Chapter 03 - Study Problem - Occupancy Classifications and Loads with answers

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Apr 3, 2024

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Chapter 3: Study Problem #1 Refer to the chart “Comparison of Occupancy Classifications” (Figure 3.2 in textbook) for this problem. This chart lists all the occupancy classifications for the International Building Code (IBC) and the NFPA codes such as the Life Safety Code (LSC). Based on this chart, answer the following questions concerning occupancy classifications. Write your answers in the spaces provided. 1. If you were asked to design the interior of a prison located in a jurisdiction using the IBC, which occupancy classification would you use? ______________________________. Institutional, Restrained (or I 3) ‐ Explanation: Prisons are considered Institutional (I) occupancies. Of the four sub classifications listed, I 3 best describes a prison ‐ 2. Using the IBC and the LSC, which occupancy classifications would you use if you were asked to redesign the interior of a hotel? List the appropriate classification for each. IBC: _____ Residential or R-1 ___________ LSC: ____ LSC: Hotels and Dormitories ___________ Explanation: According to the IBC, a hotel would be a Residential occupancy (R 1 specifically). ‐ And although hotels are considered a type of residential occupancy in the NFPA codes, they have a specific sub classification for hotels. So, when using the LSC, you would refer to the requirements for a Hotels and Dormitories occupancy classification. 3. A client asks you to select finishes for a nightclub that he owns. Based on the LSC, what additional information do you need in order to determine the correct occupancy classification? _____ The expected number of occupants (i.e. employees and patrons ____________________ Explanation: Although a nightclub is clearly an Assembly (A) occupancy, the NFPA codes further subdivide Assembly occupancies based on the occupant load. Thus, you need to know whether the occupant load will be 50–300, 301–1000, or over 1000. Each sub classification may have different requirements for finishes.

4. If you are designing the interior of a large assisted living facility that accommodates 150 residents and you are using the IBC, which occupancy classification would you use? Why? Institutional (or I 1), because of the number of residents. ‐ Explanation: The IBC uses the number of residents to determine when an assisted living facility is considered an Institutional (I) occupancy. When more than 16 occupants (not including staff) reside at the facility, it is considered Institutional. If fewer than 16 occupants (not including staff) are at a facility, it could be considered Residential (R ‐ 4). Problem #2 Refer to International Building Code Table 1004.5, “Maximum Floor Area Allowances per Occupant,” for this problem. Based on IBC Table 1004.5 page 10-3, determine the occupant load for the floor plan shown in Figure 3.1, below. The plan is for a retail clothing store on the first floor (at grade level) of a strip mall. Use the occupant load formula to determine the occupant load for this store; write your answer in the space provided.

Figure 3.1 Occupant load: Retail store. Occupant load of Figure 3.1= ____ 27 ____ Explanation: The occupant load is determined by calculating the square footage (or square meters) of the space and dividing it by the occupant load factors found in IBC Table 1004.1.2. You were told the space is a retail store. This is a Mercantile (M) occupancy. Looking on the table under “Function of Space,” there are three categories under “Mercantile.” Because you were told that this store is on the ground floor, you will use the second category, “Basement and grade floor areas.” This allows you 60 gross square feet of area per occupant. Notice, however, that there is also a category called “Storage, stock, shipping areas.” If you look at the floor plan, it shows that the rear of the store will be used for storage. This area will be calculated separately using 300 gross square feet per occupant. (Both categories require gross area, so include all miscellaneous spaces in your calculations. Because there are two different load factors, two square footage calculations must be made. Using the formula Occupant Load = Floor Area/Load Factor, the occupant load is determined as follows:

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