Hatsuwr

Took apart my doors to install some new speakers, and found the insulator material was completely trashed. By door insulator, I mean the clear/black plastic piece that seals between the door frame and panel.




Right now I am thinking about using some 6 mil plastic sheeting:
https://www.amazon.com/gp/product/B00KOOF5W0/
And applying it with either 3M spray adhesive or rope caulk, depending on which one seals best while still being removable.

Any thoughts on how to do this a bit better? That plastic sheeting is pretty thin compared to what was on there originally, and I'm wondering how much sound/thermal/material insulation is actually provided by the original part.

Bustedback

It's more of a vapor barrier to keep moisture out. If you want to quiet down the interior you can use a sound deadening insulation like Boom Mat or Dynamat. I lined the whole floor of my JK with sound deadening mat that had a heat reflective backing, it help a lot with heat and noise.

dave1123

The MAJOR reason it's there is to keep all the rainwater from entering the cabin and destroying the stuff in the doors, like your speakers!