When the width of an addition is less than the width of the main portion of the house, their roof spans are what?

When the width of an addition is less than the width of the main portion of the house, the roof spans will indeed be unequal. This stems from the geometry and design of roof structures. The main portion of the house provides a certain span determined by its width, which will differ from the addition if it is narrower.

In carpentry and building construction, a roof's span is the distance between the supports of the roof structure, and it is influenced by the width of the building below it. When two sections of a building have differing widths, the roofing system must accommodate each width accordingly. The addition's narrower width will affect the angle, pitch, and load distribution of the roof, leading to differences in the actual spans required for support.

This concept is crucial in architectural design, as it ensures structural integrity, aesthetic alignment, and effective water drainage from the roofs. Thus, acknowledging the unequal nature of roof spans in this scenario is essential for successful construction practices.