filling voids

[andyselec]

Has anybody filled the voids , like columns, empty wall panels with expanding foam for insulation and noise reduction?

[RDinNHandAZ]

I didn't on this van but did use it “Gaps and Cracks” to glue in some polyisocyanurate panels where the walls were flat enough like the rear window spaces. I've done it before on a previous van and if you do BE VERY CAREFUL not to fill the space as the foams expands with force and will deform the outside skin of the van.  I’d stuff them with a hydrophobic fiber like glass fiber, or thinsulate if you are rich.