Chapter 5:                      Walls

This chapter discusses air sealing and insulation for walls in existing buildings. Air sealing begins by inspecting the disconti­nuities in walls, such as the following.

       Inside and outside corners of walls.

       Openings for windows and doors.

       Protrusions and indentations in walls.

Insulation begins by evaluating the existing wall insulation and deciding on the cost-effectiveness of installing additional wall insulation. Other wall-insulation issues may include the follow­ing.

       Whether to insulate from interior or exterior of the home.

       How to open a wall cavity and restore it after insulating the wall cavity.

       How to install insulation to the wall’s surface.