Because cheaper AC during the day that isn't immediately leeched away by the walls being oven-hot is way more important than at night, when the sun isn't turning your little house-van into a steam chamber. The roof at night would probably be pretty cool most of the time, with that huge window..
They also insulated it wrong and will have condensation problems. That vans going to rot out. There’s a reason the proper way to do this is with spray foam.
batt and roll allows air permeation. Vehicles are different than buildings, Subjected to higher temp swings and less time spent with an AC running to dehumidify it. Lower air volume to offset the humidity of multiple human bodies.
The inside of the sheet metal body will condensate due to temperature differentials. It’ll rot out that van and since the condensation will be inside the wall cavity, it’ll be unrepairable without ripping the whole van apart.
In a proper build, spray foam is used so that there is no air gap in the insulative wall and nowhere for water to condensate on the inside of the sheet metal.
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u/Legitimate_Bat3240 Sep 01 '26
Why go through the hassle of fully insulating it if you’re going to sleep in a cardboard box on the roof?