This seems like one of those great communication with AHJ/Owner opportunities.
A deck is an exterior projection. I am assuming the deck is wood, and no fire-resistant stuff. The only thing height wise is the 24" for obstructions over 4 feet, and the 48" for stages, with stipulations. IMHO, the spray pattern development is not as big a concern with properly spaced and the lower heights as suppression will most likely occur. At 8 feet, there will Def be storage under them if this is a residential environment. The sprinklers will more than likely serve as impingement type, as the channels formed by the studs, and the open nature negates proper ceiling jet. R/ Matt Please rate our customer service<https://survey.medallia.com/?emailsignature&fc=3539&bg=Fire%20and%20Fabrication> Matthew J. Willis, CWBSP, CET Engineering Designer IV FERGUSON FIRE DESIGN, LLC A Wholly Owned Subsidiary of Ferguson Fire & Fabrication, LLC 401 N 5th Street Suite 448 Wausau, WI 54403 C: 307-236-8249 [email protected]<mailto:[email protected]> www.FergusonFire.com<http://www.fergusonfire.com/> From: Taylor Schumacher <[email protected]> Sent: Wednesday, March 8, 2023 6:15 AM To: '[email protected]' <[email protected]> Subject: [Sprinklerforum] Low Decks Is there any guidance on sprinkler protection under decks that are really close to finished grade? I have a 13 project with combustible decks that range from 1 foot to 8 foot above finished grade. Common sense tells me these short ones won't allow spray pattern development and replacing/testing will be a nightmare but I have nothing to fall back on. Thanks, Taylor Schumacher Security Fire Sprinkler<http://www.j-berd.com/> 1 Industrial Blvd | Sauk Rapids, MN 56379 Office: 320.656.0847 | Direct: 320.640.7050
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