Full coverage.... "... , sprinklers shall be installed at top of the shaft..."
Assuming a Flat ceiling @ highest point a lot of stairs around 18' x 8' ceiling area 1. 1 head @ landing and with a Little Giant Ladder another head @ half landing 2. try an Extended Coverage Sidewall ...after some discussions with some experienced installers trying to install 1 Ext. Cov. Pendent in middle above stairs he encouraged me to put 2 heads on plans and put them in middle of landings....... ...and watch out for exit signs blocking coverage... Chuck Bamford SET On Fri, Sep 21, 2018 at 6:03 AM Ben Young <[email protected]> wrote: > I'm curious to see how the rest of the people on the forum handle > protection at the top of the stair shaft, as we have an internal debate in > our office. > > The 2007 edition of the NFPA 13 handbook has an exhibit, 8.29, which is on > page 334, and is involved with 8.15.3.2.1 in the 2007 edition. > > If you're not familiar with the picture, I'll see if I can get a scan, but > its basically a cross section of a stair tower, and has two circled letters > on it: B under the lowest intermediate landing, and A above the top main > floor landing. > > Basically this Exhibit and the explanatory handbook text after 8.15.3.2.1 > implies that the head at the top of a non-combustible stair shaft is only > to protect the top floor landing, and NOT the entire footprint of the stair > tower itself. > > So under this code, the interpretation was that you could protect a 24x10 > foot large stair tower with only two standard spray heads. > > Does anyone else feel this is appropriate? Or how do you feel about the > code/handbook change and the nuance behind this situation. > > I will start with the discussion by saying that I see the appeal of only > installing the one head over the top floor landing as installing another > head at the top over the intermediate landings can often be difficult to do > off ladders, especially if its a very tall stair tower. > > I also can also understand that from an AHJ perspective, 'sprinklers > installed at the top of the shaft' in the code language would be > conservatively read as the ENTIRE top. > > What are your thoughts? > > Thanks, > Ben Young > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >
_______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
