Chapter 03 - Study Problem - Occupancy Classifications and Loads with answers
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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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Space Load Factor Size of Space Floor Area Occupant Load
Retail area 60 gross 48.5 × 31 1503.5 sf 1503.5/60 = 25.06
Storage area 300 gross 14 × 31 434 sf 434/300 = 1.45
Using the calculations for feet and inches, the total occupant load is 25.06 for the retail area, plus
1.45 for the storage area. This equals 26.51, which rounds up to 27. (The codes indicate that you
should always round up when a total results in a fraction.)
Problem #3
Refer to International Building Code Table 1004.5, “Maximum Floor Area
allowances per Occupant,”
A.
Figure 3.2 shows the floor plans of four single-story buildings; In which plan could the Business (B) occupancy or use be considered an accessory to the main occupancy classification? Write the letter of the
plan selected and explain your answer: ___
A & B less than 10 %
__
B.
Based on IBC Table 1004.1.2, determine the total occupant load for the building in Plan A below. The educational E use is primarily classrooms. Write your answer in the space provided. Occupant load of Plan A (below) =
E – under Table 1004.5 Educational/ Classroom area – 20 net. Plan A shows it to be 5000 SF OL formal 5000/20 = 250
Fig 3.2
C.
What would be the occupant load of Plan B?
Plan B is Mercantile: 9125 SF / 60 gross =152 O.L. 875 SF/ Storage of Mercantile 300 875 SF/ 300= 2.91
152 plus 3 = 155
D.
Plan C, is S-1 considered an incidental use or a Mixed occupancy?
Mixed – 10% of 5100 = 510 sq. feet the storage is 900 sf. E.
Plan D, what kind of separation if any would be between F & S-1 and where do you find this information? Look at table 508.4 Separation between Storage and Factory – N unless it is S1 then its 1 hour if sprinkled and Non sprinkled 3