# PDD Practice Exam 2 Case Study

Would anyone can clarify the difference between window and window wall? One of the case study questions include the line saying all the windows are 9’-0" in total height, but no indication for window wall height, so I use the 16’-0" floor height for window wall. But according to the answer explanation using 9’-0" height for window wall also. I would like to know clear definition to prevent this confusion between window and window wall.

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Hi @smoriny

Sorry for the delay here. @coachchrishopstock do you mind helping with this case study?

Hi @smoriny and thanks for your question.
For this case study question, the reference document showing the floor plan indicates a ‘window wall’ behind the elevators. The question then states:
Every window (across both buildings) is 9’-0” in total height, including both existing windows and the proposed window wall.

Given the above, the window wall is defined as 9’ in height (just like all of the new and existing windows on the floor).

I hope this answers your question!

Still little confusing, the plan indicate both the window and window wall. The question only states every window is 9’-0", so I assume only the windows are 9’-0" and window wall to be full height in this case using ceiling height; 16’-0". Can anyone explain window wall definition? Is there any difference between the window and window wall? Typically windows usually do not call out as window wall.

Hey @smoriny

A window wall is a type of window (just like bay windows, clerestory windows, etc. are all types of windows). The question notes that every window is 9’ tall - since window walls are types of windows, they’re 9’ tall based on this information. The question further clarifies that the window wall in question is indeed included in this classification, by saying that this 9’ height includes both existing windows and the proposed window wall. See the bolded text below:

Every window (across both buildings) is 9’-0” in total height, including both existing windows and the proposed window wall.

The Visual Dictionary of Architecture lists a bunch of different descriptions and sketches of window types. They note that a window wall is (paraphrasing) a non-bearing wall composed primarily of vertical and horizontal framing members containing a combination of fixed and operable sections.

Thank you for your description and clarification.