Currently most of the insulation I have installed in the attic is in the rafters of the ceiling. probably close to 18" of high density cellulose. The fire sprin

Currently most of the insulation I have installed in the attic is in the rafters of the ceiling. probably close to 18" of high density cellulose. The fire sprinkler system is dry. I could add another layer of insulation in the roof rafters or not. The building is from 1931 and I added the sprinkler and more insulation in the attic. My heating load is much greater than my cooling load. Most of the other points don't apply to my situation.