Horse stall mat, vinyl coin matting and closed cell foam make a good sound damping combination over the factory wood floor of the van. Flanged l-track holds the three layers in place.
We painted the metal van floor and reinstalled the wood floor with some closed-cell foam underneath it. That wasn’t enough insulation though.
For a combination of heat and sound insulation, we went with a layer of closed cell foam (Low-E foil faced 1/8″ foam), 3/8″ rubber stall mat and 2mm (~1/16″) hard-wearing non-slip vinyl coin-grip flooring.
Each of these layers serves a different purpose. The closed cell foam is a heat insulation layer and it also lets the stall mat float freely above it. This makes the stall mat into a great sound dampening layer. Car audio fanatics use mass loaded vinyl in a similar way. The stall mat has a similar density to mass loaded vinyl but is much thicker. The non-slip vinyl layer on the top provides some protection for the floor and is more visually appealing than the rubber stall mat.
All of these products come in four foot widths, but the van floor is around six feet wide. To hold the three layers down without needing to glue them in, which would ruin the sound dampening effect, we ran strips of l-track from the front to the back of the van about 12″ in from each wall. This lines up really nicely with one of the raised areas in the metal floor.
You can get l-track installed in the van from the factory, but that is recessed into the wooden floor and glued in place. We wanted our l-track to sit on top of the wooden floor. The space behind the flanges is 1/2″. That’s just right for the three layers of flooring material we are using when they are compressed together. The flanges of the l-track hold the layers in place really firmly.
We bolted the l-track through the wooden floor, through the metal base of the van, and through Unistrut steel channel under the van to add strength to the bolts and also to provide a mounting point for anything we want to attach under the van.
The floor feels firm to walk on but slightly cushioned. It cuts down considerably on the road noise coming in to the van. There are some wrinkles in the top coin layer from where it was rolled up so tightly but they are smoothing out as we use the van.