Roof leak

[Billysurf]

We have a roof leak (various spots depending on how the coach sits).  They are above windows, so I need to seal the air conditioner units and marker lights I'm thinking.  Anything else?  What do I use to seal this? 

[DoubleEagle]

My experience is with Eagles, but the problem should be similar. You have to check the roof and trim areas very carefully, a single missing rivet or screw can cause a leak. Test the emergency exit windows with a hose as well, the gaskets can get stiff and not seal well after decades of use. Loose or missing gutter mounting screws can leak a lot of water. Sometimes the screw looks okay, but is actually loose and passing water.

[Billysurf]

That's a ton of stuff I hadn't considered!  Really appreciate the info!

[Mike in GA]

I had some very pesky roof leaks that took me forever to track down. I caulked all the seams on the roof  checked the rivets, checked the roof emergency exit gaskets, antenna bolts, drip rail screws, etc.
     The real culprit turned out to be hard, ydry gaskets on my clearance lights and a couple with cracked lenses. I ordered all new light sets from Luke in New Jersey and then reinstalled using a good silicone caulk. Bottom line no no further leaks. Your experience may very best

[eagle19952]

What do I use to seal this? 

pick a color.

http://www.ositough.com/en/colored-caulk.html

[daddysgirl]

If you can, check them and seal them from the inside. Look at the nearest frame piece to make sure they haven't caused a rust issue. That old fiberglass sits there on the metal...wet.
I used Wet-R-Dry with the fabric, and I am adding some fiberglass to the inside rear ceiling cap and around the lights.

[daveola]

We had endless water leak issues that we finally fixed with two solutions (on our MCI 102A3)

1) The windows are designed to actually be able to collect water in channels at the bottom - the key is that those channels have drain holes, and if they get plugged then the channels fill with water which can eventually drain into your walls and onto the floor.  We kept trying to seal the windows properly until we realized they were supposed to route the water to our drains which were clogged.  We unclogged the drains and that problem was solved!

2) We kept getting drips all along our roofs after very carefully sealing all the roof vents and A/Cs.  Turned out that our paint was getting old and was the only thing keeping water out from the seams.  So I cleaned all the seams with a small flat-bladed screwdriver and covered them with clear, flexible silicon caulk.  No more roof leaks!  If only I'd figured that out before it hit my word floor and warped a section of it. 

[Billysurf]

UPDATE:  We found out it definitely is the AC unit in the front. We had it repaired but they ended up doing more damage a few small drips here and they're turned into continuous drips to the point that we actually need a bucket.   Also, if used to be if the bus was leaning a certain way it would all go to the outside with no water inside the coach.   The people who fixed it said that it was installed incorrectly on that roof hatch, the roof hatch was not modified. Thet also said that the drip pan may be cracked.  Over the next few weeks we're heading to Maine from Virginia. Any good roof AC repair people?

[bigred]

Tell them to forget all the drama and just install a new AC gasket!!! End of problem!!!

[buswarrior]

silicon is a devil...

Seals everything up for awhile...

And then nothing else will stick very well, other caulk or paint.

You will thank yourself in the future for getting spendy on name brands now.

happy coaching!
buswarrior

[Billysurf]

Tell them to forget all the drama and just install a new AC gasket!!! End of problem!!!

They did!  It's worse now...

We are in the Shenandoah Valley, CA this week, heading toward Roanoke next week.  Any A/C people that make house calls?

[Dave5Cs]

When you set the temperature set it just below the ambient temp and then back it down slowly from there. If you set it 65 degrees and it is 100 out. It will keep running and then ice up and water will be dripping in the coach.

[Billysurf]

Thanks Dave!  Trying now....