In terms of installation, how does double-walled glazing differ from single-pane glass?

Double-walled glazing differs from single-pane glass primarily in the structural requirements due to its design. Double-walled glazing consists of two layers of glass with an air space in between, which provides better insulation and energy efficiency compared to a single-pane glass. Because of this additional layer and the air space, double-walled glazing is typically heavier and requires a more robust frame or supporting structure to support its weight and maintain the integrity of the installation. This makes option C the correct choice, as it accurately reflects the increased structural demands associated with double-walled glazing.

The other options suggest attributes that are not true for double-walled glazing. For example, it does not necessarily require special tools for installation, and while some might think it is quicker to install due to advancements in construction methods, the actual physical characteristics and installation processes often require more careful handling and time. Furthermore, double-walled glazing is not lighter; in fact, it is generally heavier than single-pane glass due to the additional material involved in its construction.