Anyone knowledgeable in the use of lead sheeting for sound proofing ? I have an 2800 Onan generator Im going to install under my van. I'm building my own mounts incorporating 5 anti vibration mounts and I was going to coat the plastic generator cover with 1/32" lead sheeting. I have 1/4" closed cell foam I was going to sandwich the lead. What happens if I only cover the foam on one side or no sides on the top as I'm trying to mount it as close as I can for maximum ground clearance. The ventilation ports will not be covered. I think I understand you need foam to allow the lead sheet to absorb vibration/sound but do you need it on both sides?