Self healing fibers have received a significant level of interest primarily with applications for inclusion in reinforced concrete as a crack management strategy. These "smart fibers" have been added as discrete elements within the concrete matrix. The self-healing fibers are primarily fluid-filled hollow capillaries that contain a bonding agent that, when released, slow or prevent the spread of a crack through the concrete matrix. Self-healing fibers have also been proposed as a strategy for addressing debonding events between the concrete matrix and reinforcing bars. Another application is proposed for this type of smart fiber. The management of the transfer of heat through an exterior wall is an important aspect of the thermal performance of that envelope; one that is substantially compromised by air infiltration and exfiltration. Standard building practice, especially in residential construction, usually requires that a membrane be applied to the building volume to reduce the movement of air between the interior and exterior. Any discontinuities in this membrane may allow for the passage of air to and from the exterior. Self-healing fibers, as an inclusion within the weave of an air/vapor barrier textile, will be studied as a strategy for passively sealing the miscellaneous discontinuities that arise during the application and lifetime of the membrane.