Installing sound dampening material was one of the first things we did after cleaning and prepping the van. For us, this made a huge difference in the mount of road noise we heard while driving. The installation was straight-forward and easy to do.
Tips:
Covering about 30-35% of the interior surfaces in your van is plenty to remove the majority of road noise you hear. When adding additional material, the law of diminishing returns starts to kick in.
Installation Steps:
Cut each of the KILMAT pieces in half
Clean surface with degreaser
For each piece,
Peel off the backing material
Apply piece to any large open areas on the walls, doors, ceiling, and floor of the van
Use roller to get a tight bond (optional)
Notes:
Since most of the road noise was coming from the wheel wells, we covered them completely.