In the 80's I used Floor Leveler, it's a concrete based mud that pours on a floor seeking its own level, usually used for small dips or gouges. Thing is it cracks when applied too thick and you need to use it in layers.Echo said:Ok so... lets say I used two layers of raammat in my astro.
In areas with ridges like the floor... do I put down some sort of filler first to make it flat, or follow the floor contours?
Next layer on the floor, wood or something between like jute mat?
What about those "sound deadening tiles" ? Do I need those or just the mat and foam for the nooks and crannies?
Now... the walls amd cieling. After the mat is hung, can I put a layer of 1/8 ply for rigidity then carpet?
Im talking about a cargo with bare steel walls here.
I took care of most of the cracking issues (still had some hair line cracks, but that doesn't matter with any floor covering over it) by cutting strips of an old cotton sheet and laying it with each application between the ribs. I'm sure you could use jute, plain canvas or cheese cloth as well. It gets as hard as a rock.
My opinion is that this helped a lot with noise and insulation, but I have no idea of any R value or db reduction as it was done to level the floor in a Dodge cargo van that was customized, and it worked well. Plywood went over that, then carpet pad and carpet. All I can say is that I drove the van as I did the layers, used it and I could tell a big difference after a couple layers, I think I did 4 layers and it was quiet. When done it was quieter than a Caddy.