What design options do I have with a fire sprinkler design to address protection underneath a 45-degree pitched roof?
Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
8 Comments
Franck
11/3/2020 10:14:13 am
We may need more information on what design parameters you want some guidance. There are so many.
Reply
Jonathan Sullivan
11/3/2020 10:46:27 am
Not doing a lot of storage design, can you explain the logic of a false ceiling? Is it a question of activation time?
Reply
Franck
11/3/2020 11:12:36 am
If you have a large peak roof with a slope >16.7%, you cannot protect it with NFPA (out of the scope of NFPA 13).
Jonathan Sullivan
11/3/2020 01:02:57 pm
Thanks Franck. Is this an implied or explicit slope limit? I checked Ch. 1, 10, and 20 of 13-2019 and didn't see this 16.7% stated. I do doubt my reading comprehension sometimes.
Franck
11/3/2020 03:08:38 pm
NFPA 13 - 2019 Edition
Jonathan Sullivan
11/3/2020 03:23:47 pm
Thank you for the reference. To conclude, as that section is for storage occupancies, NPFA 13 would still be applicable if the slope is greater than 2 in 12 in a non-storage occupancy.
Franck
11/3/2020 03:23:09 pm
It is one of the few "dark" areas of NFPA 13 where there is no proposed solution, either than just "out of the scope of NFPA 13".
Reply
Chris
11/3/2020 10:29:39 am
There is some information still needed. You say you have a 12:12 pitch on your roof. What is the structure? Combustible or non-combustible? What is the distance from one eave to the other eave across the roof? Dry system or wet? If dry add an additional 30% onto your remote area. And due to the pitch of the roof, you will have an additional 30% area increase to your remote area.
Reply
Leave a Reply. |
Free SignupSubscribe and learn something new each day:
CommunityThank You to Our Top
February '21 Contributors!
Your PostThe ToolkitSprinkler Designer or Engineer?
Get all of our tools, including the Sprinkler Database, Friction Loss Calculator, Fire Pump Analyzer and more: Filters
All
Archives
March 2021
Daily
Daily discussions are open-ended fire protection, fire alarm, and life safety questions submitted anonymously for the benefit of sharing expertise and learning from other perspectives. Anyone can submit a question here:
Exam Prep2020 PE Prep Guide
(Available Now!) PE Prep Series
(Available Now!) 2020 PE Prep Series
Current Leaderboard (Click to enlarge) PE Problems
Visit July-October for daily Fire Protection PE Exam sample questions.
Solutions are posted the day after posting. Comment with your solutions, questions or clarifications. Please note that questions posted are unofficial and in accordance with NCEES rules are intended to be similar to actual exam questions, not actual exam questions themselves. |