What indicator may suggest the presence of knee walls during a size-up?

The presence of knee walls in a structure can often correlate with the type of roof design and its associated materials, which is reflected in the responses given during a size-up. Specifically, a flat roof is a common architectural feature where knee walls are often utilized to create additional usable space, typically in attics or upper levels. Therefore, when observing a flat roof, an indicator may suggest internal configurations such as knee walls, which are vertical walls that support the roof and are particularly prevalent in buildings with flat roofs.

The material of the shingles typically pertains to the weatherproofing and aesthetic qualities of the roof rather than architectural features like knee walls. Meanwhile, the height of the building and the type of windows provide useful information for assessing structural integrity or egress but do not directly indicate the presence of knee walls. Thus, focusing on the roof and its profile is key in identifying the likelihood of knee walls during a size-up.