Most of the warehouse buildings are constructed using typical pre-engineered metal structures and metal roofing sheets that does not carry any insulation on it.
Two types of heat exist in a warehouse metal building, one is radiant heat and other is conductive heat. Radiant heat transfers through air and conductive heat transfers through materials or objects that are touching one another.
The storage materials of a warehouse building as well as the concrete flooring usually absorbs heat. This makes surface temperature inside the building much hotter than actual air temperature.
The best way is to prevent the heat near the source and it is mostly happens at roofing and secondly at side walls and doors.
There are different types of insulation materials available for different applications in the market.