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Old 04-21-2015, 08:35 AM   #1
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Finding roof leaks

Heavy rains last week demonstrated some issues, and it looks like most are seams, as they all stopped when I moved the bus uphill - all but one. The one dripping on to the driver's dash. The primary suspect is this guy. Not sure what it is or purpose, or even what problems I will cause if I caulk it/remove it?

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Old 04-21-2015, 08:49 AM   #2
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That should be a vent to let bus breathe, on mine when I removed it, it had a lip upwards about 3/8 inch high, so a leak from there not likely UNLESS the rivets are leaking

can you look inside of it and see if it has a lip?
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Old 04-21-2015, 09:25 AM   #3
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Spray some koolaid on the suspected leak spot and see if the color appears inside. Just my 3 cents.
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Old 04-21-2015, 09:52 AM   #4
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not sure how to look inside of it?
this is what it looks like on the inside.... directly below

looks like mold?



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Old 04-21-2015, 10:01 AM   #5
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I had one of those. Supposedly it is to allow air in / out for expansion and contraction of the air when the bus is in the sun and for day / night or whatever. Unless your bus is super airtight I don't think it is necessary. I took mine out and patched over it. No issues yet. Mine had that nasty mold under it on the panel not necessarily from leakage but probably just years of air / condensation coming through.

To find leaks, I simply went out in the bus when I had the interior totally stripped (ceiling panels out too) during a heavy rainstorm and made sure I had some bright halogen lights on inside. I had probably 6 or 7 different leak spots on mine, several from the roof hatches which I replaced with units from another member here and resealed. Some were leaky rivets which I just gobbed silicone over. Others were seams at the sheet metal. I used some gooey rubber roof caulk from Home depot to seal ALL seams on the roof (if you PM me to remind me I will link it to you). Finally, I used elastomeric roof paint to paint the roof white (heat reflection) and used a 4" brush over the riveted areas on the roof, and just slathered the pain on there real thick. All the other areas I just rolled it. That took care of all but one of my leaks which came from a side panel gap in an area where a lot of water was running down the side of the bus. That one I just undid / broke off the screws (Thomas built bus which uses screws instead of rivets in many places) and riveted it into place with some automotive seam sealer.
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Old 04-22-2015, 07:43 AM   #6
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so I simulated a repair, and a rainstorm yesterday, with no leaks. Maybe I will leave the repair and wait for the next rainstorm? I hesitate only because I fear results of removing the vent. Would that not cause MORE moisture?
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Old 04-22-2015, 07:50 AM   #7
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I have a similar vent that leaks horribly.
My solution was to buy a new rv roof vent. Yeah it requires cutting. But I figure one can't have too much ventilation.
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Old 04-22-2015, 09:43 AM   #8
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Just remove that that roof vent. It's not needed.

You would be better off adding a vent in the rear cap of the bus at the highest point.

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Old 04-24-2015, 05:15 PM   #9
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Talking

Well I got to cuttin and pryin today........




then I had to administer a beat-down, to make the roof "flush" for the new patch.







post beat down



patch installed, lotsa sticky jelly underneath and around edges




remnants





results tomorrow after the storms
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Old 04-24-2015, 06:08 PM   #10
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Great pics.

I like the steps shown in pics form.

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