Best materials for building an Earthship home?

Choosing the Right Materials

When building an Earthship home, it’s essential to select materials that are eco-friendly, durable, and suitable for the climate. One of the most iconic features of Earthship design is the use of tires. These can be sourced for free or purchased at a low cost and used to create the walls of the home. A typical tire wall requires about 20-30 tires per linear foot, and can be filled with compacted soil, gravel, or even recycled glass. This not only provides insulation but also helps to stabilize the structure.

Natural and Locally Sourced Materials

In addition to recycled materials, Earthship builders often use natural and locally sourced materials to create a sense of harmony with the surrounding environment. Earthbags, made from polypropylene bags filled with soil or gravel, are a popular choice for building walls. A single earthbag can weigh around 50-60 pounds, and a typical wall section may require 1,000-2,000 bags. Rammed earth, a mixture of soil, sand, and gravel compacted into formwork, is another popular choice for building walls and foundations. Natural plasters made from lime, clay, and sand can be used to finish the interior and exterior of the home.

Insulation and Weatherproofing

Insulation and weatherproofing are critical components of an Earthship home. Natural insulation materials like wool, cotton, and recycled denim can be used to line walls and ceilings. A typical insulation layer may require 2-4 inches of material, depending on the climate and desired level of insulation. Weatherproofing is achieved through the use of natural sealants like beeswax, plant-based oils, and natural latex. These materials can be applied to the exterior of the home to prevent water infiltration and ensure a tight seal.