Lot line window sprinkler protection: In the design drawings I have lot line window protected with standard concealed sprinklers. This same sprinkler is used to protect the whole room on the inside. Distances to all walls are less than 7'-6". The room is light hazard, and this only occurs in a single room.
Is this acceptable or should the window be protected by one sprinkler and a separate sprinkler for the room protection? Also, is a standard pendent acceptable or would you rather have a Tyco Window Sprinkler (special application) for the window? Thanks in advance. Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
9 Comments
Wayne Ammons
8/3/2020 07:36:35 am
I am not entirely sure what a “lot line window” is but window (glazing) protection is its own beast and must be protected with sprinklers specifically listed for that application. You will need to design and install them in accordance with NFPA 13 as well as the very specific criteria outlined in the sprinkler data sheets. Collaboration with the architect may also be required to confirm the construction of the windows.
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Wayne Ammons
8/3/2020 07:43:25 am
I will also add that Tyco has a new concealed style window sprinkler that may be helpful when it comes to the aesthetics of the project.
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Franck
8/3/2020 10:21:38 am
I don't know what the AHJ would require in your area.
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Casey
8/3/2020 11:25:49 am
There is a LOT to this topic and it gets very complicated, very quickly. make sure you know what edition of codes are driving this. I believe IBC/IFC states that you can use standard spray sprinklers when allowable per NFPA 13. Double check that, but there is mention in there about standard spray. It does not sound like you are trying to maintain a wall rating, but more of exposure protection from an adjacent building that is too close.
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8/3/2020 11:52:11 am
I'm assuming based on the term "Lot Line" that you are in the NYC area as that is the only place I've heard that term used before - please correct me if my assumption is wrong.
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Aaron
8/3/2020 01:51:19 pm
You must know you'r stuff to deduce that!
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8/3/2020 02:07:42 pm
Aaron,
Artur
8/3/2020 03:42:02 pm
Thank you!
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Brian Gerdwagen FPE
8/3/2020 01:47:57 pm
You also need to look at Table 705.8 of the IBC, assuming it is codified, that allows what percentage of opening in a wall allowed as determined by distance to the FSD/Property Line. Less than 3', you are not allowed openings. Meaning that windows need to be rated like a wall, not a protected opening.
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