Common wood sheathing used by builders typically has an R-value of?

The R-value of materials measures their resistance to heat flow, indicating how well a material insulates. For common wood sheathing used in construction, an R-value of 0.6 is often cited. This means that for every unit of thickness, wood sheathing provides a modest level of thermal resistance, allowing for some insulation in the overall assembly.

In the context of building performance, it's important to assess all components of the structure, including the sheathing, as they contribute to the total R-value of the wall or roof system. While wood sheathing contributes to the thermal performance, it’s typically not the primary insulating material used in walls or attics. Instead, other materials, such as fiberglass, foam board, or cellulose, are utilized primarily for insulation due to their higher R-values.

Understanding the R-value of sheathing materials helps inspectors and builders make informed decisions regarding energy efficiency, moisture control, and overall building performance.