What Craig and Travis said.  From a performance perspective, I always liked the 
“double density” approach where you prove the required density for the hazard 
that mostly characterizes the use and then a smaller hot spot for the more 
hazardous aberration.  So EH2 per Chapter 11, and also a .6/900 sq. ft. or 
something like that.

SL

From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On 
Behalf Of MFP Design, LLC
Sent: Thursday, May 17, 2018 8:29 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: RE: Misc Rack Storage

When you have mixed criteria areas, you need to extend the higher density into 
the lower density area for 15’.  Reference NFPA 13: 12.3 for that requirement.  
Also, don’t forget the issue of complying with 23.4.4.1.1.4.

[MFP_logo_F]
Travis Mack, SET
MFP Design, LLC
3356 E Vallejo Ct
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:tm...@mfpdesign.com<mailto:email:tm...@mfpdesign.com>

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From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf 
Of John Irwin
Sent: Thursday, May 17, 2018 8:23 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: RE: Misc Rack Storage

Regardless of the trailers, do I need to provide .6/2000 for the racks? If so, 
do I need to do that for the entire 5,000 sqft area? Seems excessive.



John Irwin
DynaFire Inc. – “Same Day – Next Day”

From: Sprinklerforum 
<sprinklerforum-boun...@lists.firesprinkler.org<mailto:sprinklerforum-boun...@lists.firesprinkler.org>>
 On Behalf Of Steve Leyton
Sent: Thursday, May 17, 2018 11:19 AM
To: 
sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>
Subject: RE: Misc Rack Storage

I tend to agree – trailers potentially shielding fire load within from 
sprinklers above (5.4.2).

SL

From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On 
Behalf Of Fpdcdesign
Sent: Thursday, May 17, 2018 7:06 AM
To: Sprinklerforum
Subject: Re: Misc Rack Storage

Wouldn’t the trailer storage bring it up to EH2?

Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 (ofc)
860-553-3553 (fax)
860-608-4559 (cell)

On May 17, 2018 at 9:47 AM, <John Irwin<mailto:john.ir...@dynafire.com>> wrote:
Here’s the situation … I have a 5,000 sqft, (currently) ordinary hazard mixed 
use space. The new tenant intends to store two emergency disaster management 
trailers in this space. However, along two walls, they want to put a 3-teir 
rack with storage up to 20’ in height. TOS in the center of the unit is 23-9.

The racks will contain a mix of group A plastic, emergency supplies in plastic 
totes, with lids, on non-combustible pallets.

Do I really have to upgrade this entire space from OH II to .6/2000?

Do I tell them they should just not store over 12’?

John Irwin
Fire Sprinkler Specialist
DynaFire, Inc. – “Same Day – Next Day”
727-282-9243 – Cell

“A customer is the most important visitor on our premises. He is not dependent 
on us. We are dependent on him. He is not an interruption on our work. He is 
the purpose of it. He is not an outsider on our business. He is a part of it. 
We are not doing him a favour by serving him. He is doing us a favour by giving 
us an opportunity to do so.”


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