Revisions log for Answer #1895

On the floor slab means "cold roof". Under the roof means "warm roof." It's important that warm, moist air can escape outside. If you only have a pantry upstairs but a warm roof, you should plan for windows in the gable so that there is ventilation. With a cold roof, the air should circulate enough on its own and you won't need ventilation.

I contend that a cold roof is cheaper in terms of costs (construction, energy). In storage, however, you have to consider the summer/winter temperature differences. The climate in this case is about the same as an unheated tool shed.