What are the advantages of flexible foam?
Any foam such as HealthySeal that adheres to building materials, must remain flexible in order to maintain its air seal. Buildings expand and contract with changes of season and temperature. If the foam is too rigid, it will inevitably develop cracks along the studs and ultimately the air seal will be destroyed. While other types of non-rigid insulation such as batts and loose fill cellulose can slip, sag, or settle, leaving uninsulated gaps. Blower door tests have shown that a home insulated with semi-rigid HealthySeal foam, with no polyethylene vapor barrier, measures 1.2 ACH at -50 Pa. depressurization. This is well within the 1.5 ACH rating for the most energy efficient home.
