Tyco BB-1 (I don't thnk there's a problembut I have never run into this one before) 1

[SprinklerDesigner2]

I have an existing office that requires an NFPA 13 system which requires sprinklers in the attic.

The attic is straight forward; 4 in 12 pitch and not a whole lot in the way of diagonals but it does have spray on insulation that's a good 4" thick.

The owner will have duct moved if it blocks spray... some places it is a clear run but there are others that will require relocation of ducts but that isn't what I have questions on.

It's really not obstructed construction anymore. You got the one diagonal on each side and the 4"x1" horizontal stiffener piece at the peak and while I don't see anything that would prohibit the use of Tcyo BB sprinklers [URL unfurl="true"]https://www.tyco-fire.com/TD_TFP/TFP/TFP610_08_2014.pdf[/url] I felt safer asking here before I went ahead.

Strange time of year for me; normally I might go a whole year without questions on a job but I have three in a row right now that I am just not completely sure of.

Oh, on the plus side the attic will be heated so at least I don't have to deal with a wet system.

If nobody isn't sure I can ask Tyco's tech department on Monday but I would like to get this proposal put together before then.

 

[cdafd]

So can you be 16 - 22 inches below peak???


If so does that help?

 

[stookeyfpe]

Based on the building photos (thanks for that) a single branch line at the roof peak using the Tyco BB-1 sprinkler should be adequate and the design pressure and flows are consistent for the span width. What you defined as a "smoke wall" is a draft curtain so for the purposes of hydraulic calculation, you can use it as a basis for establishing the design area boundary. The area is not a candidate for the small room rule but the draft wall appears to be gypsum wall board or gypsum panels, so depending on how it's built, it can be treated as a fire barrier under NFPA 13 Chapter 11 rules.

 

[MatthewJWillis]

I am not sure the draft stop or any other factor can influence the design area.
The Tyco attic sprinklers are Specific Application.
The design area and number of sprinklers are defined in the listing and the data sheet.
Other than that, the attic indicated here seems a prime candidate for Attic Sprinklers.
In fact, I'm a bit envious..

R/
Matt

 

[SprinklerDesigner2]

Matt,

There's only one draft stop and I was just pointing out what it was. There's about 30 attic sprinklers that are going to be required; about 15 on each side of the draft stop so I will be calculating five heads on a wet system.

It certainly is not my area but I was talking to an architect friend of mine that told me there were studies out showing attics with insulation at the roof line, instead of the batt or blown insulation we so often see on the bottom chords, is actually more energy efficient. Who would have guessed this?

Attic wet systems makes me feel like I am living in southern Florida.

As far as attics go it is the easiest I've ever done. No hips and very little obstruction once they lower the duct work.