Scott, If you go to the definitions of Obstructed and Unobstructed construction, it talks about the construction type impeding the heat flow or water distribution. Apply that to your situation. 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 Feb 16, 2022 at 12:53 AM, <Scott Harvey via Sprinklerforum > (mailto:[email protected])> wrote: > > > > 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 struct ure 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] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
