Did you arrive at 72% using the nominal dimension of the wood or actual dimension.
Best Bruce Verhei > On Jul 26, 2017, at 08:19, Roland Huggins <[email protected]> wrote: > > The conservative answer is put sprinklers beneath the ceiling fixtures BUT: > > I wouldn’t apply the gridded ceiling criteria here since that is a sub > ceiling that covers the entire plane (beneath the sprinklers) and consists of > rather small opening. > > If anything, I’d look at it like a cluster of obstructions to determine > whether to combine them in defining the overall width. This is only found in > the ESFR section (which is much more conservative than the CMDA approach > required not just for the performance issue but the fact that the fire > challenge is much greater than a LH or OH scenario) > > Keep in mind that the primary goal is to control the upper temperature so as > to avoid flashover. We are talking LH or OH - right? Granted the water > pattern to the floor is going to be whacked (well for the areas with a 7” > spacing) but will the ceiling features interfere with controlling flashover? > Another question is, will the sprinkler beneath the features even activate > (except when the fire is directly beneath it)? > > I don’t think the simple conservative approach is accomplishing anything > except providing a warm fuzzy but it does allow the job to move forward. So > until NFPA 13 addresses it (NEXT CYCLE), discuss it with the AHJ BEFORE > submitting your plans > > Tom, since we don’t want you talking to yourself, feel free to call me. > > Roland > > > Roland Huggins, PE - Senior VP Engineering > American Fire Sprinkler Assn. > Dallas, TX > http://www.firesprinkler.org > > Fire Sprinklers Saves Lives > > > > >> On Jul 25, 2017, at 11:04 AM, Thomas Reinhardt <[email protected]> >> wrote: >> >> Question. The general has informed me that they want to put in a tartan wood >> ceiling at various spots. The wood slats are 1’-6” deep and just 2” wide, >> but are spaced at various dimensions- some as wide as 3’ apart-some as close >> as 7”. The with uprights will be at least 2’-4” above the top of wood. If >> they have to protect underneath would mean dropping pendants between wood >> slats with the deflector 1”-6” below the bottom of the wood. This could be >> quite an installation problem. NFPA 13 section 8.15.14 relates as long as >> ceiling is 70% open and the depth of the material does not exceed the least >> dimension of the opening, below protection is not required. Well the open >> ceiling is 72% open. Unfortunately the depth of the material does exceed the >> least dimension of the opening. I believe that below protection is required. >> Thus meeting the code. Sorry so long any input would be greatly appreciated. >> Thanks >> Tom Reinhardt >> Fire Inspector/Plan Reviewer >> Skokie Fire Department >> 7424 Niles Center Road >> Skokie, IL 60077 >> Office: 847-982-5342 >> [email protected] >> >> _______________________________________________ >> 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
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