[Greenbuilding] Sprinklers-was fire ratings and PU foams

[Stewart Abbey]

I am currently building in a rural area where by the time the fire dept gets there the house will be almost burnt to the ground.  I would also be interested in anyones experience with residential sprinklers.  I am using rockwool insulation with exterior
foam sheating (2nd's at 1/2 price from local manufacturer). Trying to keep the styrofoam away from the interior living space.
Stewart

       
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