Where there is a stack, the desire to have as many floors of the building as possible, coterminous with stack floors, determines the height of stories at 14 or 15 feet, as the 7 or 7½-foot stack is chosen, and this will make rooms whose heights, plus thickness of floors (unless some use can be found for mezzanine rooms), are exact multiples of stack heights.
In a larger library (but still small), a second story over part or the whole of the main floor, can be lighted from above and be used for many purposes.
Basement. The height of a basement will depend on the uses contemplated for it. An auditorium requires more height than small rooms for storage, vault, or janitor service. Miss Marvin advises a height of 10 feet, so that it can be used in any way wanted in future.[175]
“A failure to use it is a defect.”
It must be absolutely dry, and fairly warm.
“A well-lighted basement gives more dignity of elevation to a small building.”—Bluemner.[176]
On a sloping site, a basement becomes ground floor, and a cellar becomes basement, for part of the building, with dark cellars and sub-cellars for the other part, which will come handy for heating plant, fuel, storage, and other functions. As the stack can run up and down from the main floor, such a site can be made useful in many ways.
Upper stories become more and more difficult to use unless there are elevators, which are costly to install and costly to run. In old houses, coming as a gift, the upper stories can be used for storage, study rooms, class rooms, trustees, and other departments infrequently needed.
The top floor, where there are elevators, may be one of the most useful stories, the most useful next to the ground floor, because the possibility of good top light allows every square foot to be used. If there are only three stories, the top may be used for many purposes without elevators, if the stairs are easy and ample. The principal uses are, for serious reading rooms, exhibitions, small study or class rooms, historical rooms, special libraries or departments.