What Happens If You Use Dirty Snow for Igloo Walls?

Igloo Wall Instability

Using dirty snow can compromise the structural integrity of your igloo. Dirty snow has a lower melting point and higher water content compared to clean snow. When this dirty snow melts, it can cause the igloo walls to collapse or become unstable. A safer option is to use clean, powdery snow with a higher water content of less than 4% and a temperature below 15°F (-9°C) for optimal construction.

Melting Rate and Wall Thickness

The melting rate of dirty snow can be significantly higher than clean snow, leading to a faster collapse of the igloo walls. To mitigate this risk, make sure to use a wall thickness of at least 2 feet (60 cm) to provide adequate structural support. A wall thickness of 2.5 feet (76 cm) or more is even more recommended, depending on the temperature and snow quality.

Alternative Options and Maintenance

If using dirty snow is unavoidable, consider using it for the base layer of the igloo, as it will be less prone to collapse. Once the base layer is in place, use clean snow for the upper layers to ensure a sturdy and long-lasting shelter. Regularly inspect and maintain your igloo by checking for signs of melting or structural damage, and make repairs as necessary to ensure its safety and durability.