NFPA 13R area served by riser
NFPA 13R area served by riser
(OP)
Do you know if the NFPA 13 restriction of area served by a riser (e.g. light hazard 52,000SF) applies to NFPA 13R?
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NFPA 13R area served by riser
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RE: NFPA 13R area served by riser
My answer would be no but only because how would it be possible to design a use group R building larger than 52,000 sq. ft. without having to have a NFPA 13 compliant system?
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RE: NFPA 13R area served by riser
You could have a single story 10k sq ft R2 occupancy, of V-B construction and require a full 13 system if the architect took an area increase for sprinklers.
This is just a pet rant of mine. You can't divorce the governing code from the standard.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 13R area served by riser
RE: NFPA 13R area served by riser
What Nfpa standard and section are you getting the limitation from???
RE: NFPA 13R area served by riser
1.1* Scope. This standard shall cover the design and installation of automatic sprinkler systems for protection against fire hazards in residential occupancies up to and including four stories in height in buildings not exceeding 60 ft (18 m) in height above grade plane.
OK, so there is a limit of 52000 per riser, so just install two risers!!!!!!!!!!!!!
6.1 System Protection Area Limitations.
6.1.1 The maximum floor area on any one floor to be protected by sprinklers supplied by any one sprinkler system riser or combined system riser shall not exceed 52,000 ft2 (4831 m2).
6.1.2 The floor area occupied by mezzanines shall not be included in the area limits of 6.1.1.
RE: NFPA 13R area served by riser
I can't tell you how many times I have seen individuals design a sprinkler system for a 3 story building thinking that 13R is applicable because it is less than 4 stories and residential. However, the governing building code says otherwise.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 13R area served by riser
506.4 Single occupancy buildings with more than one story. The total allowable building area of a single occupancy building with more than one story above grade plane shall be determined in accordance with this section. The actual aggregate building area at all stories in the building shall not exceed the total allowable building area.
Exception: A single basement need not be included in the total allowable building area, provided such basement does not exceed the area permitted for a building with no more than one story above grade plane.
506.4.1 Area determination. The total allowable building area of a single occupancy building with more than one story above grade plane shall be determined by multiplying the allowable building area per story (Aa), as determined in Section 506.1, by the number of stories above grade plane as listed below:
1. For buildings with two stories above grade plane, multiply by 2;
2. For buildings with three or more stories above grade plane, multiply by 3; and
3. No story shall exceed the allowable building area per story (Aa), as determined in Section 506.1, for the occupancies on that story.
Exceptions:
1. Unlimited area buildings in accordance with Section 507.
2. The maximum building area of a building equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.2 shall be determined by multiplying the allowable building area per story (Aa), as determined in Section 506.1, by the number of stories above grade plane.
RE: NFPA 13R area served by riser
IBC Section 506.4.1 exception 2 essentially says that you can increase the height of the building using a NFPA 13R system but to increase the area, one would be required to use a NFPA 13 system. Common examples of this are pedestal construction where they use the sprinklers to increase the area of the Group B/A/M occupancy at grade plane, then subdivide the buildings with fire walls so they can use NFPA 13R systems for fire protection. I just reviewed such an animal this week at our former airport now hipster kids town center.
RE: NFPA 13R area served by riser
RE: NFPA 13R area served by riser
I have been told that the areas are split by fire walls and the areas were not increased.
RE: NFPA 13R area served by riser
RE: NFPA 13R area served by riser
This allows for the use of a NFPA 13R rather than NFPA 13 design.