RV.Net Open Roads Forum: Rust on exterior, from inside drip rail/rain gutter.

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Open Roads Forum  >  Tech Issues

 > Rust on exterior, from inside drip rail/rain gutter.

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Woodtroll

Appalachian Mtns, SW Virginia

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Posted: 11/04/18 06:43am Link  |  Quote  |  Print  |  Notify Moderator

If I understand your last post correctly, you are going to caulk the underside joint between the drip rail and the sidewall, which is only going to trap water behind the drip rail. The fact that rust is running down your wall means that water is getting through the screw holes in the gutter, and maybe all the way into your wall. If you stop the water from running out from behind the gutter, where will that water go?

As you've already been advised, I think the smart thing to do is remove and replace the screws, and caulk behind each one as you go. You can do them one at a time, so you don't have to remove the gutter. If you don't stop the water from getting behind the gutter, you are going to have bigger problems.

It is also possible that the builder didn't seal the top edge of the gutter, where the rubber roof tucks behind it. While you're up there, clean and caulk this joint as well. The Geocell caulk you mentioned should be a good choice for both jobs, just stay away from silicone caulk.

Finally, make sure your gutter is cleaned out, straight, and drains water. It looks as though it's trapping and holding water, judging from those rust stains at the screws.

Good luck!
Regan


2003 F250XL 4WD 7.3L Crewcab LB, 6 speed; Prodigy brake controller; Big Tex grille guard/ deer deflector. Canoe hauler and camping truck extraordinaire!
2003 Layton 242 Scout- Extra batteries, solar panels, LED lighting, and propane for boondocking.


Ralph Cramden

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Posted: 11/04/18 06:56am Link  |  Quote  |  Print  |  Notify Moderator

apr67 wrote:

So as it turns out I was kinda wrong and right.

The head of every screw holding the drip rail on is rusty as hell. However the only rust on the side is where they failed to caulk the underside.

So I am going to caulk it and ignore it, knowing that Jayco did a cr@p job and that this driprail will fail and delam down the road.


Looking at the picture thats a sure sign of lack of maintenance.

Either the gutter was full of debris for a long period of time allowing water to lay in that area getting into the snap in trim, or the snap in trim cracked or pulled out of the extrusion. The screws would not rust that much on a 2016 in a few years unless something allowed water to be in constant contact with them.

You can blame Jayco, but thats the same way just about every, if not all manufacturers do a roof termination at the sidewall. The top of the rail appears well sealed to the roof membrane in the picture.

apr67

Tallahassee, Florida

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Posted: 11/04/18 10:55am Link  |  Quote  |  Print  |  Notify Moderator

Ralph Cramden wrote:


Looking at the picture thats a sure sign of lack of maintenance.

Either the gutter was full of debris for a long period of time allowing water to lay in that area getting into the snap in trim, or the snap in trim cracked or pulled out of the extrusion. The screws would not rust that much on a 2016 in a few years unless something allowed water to be in constant contact with them.

You can blame Jayco, but thats the same way just about every, if not all manufacturers do a roof termination at the sidewall. The top of the rail appears well sealed to the roof membrane in the picture.


The gutter was and is not full of debris, and even if it was, the screws are a good 1/2" above the gutter. The snap in trim is in fine shape, but its no match for rain driven at 55mph. The problem isn't maintenance, its either poor choice of screws or poor finish. Every screw, on both sides of the RV has a rusty head just like the ones in the example.


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