So to stop the sound, you need to stop the panels flexing as much as you can (“dampen” them), and then muffle any remaining sound energy they produce. That makes the wall panels flex (resonate) and create the same noise inside the van. You also get some noise transferred from the road through the suspension and into the vehicle frame. The flexing recreates the same sound on the other side. Sound waves hit the metal walls of your van. The R value measures how well a material stops heat from being conducted through it, but not how well it prevents convection or radiation. The unit of measurement most people use is the R value. Insulation is measured by how good it is at preventing heat from getting through. If you stop air from moving close to the hot metal on the inside of the van, it won’t be able to warm up from the radiated heat and then move that heat inside through convection. You stop convection by filling gaps so the air can’t be transported. That creates air currents to move the heat around inside the van. Warm air is lighter, so it rises and pushes cold air down. Once the sun’s heat gets radiated inside the van, it heats up the air in the van.
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