Is It Possible to Retrofit Insulation to Existing Cordwood Walls?

Insulation Options for Cordwood Walls

Cordwood walls can be retrofitted with insulation using various methods, including blowing insulation into the cavities between logs or applying exterior foam board insulation. When choosing an insulation option, consider factors like R-value, moisture resistance, and compatibility with the cordwood mortar mix. For example, spray foam insulation can be applied to the interior of the log cavities, providing an R-value of 6-8 per inch, while exterior foam board insulation can be attached to the exterior of the logs with a specialized adhesive. It’s essential to ensure that the insulation does not compromise the structural integrity of the cordwood walls.

Preparation and Installation Techniques

Before retrofitting insulation to the cordwood walls, it’s crucial to inspect the structure for any signs of damage or weakness. If necessary, repair any gaps or cracks in the mortar joints to prevent moisture intrusion. To install insulation, start by drilling small holes in the log cavities to create a path for the insulation material. Use a high-pressure insulation blower to fill the cavities with insulation material, such as cellulose or fiberglass. Alternatively, apply exterior foam board insulation to the walls, ensuring a tight seal around windows and doors to prevent air leaks.

Cordwood Mortar Mix Considerations

When applying insulation to cordwood walls, it’s essential to ensure that the insulation material does not compromise the integrity of the cordwood mortar mix. Some insulation materials can react with the lime-based mortar, causing it to degrade over time. To mitigate this risk, use a lime-based mortar mix that is specifically designed to be compatible with insulation materials. Additionally, apply a breathable, water-resistant barrier to the exterior of the walls to protect the insulation from moisture and extreme weather conditions.