I use it as an extra layer but I bought it instead of the paneling for 5 entrance doors. That's about 1/3 the thickness. Replaced a very old strip as a test (fortunately before I took it all off), light and air came through just the same as without the strip. I will be buying some personally as I should have and maybe it could be an extra layer or used for windows or another project. :/ on the photo is my old worn stripe next to the new one. These are very thin rubber bands, similar to strips.
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