I’ve done a bunch of these. If the flat area meets the criteria for concealed 
space sprinklers, use them. In the sloped areas, I try to use single direction 
attic sprinklers if possible.
  

  
The one thing this detail doesn’t show is where the insulation is located in 
the sloped roof area. That would determine wet vs dry.   
  
  
  
Todd G Williams, PE  
Fire Protection Design/Consulting
  
Stonington, CT
  
860-535-2080 (tel:860-535-2080)  (ofc)
  
860-554-7054 (tel:860-554-7054)     (fax)
  
860-608-4559 (tel:860-608-4559)  (cell)
  
  
  
  

  
  
>   
> On Aug 28, 2024 at 9:45 AM,  <Anthony Carrizosa 
> (mailto:[email protected])>  wrote:
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> Brian,
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> Looks like you’re quoting one I did about a month ago.
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> Don’t forget that with a roof slope of  >  4 in 12 and if sprinklers 
> installed where the dimension Perpendicular to the slope exceeds 8’-0” shall 
> have a minimum pressure of 20PSI. I try to avoid that much pressure required 
> and space my heads 8’-0” on center.
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>  Anthony Carrizosa     
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>  Project Manager  |  Fire Protection
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>  7855 S 206th  St Kent, WA 98032
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>  Cell:  206-679-5283  | Office Dir:  253-341-4593
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> From:   Brian Harris  <[email protected]>
>   Sent:  Wednesday, August 28, 2024 5:42 AM
>   To:  [email protected]
>   Subject:  [Sprinklerforum] Interstitial or Attic
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> Quoting a wood framed building with a flat roof in the center. First thought 
> was interstitial heads under it but then got to thinking, since there’s not 
> another floor above wouldn’t attic or upright heads be acceptable instead. I 
> guess I’m wondering if having a floor above is what drives interstitial heads?
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>  Thank you,
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>  Brian Harris, CET
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>  BVS Systems Inc.
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>    bvssystemsinc.com 
> (https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fbvssystemsinc.com&c=E,1,fNefe4uv2J-NRwNaysFp2KsoNrciaKwaRQlCj-2liiOz8y_dBZG1Pc_uVTUVRt86qsbe8Po-FQVxQ86JSh9hGLM6aqSZPECCgRgI4y6-9jbqH1MSgrE,&typo=1&ancr_add=1)
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>  Phone: 704.896.9989
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>  Fax: 704.896.1935
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