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NFPA CWBSP Exam - Topic 4 Question 28 Discussion

Actual exam question for NFPA's CWBSP exam
Question #: 28
Topic #: 4
[All CWBSP Questions]

What is the minimum design criteria to protect an exposed nonexpanded Group A plastic stored in a solid pile to a maximum height of 15 ft (4.6 m) in a 26 ft (7.9 m) high building? Piles to be stable with closed arrays.

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Suggested Answer: A

To protect exposed nonexpanded Group A plastic stored in a solid pile up to 15 ft high, a design criteria of 0.70 gpm/ft over 2000 ft is typically required. This density and area coverage account for the high combustibility and potential heat release of Group A plastics.


by Colby at Apr 07, 2026, 12:57 AM

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Eric
18 days ago
Definitely A! That seems to be the standard.
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Leota
23 days ago
I think it's A, 0.70 gpm/ft2 over 2000 ft2.
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Rory
1 month ago
I thought the closed arrays meant we needed to focus on the larger area, which might point to option B, but I’m not entirely confident.
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Ahmed
1 month ago
I feel like the minimum design criteria should be higher for nonexpanded plastics, so maybe C or D could be correct.
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Yasuko
2 months ago
I remember practicing a similar question where we had to determine the water application rates, but I can't recall the exact numbers.
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Joaquin
2 months ago
I think the answer might be A, but I'm not completely sure about the specifics of the flow rates for Group A plastics.
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