Should we insulate under a slab even in an unconditioned space?
We have a +/- 3,000 sq. ft. maintenance building we are designing which is mostly unconditioned space on a concrete slab (there are a couple offices in one area). The primary goal of the slab is to provide a durable and flat work surface for relatively precise vehicle and equipment maintenance. There is always the chance that the building could be re-purposed in the future and insulated and conditioned. We are in climate zone 4. Is the slab less prone to cracking if we install +/- 2″ continuous insulation underneath? or even just 2″ at perimeter?
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