![Air Seal](https://cdn.treehouseinternetgroup.com/uploads/photo_gallery/medium/180211-5aea05834c215_20171207114020.jpg?v=1525284521)
Air Seal
During an air seal, a polyurethane expanding foam is prayed around fixtures and walls that air may flow freely through. This eliminates air leaks from the home.
![Blown-in Cellulose](https://cdn.treehouseinternetgroup.com/uploads/photo_gallery/medium/180212-5aea0579aaab3_20171208095947.jpg?v=1525284521)
Blown-in Cellulose
After the air seal, cellulose insulation is blown into the space to help keep inside temperatures, inside.
![Dense Packing - Cellulose Insulation](https://cdn.treehouseinternetgroup.com/uploads/photo_gallery/medium/180213-5aea057eb8643_20171208110759.jpg?v=1525284521)
Dense Packing - Cellulose Insulation
Small holes are cut into the side walls of the home and are filled with insulation from the foundation up.
![Dense Packing](https://cdn.treehouseinternetgroup.com/uploads/photo_gallery/medium/180214-5aea05755814b_20171208110806.jpg?v=1525284521)
Dense Packing
After the walls are filled with insulation, the holes are sealed off and the siding is replaced.