What tool should be used to create an opening that's perpendicular to the roof?

To create an opening that is perpendicular to the roof, the Opening by Face tool is the most suitable choice because it allows for openings to be directly created on the face of a roof or other building component at various angles. This tool enables precise control over the location and size of the opening, which is particularly useful when dealing with sloped or non-vertical surfaces, like roofs.

Unlike the other options, which serve different purposes, Opening by Face is specifically designed for scenarios where the opening needs to conform to the shape of a surface that is not parallel to the level of the building. The tool can be easily adjusted to cater to the angle and orientation required, ensuring the opening is created accurately and effectively.

In contrast, other tools do not align with the purpose of creating such a specialized opening. For instance, Shaft Opening is typically used for vertical openings that extend through multiple levels, Vertical Opening is specifically designed for openings that need to remain vertical and is more suited for walls, and Wall Opening is exclusively intended for creating openings through vertical wall assemblies. Therefore, the Opening by Face tool stands out as the most appropriate for this specific task on a roof.