Which of the following is NOT a strategy for effective insulation and air sealing?

The strategy that does not contribute to effective insulation and air sealing is painted exterior surfaces. While painting external surfaces can enhance aesthetics and potentially protect materials from weathering, it does not directly affect the insulation value or the air sealing capabilities of a building.

Effective insulation and air sealing strategies focus on minimizing air leaks and ensuring that thermal barriers are in place. This includes practices such as installing drop soffits to create effective thermal boundaries, providing adequate attic ventilation to manage moisture and prevent heat accumulation, and utilizing knee wall attics to insulate sloped ceilings effectively. These techniques contribute directly to a building's energy efficiency and comfort by controlling heat loss and preventing drafts. Therefore, painted surfaces should not be seen as a strategy for insulation or air sealing.