Why is it important to have an air gap between brick and framing?

Having an air gap between brick and framing is crucial for several reasons, but in this case, the main reason it is correct that this gap adds insulation lies in the thermal performance of the wall assembly. An air gap can provide a buffer that reduces heat transfer between the exterior brick and the interior framing. This gap helps to create a layer of still air, which acts as an insulator. It minimizes the amount of heat that escapes in cold weather and reduces heat gain in warm weather.

Furthermore, the air gap can help to prevent moisture accumulation. Excess moisture trapped between the brick and the frame can lead to problems such as mold, mildew, and wood rot. By having this gap, it promotes airflow that can reduce humidity levels, thus improving the overall comfort of the building and maintaining the integrity of the materials.

While there are other potential benefits associated with an air gap, such as pest prevention and enhancing structural stability, those factors are secondary in relation to the insulation properties and moisture management that an air gap provides.