Is an earthbag root cellar a viable option?

Earthbag Root Cellar Design Basics

An earthbag root cellar is a type of underground storage structure built using earthbags, also known as sandbags or polypropylene bags filled with soil. This design provides excellent thermal mass, helping to maintain a consistent temperature between 32°F and 40°F (0°C and 4°C) throughout the year. The earthbags are stacked and stabilized with barbed wire and sand, creating a durable and weather-tight enclosure.

Building an Earthbag Root Cellar

To build an earthbag root cellar, start by digging a trench for the walls, typically 12 inches deep and 18 inches wide. Then, fill polypropylene bags with a mix of soil, sand, and gravel, and stack them in the trench. Use barbed wire to tie the bags together and add additional support with wooden stakes. The walls should be at least 18 inches thick to provide adequate insulation. The door should be designed with a secure seal to prevent air leaks.

Root Cellar Features and Considerations

A well-designed earthbag root cellar should have a smooth, even floor and a slight slope to allow water to drain. The entrance should be designed with a secure seal and a locking mechanism to prevent pests and unauthorized access. Consider adding a ventilation system to maintain air quality and prevent moisture buildup. Earthbag root cellars can be built in a variety of sizes, but a typical size is 8 feet by 10 feet (2.4 meters by 3 meters) with a 6-foot (1.8-meter) ceiling height.