new sloped roof construction over existing flat roof

I have run into a situation where a builder wishes to construct a new wood truss roof over an existing flat roof with a BUR. The wood construction is allowed due to smallish size. The roofing material will now be inside an attic space and in my opinion should be removed due to violation of smoke and flame indexes however I can only find info about the smoke and flame spread for interior finishes...I have talked to the fire marshal and he is all for it due to the reduction in fire load...
Thanks!
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