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
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