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I had to chuckle a little bit about the concept of a "vapor barrier" on my car. If they are there, they don't seem to be doing much LOL. How crucial are these?
I had to chuckle a little bit about the concept of a "vapor barrier" on my car. If they are there, they don't seem to be doing much LOL. How crucial are these?
My understanding is that the door skins are not sealed from the outside, so the vapor barrier exist to keep water from splashing from inside your door, to inside your cabin, on your door trim, etc.
I replaced mine using M-D Building Products 04796 8 mil sheeting and 3M 08578 black strip calk, since the stock barriers were pretty much totally destroyed on my car. I am pretty happy with how it came out.
I just disassembled my doors to overhaul the window mechanisms, latches, and mirrors. There are three drains inside the bottom of the doors to let the water out. Given all the silt that was sitting in the bottom of my doors I'd say there has been quite a bit of water running through them over the last 23 years. Looking at the interior door card below, what ever spray foam stuff they used to form the card I'm sure that some tenacious nasty strain of mold would love to grow in that. So yes, the doors should have a barrier to keep the door cards dry.
Last edited by mdp; 03-28-18 at 05:21 PM.
Reason: Added door card picture