I found gaps under the cabinets that I could slide a sheet of stiff, close to cardboard, piece of paper under. If I had room to slide it around I applied talcum powder on top of the paper, liberal amounts, and then spread that around the area. Probably not as effective in damp areas. Seemed to work well at quieting the area but I have an area at the foot of the bed that needs a reapplication after several years.
Paul and Janet Braun
2003 Toyota 4Runner V8 now 2012 Toyota Sequoia V8
Escape 19' 2010 now 2014 Escape 21'