Air Sealing Around Original Details

Implementing Passive techniques in historic rowhouses can be challenging, and this townhouse is no exception. When the original, ornate plaster crown could not be removed, it had to be incorporated into the continuous air barrier. The angled shelf below the crown creates a transition for the liquid applied air barrier to bridge from masonry to plaster crown, and the top of the crown is open from above to install blocking back to the masonry to apply the continuous seal. This is another example of how each historic Passive retrofit has unique details that continue to evolve through our practice.