Thermal Boundary Investigation
The thermal boundary of the home can be defined as the place in which the inside of the house (conditioned space) is separated from the outside of the house (unconditioned space). The thermal boundary investigation requires looking at all six sides of of the separation points (top, bottom, back, front, left and right). The thermal boundary can also be described as the "envelope" of the home with the difference being the thermal boundary is actually the insulation in place to make the home more efficient and comfortable.
Check out this typical attic inspection during a BGE home energy audit in Baltimore County Maryland
Example 1 - Kneewall Insulation
Thermal image of uninsulated kneewall from the inside of the home.
A highly prevalent problem with the thermal boundary in many houses in Maryland is the insulation condition at kneewall locations. A kneewall is an interior wall that is adjoining to an attic space (outside). Unlike an exterior wall that has a wall assembly (and insulation in most cases) to give it a greater R-value, the kneewall is usually only drywall hung to the framing and if not treated, can play a huge role in comfort issues as well as excessive energy bills. Examine what this looks like in the photos to the right.
Building Performance Institute
BGE Approved Energy Contractor