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In wood frame construction where sprinklers are required in blind spaces such as floor and roof cavity, can the  sprinkler heads be omitted if the materials meet the flame spread and smoke contribution required for a FRTW rating?

Question asked by on Sep 9, 2016
Latest reply on Oct 13, 2016 by psmith

I am looking at various way to reduce sprinkler requirements primarily in type 3 construction and would like to use FRTW equivalent materials to prevent the spread of fires in places like floor truss and roof truss cavities. This would be preferred to filling the space with insulation which compromises the fire rating since no testing has been done to confirm that the system would pass one hour with the additional insulation in the space. I am particularly interested in the use of other methods during manufacturing that would not necessarily be pressure treated but would meet the flame spread and smoke contribution of 25 on the thirty minute extended testing as required for FRTW.