Benefits of using tires in Earthship construction?

Using Tires for Thermal Mass

Tires are an ideal material for thermal mass in Earthship construction due to their high density, which can store and release heat slowly, reducing the need for heating and cooling. A typical Earthship tire wall can store up to 20,000 BTUs of heat per day, making them an effective way to regulate interior temperatures. This is especially beneficial in areas with extreme temperature fluctuations.

Tire Wall Construction Techniques

To build a tire wall, start by excavating a trench 12-18 inches deep and 24 inches wide. Place a layer of compacted gravel at the bottom, followed by a layer of tires. Add a layer of rammed earth or a mixture of soil and cement, then repeat the tire and earth layers. This process is often referred to as a “tire wall sandwich.” The ideal tire wall thickness is around 3-4 layers of tires, with a 1-2 inch gap between each tire for drainage and air circulation.

Tire Wall Insulation and Waterproofing

To ensure airtightness and prevent water infiltration, apply a layer of waterproofing material such as a rubber membrane or a natural sealant like beeswax or linseed oil to the tire walls. Additionally, fill the gaps between the tires with a mixture of soil and cement, or a commercial insulation material like foam board. This will prevent air leaks and ensure a tight seal, reducing heat loss and energy consumption.