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Old 12-09-2013, 02:45 PM   #1
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Leak or condensation from ceiling light?

First, a weather report... It's been less than freezing over a week now in Seattle without precipitation. Lots of frost and the little lake we are near is frozen. We have been able to keep our pipes from freezing, but neighbors have not been as lucky. We have a 2012 Thor Daybreak 34KD.

We have been running an electric heater and our furnace pretty frequently for awhile now. Today, I noticed drips from the middle ceiling light. It's not a steady stream and there's nothing really wet on the roof.

Condensation or leak? Should I get my motorhome leak tested?

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Old 12-09-2013, 02:59 PM   #2
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Are your windows free from condensation? If so, it could be a leak.

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Old 12-09-2013, 08:27 PM   #3
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Living in an RV during cold weather produces a lot of humidity just from your breath, add cooking and you should see condensation on your windows, especially surrounding metal trim.
Pepper2 told of the warning sign.
Remove the ceiling fixture and see what is behind it, if you don't see moisture it is humidity/condensation.
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Old 12-09-2013, 09:01 PM   #4
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You should crack some vents and windows to get some air flowing through. I know you don't want to let cold air in but moisture in the air needs to get out somehow. Unless you have rigid foam in the ceiling cavity, I think you're more likely to have condensation problems than a roof leak, esp. being in the PNW.

Cooking, showering and bodies all release a lot of moisture into the air and it will condense on colder surfaces. Unfortunately, the way RVs are built, what is essentially a vapor barrier, is on the wrong side of the insulation and moisture will get through to the cold roof and exterior wall surfaces and condense if its a batt type insulation. Can't see on the Thor website what insulation type is in the ceiling.

You could look at getting a dehumidifier. A hygrometer like this one at Walmart would be good to get to see what your relative humidity level is.

Indoor Hygrometer With Comfort Scale | Walmart.ca
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Old 12-09-2013, 09:21 PM   #5
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I have thread running that begins "water, water everywhere". It is one the National RV forum. The subject is condensation it turns out. I thought I had a leak but after listening to some experienced people and some deductive reasoning I know we are fighting condensation.

This is our first winter in the Pacific NW. Usually by now we are in Arizona or California. We have been learning the routine of condensation. We had a virtual sauna once we got the heat going. All of it centered in the bedroom slide out.

Guess what? This afternoon the bed cover had water on it and in checking it was obvious that it dripped out of the plastic cover for the florescent light fixture above. It turns out we both had showers this morning one right after the other. I am going to pull that fixture and look behind it into the ceiling but I am sure it will not be a leak. Condensation can pour a bunch of water on you and air circulation is the key.
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ceiling, leak

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