Acute Slopes, wood frame construction,Space the heads every 8' on Branch line 
and go up to 15' Up the slopeNFPA 13  2013 edtion Fig
Are you trying to call it Ordinary hazard to get out of this spacing 
Attic heads space every 6', and after testing standard spacing 10' 12' oc roof 
testing did not go so well.
Chuck Bamford SET 

    On Thursday, October 13, 2016 10:33 AM, Brad Casterline 
<> wrote:

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div.yiv3634445993Section1 {}#yiv3634445993 Not much help here, but I try to 
rememberthe fact that Hazard Classifications are based on the quantity, 
combustibility,and heat release rate of the CONTENTS. I think the physical 
challenge of atticfires are light weight wood construction combined with the 
acute slopes, firesgetting through at the eaves making them more undetectable 
until they are in aposition to burn fast and hot. The presence of mechanical 
equipment justcreates more obstructions, shielding, etc., so if I were King I 
would decree "Usethe LH rules except bump them up 1.5X"    :)    Brad     From: 
Sprinklerforum[] On Behalf 
Of rongreenman .
Sent: Thursday, October 13, 201611:50 AM
Subject: Re: Ordinary Hazard AtticSpacing    Opinion: Attics are light hazard 
but seem to have become somethingbetween light and ordinary (probably a good 
thing). So if it's emptyish it's anLH with the attic modifications. If there's 
stuff in it that makes it OH,it's OH. Kind of like when does a platform used as 
a stage actually turn into astage. 

On Thursday, October 13, 2016, James Litvak <> wrote: This 
question goes past the one I just posted. This question assumes anattic with 
mechanical equipment in it is OHI.     So, in an ordinary hazard attic, does 
regular OH design? After all, theincreased start pressure only applies to light 
hazard CC spaces. There'snothing different specified for OH. Therefore, in a LH 
attic spaced 15'x8' theremote sprinkler demand is 14.8 gpm at 7 psi, with a 
5.6K sprinkler.Spaced 10'x12' the remote sprinkler demand is 25.0 gpm at 20 
psi. In an OHattic spaced at 130 sq.ft. the remote sprinkler demand is 19.6 gpm 
at 12.1 psi.It seems strange that a LH attic would have a higher remote 
sprinkler demandthan an OH attic. Am I missing something in the code that 
allows that tohappen?  

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