Retrofitting can be defined into two major categories

Building Envelope Sealing

 

The effectiveness of a reasonable air-tight building should not be overlooked. The air barrier for the building envelope can help control unwanted infiltration as well as reduce energy consumption while improving comfort.

Fort the case shown there is a 50% building envelope air-leakage improvement. 

building%20envelope_edited.jpg

Before

Air-leakage source acknowledged

measurement.jpg

After

Air-leakage source fixed