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Old 09-09-2015, 05:49 PM   #1
Inertiaman
 
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Default Sealing lower trim, water in rocker panels

After 2 months with virtually no rain in Seattle, we finally had some rain in the past couple weeks, some of it pretty heavy. Since my interior lower panels were removed for my work, I noticed some pretty significant water pooling in the bottom of the rocker panels. The water is obviously entering through the plastic trim connectors which hold the black trim that is all around the lower van body.

The 1/8" deep puddles in some spots of my rocker panels occurred without even driving. Just parked on level ground during a solid rain.

I did some searches but couldn't find any threads on this specific topic. Has anyone tried to reduce/eliminate this ingress? If so, how? Sealing the holes/connectors from the inside? Removing trim and doing something on the exterior?

The rocker panels have some pretty thick yellow overcoating and drain holes, so to some extent they are capable of handling water. But if I extrapolate to 10 years of repeated water ingress, I worry that it will lead to corrosion and/or fungus. Already there black tracks where the water trickles in, though its hard to tell if that is fungus or residue/sediment from trim material.
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Old 09-09-2015, 06:48 PM   #2
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Default Re: Sealing lower trim, water in rocker panels

The black stuff is likely just dirt/dust collected behind the trim and then washed inside with the water. We used 3M window weld slathered over each clip where it comes inside. It took a couple applications to get some of them to stop dripping. Spraying undercoat or bed-liner over them doesn't seem to do the trick completely.
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Old 09-09-2015, 07:33 PM   #3
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Default Re: Sealing lower trim, water in rocker panels

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We used 3M window weld slathered over each clip where it comes inside.
Applied from the inside, just trying to cover the entire clip and hole?

Was there a rationale for using 3M window weld as opposed to something like Dicor or similar sealant?
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Old 09-10-2015, 12:55 AM   #4
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Default Re: Sealing lower trim, water in rocker panels

I used Sikaflex to seal the plug.

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Old 09-10-2015, 03:41 AM   #5
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Default Re: Sealing lower trim, water in rocker panels

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Applied from the inside, just trying to cover the entire clip and hole?

Was there a rationale for using 3M window weld as opposed to something like Dicor or similar sealant?
Applied from the inside. Window Weld because I had it on hand. Lots of other great sealants available. Sikaflex is one.
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Old 09-10-2015, 06:16 AM   #6
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Default Re: Sealing lower trim, water in rocker panels

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Window Weld because I had it on hand.
A solid rationale for lots of things!

Thanks, first I'll try my leftover sealant from my Maxxfan install.
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Old 10-11-2015, 04:19 AM   #7
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Default Re: Sealing lower trim, water in rocker panels

Found another puddle today after some persistent rain. This is with the vehicle parked, not driving. Despite having sealed each trim panel plug from the inside with two applications of sealant over a month ago, water is still getting into at least some of the lower wall areas. In particular, the lower wall about 4 feet rear of the driver seat. There was maybe 1/4 cup of water sitting in a puddle just forward of the C pillar. The lower part of my Thinsulate was soggy from sitting in the puddle.

I've glued in Thinsulate since my original observation of water, so I can't inspect each plug very well, but they were HEAVILY sealed with sealant, so I'm surprised one or more of them could be passing this much water. The interior of the outer lower black trim plastic must be holding a substantial amount of water that is leaching through into the van walls over time??

It just seems odd that a brand new 2014 van would permit that much water ingress "by design."

??
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Old 10-11-2015, 06:35 AM   #8
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Default Re: Sealing lower trim, water in rocker panels

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Originally Posted by Inertiaman View Post

??
Same old problem as the T1N.

Drill some holes so the water can at least get out, thats what I did on my T1N.
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Old 10-11-2015, 07:39 AM   #9
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Default Re: Sealing lower trim, water in rocker panels

I recall a post and pics of sealant applied at the top of the trim panel outside. Any thoughts against that?
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Old 10-11-2015, 10:58 AM   #10
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Default Re: Sealing lower trim, water in rocker panels

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I recall a post and pics of sealant applied at the top of the trim panel outside. Any thoughts against that?
Thats exactly what i was thinking,bead of sealant on top of trim
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