Please remove my email from sprinklerforum mailing list, delete sub On Wed, Feb 16, 2022 at 8:55 AM Prahl, Craig/GVL via Sprinklerforum < [email protected]> wrote:
> What are the depths of the joists, the depth of the insulation and the > spacing between the joists? > > Craig Prahl | Jacobs | Group Lead/SME – Fire Protection | > [email protected] | www.jacobs.com > 1041 East Butler Road Greenville, South Carolina 29606 > CONTACT BY: email or MS TEAMS > > > > -----Original Message----- > From: Sprinklerforum <[email protected]> On > Behalf Of Scott Harvey via Sprinklerforum > Sent: Wednesday, February 16, 2022 12:53 AM > To: [email protected] > Cc: Scott Harvey <[email protected]> > Subject: [EXTERNAL] Obstructed vs Unobstructed Construction > > Hi all, I have a question for the group. > > I've got a storeroom, ceiling is open to structure. The roof structure is > solid wood joists, which are fully insulated between each joist. > > We have installed standard spray upright sprinklers with the deflectors > approx 8-10 inches below the bottom of the joist/insulation. > > In my mind, this is unobstructed construction, because per "A.8.5.4.1 Batt > insulation creates an effective thermal barrier and can be considered the > ceiling/roof deck when determining distances between deflector and > ceiling." Chapter 3 defines Obstructed Construction "Panel construction > and other construction where beams, trusses, or other members impede heat > flow or water distribution in a manner that materially affects the ability > of the sprinkler to control or suppress a fire". > > Now that I look at this again, I'm thinking I am wrong and should be > obstructed construction because although the batt insulation creates a > thermal barrier (similar to a smooth ceiling) the structure is still the > same, so I would need to keep my upright sprinklers max 6-inches below the > bottom of structure? > > Would appreciate input from the group. > > > Thanks, > > Scott Harvey, CET > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org__;!!B5cixuoO7ltTeg!WNJbuEDrG9DqZDyEL512vMojwZ-VOZeVutCjsR6asnXWsu5WOOUl9NA1aE0ZoG95hg$ > > ________________________________ > > NOTICE - This communication may contain confidential and privileged > information that is for the sole use of the intended recipient. Any > viewing, copying or distribution of, or reliance on this message by > unintended recipients is strictly prohibited. If you have received this > message in error, please notify us immediately by replying to the message > and deleting it from your computer. > _______________________________________________ > 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
