Q-List I purchased some Mastic pads that we use in our business. It's called Scotch 2200 Vinyl Mastic Pads By 3M. For Insulating and moisture-sealing with vinyl backing. Comes in a box of 10 pads 6.5" X 4.5" X .125" These have the vinyl so they won't be sticky on one side. You should be able to get them without the vinyl backing. Pat Korach Kirkland, WA