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NFPA CWBSP Exam - Topic 4 Question 28 Discussion

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.
A) 0.70 gpm/ft2 over 2000 ft2 (28.5 mm/min over 186 m2)
B) 0.70 gpm/ft2 over 2500 ft2 (28.5 mm/min over 232 m2)
C) 0.85 gpm/ft2 over 2000 ft2 (34.6 mm/min over 186 m2)
D) 0.85 gpm/ft2 over 2500 ft2 (34.6 mm/min over 232 m2)

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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Cassie
5 hours ago
This question is tricky. I think it’s about understanding the criteria well.
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Rodrigo
5 days ago
0.85 gpm/ft2? That seems high for just a pile of plastic!
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Felicia
11 days ago
Wait, why is everyone picking A? C seems more appropriate.
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Lauran
16 days ago
Not so sure about A, I lean towards C.
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Eric
2 months ago
Definitely A! That seems to be the standard.
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Leota
2 months ago
I think it's A, 0.70 gpm/ft2 over 2000 ft2.
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Rory
3 months 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
3 months ago
I feel like the minimum design criteria should be higher for nonexpanded plastics, so maybe C or D could be correct.
upvoted 0 times
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Yasuko
3 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.
upvoted 0 times
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Joaquin
3 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.
upvoted 0 times
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