Wood framing accounts for 24% of conventionally framed walls and 14% of advanced-framed walls. This represents a large thermal hole since wood has about one-fourth the thermal resistance of most insulation materials. This problem is effectively addressed with a continuous thermal blanket of rigid foam installed on the exterior of the walls, either over the sheathing or in place of the wood sheathing. Advantages include blocking heat transfer through the studs, reducing drafts, and minimizing the risk of moisture problems by shifting condensation temperatures outside of the framing cavity.