Quick Answer
SELECTING FIREWOOD FOR CORDWOOD MASONRY INVOLVES CONSIDERING THE SPECIES, MOISTURE CONTENT, AND DENSITY OF THE WOOD TO ENSURE PROPER INSULATION AND STRUCTURAL INTEGRITY. THE RIGHT CHOICES CAN IMPROVE THE EFFICIENCY OF THE WALLS AND EXTEND THE LIFE OF THE BUILDING. A WELL-SELECTED FIREWOOD CAN MAKE A SIGNIFICANT DIFFERENCE IN THE OVERALL PERFORMANCE OF THE CORDWOOD MASONRY. ---
Species Selection
When selecting firewood for cordwood masonry, choose species with high density and natural resistance to decay and insect damage. Hardwoods like oak, maple, and ash are ideal due to their high moisture resistance and ability to hold their shape. Softwoods like pine and spruce are not recommended as they tend to be softer and more prone to decay.
Moisture Content and Kiln Drying
It’s essential to ensure the firewood has a moisture content (MC) of 20% or lower to prevent mold growth and improve insulation performance. Kiln drying can be an effective method to reduce MC, but it may not be feasible for large quantities. However, properly seasoned firewood can achieve MC levels around 20% within 6-12 months, provided it’s stored in a well-ventilated area.
Cordwood Wall Construction and Insulation
To ensure the cordwood walls are well-insulated, use a mortar mix with a higher sand-to-cement ratio, which will help reduce thermal conductivity. Aim for a mix with a sand-to-cement ratio of 3:1 to 4:1. Additionally, consider using recycled materials or natural insulation materials like wool or hemp to enhance the thermal performance of the walls. Properly constructed cordwood walls can achieve R-values of R-10 to R-20, depending on the species, MC, and mortar mix used.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.