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Old 06-16-2017, 09:01 PM   #1
rouxguy
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Water Intrusion

We noticed bedroom ceiling water stains in the area under the ac unit. We had some monsoon type weather a few weeks ago. Is it possible rain came in through the ac unit? Any insights appreciated, thanks

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Old 06-16-2017, 11:16 PM   #2
Stripit
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Yes it is possible. Might be worth climbing up on the roof (carefully) and remove the a/c cover shroud. There will be 4 lag style bolts holding down the a/c unit. they are not torqued to a high number, but need to be uniformly tightened down. I've had one bolt looser than the others allowing a trickle of water to enter that corner. Might be worth a check to see if you have something like that happening.
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Old 06-17-2017, 07:44 AM   #3
wingnut60
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There is also a reseal kit available from Dometic (assume this is the AC brand) and with a little help, the unit can be lifted up and away, the reseal applied and the AC replaced and tightened down properly. Can also check for wood rot while the AC is off the hole.
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Old 06-26-2017, 02:05 PM   #4
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I pulled the shroud this morning, there was one of the four bolts that was not a tight as the other three. Snugged all four of them up some - hope that helps. Not sure what I can do about the stained ceiling panel though. Thanks!
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Old 06-26-2017, 02:07 PM   #5
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Yes, they are Dometic. Hope that is not the case though. Thanks
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Old 06-26-2017, 03:56 PM   #6
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I used Folex that is a carpet cleaner in my small carpet cleaner with a hand held wand that I used on the ceiling. Folex can be bought at Home Depot and comes in a 1 quart spray bottle. You could just use it out of the bottle and blot the stain out too. It really did a nice job on my stain.
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Old 08-25-2017, 06:03 PM   #7
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Wing-Nut, I brought the Rv in to a dealer to see what they could do for the water intrusion. Given it had only been about 8 weeks since it happened, I was surprised to hear they want to replace the WHOLE roof. They claim the AC's were installed without caulking the lag bolts. What are your thoughts? I think I can remove and recaulk all those bolts myself. The water caused some minor ceiling discoloration but no real, major damage. Your insight is appreciated - Mike
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Old 08-25-2017, 06:36 PM   #8
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Wow, replacing a roof is not something I would take lightly. If what they say is true, and you can verify that no wood rot has taken place, I would do as your thinking, unbolt the lag bolts, lift the a/c unit and caulk with the correct sealant. I have lifted my a/c units to replace the seal, not a big job at all. I did use a caulking to reseal the bolts when I put them back in, no leaks, no issues at all.
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Old 08-26-2017, 08:29 AM   #9
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Thanks, did you inject caulk in the bolt holes? Did you also apply caulk around the heads of the lag bolts? The dealer seems to think when the Ac were installed at the factory, they should have caulked the bolt heads - which they say caused the leak
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Old 08-26-2017, 09:41 AM   #10
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Yes, The 4 lag bolts were removed, the a/c unit rolled on its side, as there was plenty of power cord to allow that to happen on my unit. I needed to replace the seal as it was not stopping the slight water leak when it rained hard. I purchased the foam/rubber type material on a roll about 3 inches wide and maybe 15 ft long somewhere? I removed the old seal, came up off the roof top very easy. Cleaned the roof at the seal area well, cut the new seal stuff to fit tight. Used an automotive black rubber sealer to fill in the seams where I cut to stop any water from creeping through anywhere. Then used a rv sealant, forgot the name to fill the bolt holes and about 1/2 an inch around each bolt. Then set the a/c unit back down and actually used my torque wrench to torque the bolts to whatever the speck called for and then a touch more. Never had a leak again. If you over tighten you squish the seal down and it could leak, the seal needs to seal, but not be crushed. That was how i did it. I don't think from start to finish it was more than 45 minutes. Also a 1 man job. My wife would NOT go up on the roof, so just me.
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