflecting a deep commitment to environmental sustainability and resourcefulness. Their building methods heavily rely on readily available natural resources found in the sandy desert environment. For instance, rammed earth, earthen plaster, and adobe-like bricks are created directly from the local dirt. Materials are salvaged from the surrounding landscape and riverbeds, with river rock being utilized for gabion cages, floors, and walls, and reeds for covering doors and ceilings. The organization also actively salvages discarded items from local dumpsites, repurposing materials such as tires and various construction debris. These salvaged items are ingeniously integrated into the homes as supporting beams (including logs, steel bars, and scrap metal) or retaining walls (using tires, corrugated steel pieces, and gravel).
Furthermore, DesignBuildBLUFF prioritizes the incorporation of recycled, reclaimed, and donated materials. This includes using reject windows and doors, along with any other materials that, for various reasons, were deemed unsuitable for their original purposes. An example provided is a home surrounded by beautiful, solar-friendly glass, which originated from a failed pool enclosure project. To enhance the sustainability and self-sufficiency of these homes, Photo-voltaic panels and rainwater reclamation roofs are also incorporated. The overall construction processes are designed to minimize environmental impact while simultaneously delivering viable and sustainable structures.
The article draws a comparison between the Trombe wall showcased and other examples, noting that while some Trombe walls are made from concrete and slate, the one developed by DesignBuildBLUFF stands out for its simplicity and resourcefulness. This particular Trombe wall is ingeniously constructed from a gabion of wood and wire mesh filled with river rock. Despite its low-tech nature, it effectively serves the same fundamental purpose as more complex designs: acting as a thermal mass that absorbs solar heat throughout the day and gradually releases it into the living space during the night, thereby contributing to passive heating and energy efficiency.
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